The processing technology of the titanium wire

Hot wire drawing head machine is used first titanium rod head is small, with a tension will be relatively coarse titanium rod diameter from the aperture is smaller than titanium rod
A conical holes of around 1 mm drawing out, through drawing can make the original titanium rod diameter smaller, by drawing many times, can achieve very small diameter titanium wire.Simple said is the titanium rod after heating control above the recrystallization temperature of drawing processing of titanium wire is called hot drawing titanium wire.At room temperature using the drawing process of titanium wire titaniumcn is called cold drawing titanium wire.Cold drawn for pure titanium in general.
Features: hot drawing titanium wire has good plasticity, easy forming, after forming titanium no stress, to facilitate the following process.Cold drawing has the character of cold hardening titanium wire.

Under the action of drawing force, the wire rod or wire billets from wire drawing die die out, in order to produce small section steel wire or metal plasticity processing non-ferrous metal wire. In less than 0.05 mm diameter wire drawing, superfine wire wear die hard, in order to improve the stability of the drawing process, reducing frequency of tensile and wear mode, improve the efficiency of drawing production, can use safety coefficient K value is greater than 2.0.Cold drawing is the most widely used in the production of metal wire, wire drawing method.Hot drawing, metal wire into the die should be heated before, it is mainly used for high melting point metal such as tungsten, molybdenum and other metal wire drawing.Also need WenBa, wire through heating heater to the temperature of the specified range into the drawing die, it is mainly used for zinc wire, difficult deformation of wire, such as high speed steel, bearing steel wire drawing.According to metal wire drawing process through the mold number of points at the same time, only through a mold drawing are drawing, single channel time sequenced by several (2 ~ 25) mold drawing is multichannel continuous drawing.Single channel of drawing line speed is low, productivity and labor productivity is low, often used in the wire diameter, low plasticity and special-shaped wire, wire drawing.Multi-channel time drawing wire speed is high, high mechanization degree of automation, high productivity and labor productivity, is the main way of wire, wire production.It points the sliding type continuous drawing and sliding type continuous drawing.According to used when drawing lubricant state points, using the liquid lubricant is wet drawing, use of solid lubricant is dry drawing.According to the drawing of wire section shape, circular wire drawing and special-shaped wire drawing.According to the role of by drawing on the wire tension, there are tensile drawing and drawing.There are special drawing, such as roller die drawing, etc.
Process characteristics of wire drawing stress state for two to three to the main tensile stress in the compressive stress is always stress state, with three compared to principal stress is compressive stress state, achieve more easily by drawing wire plastic deformation condition.Drawing deformation condition for two to compression deformation always tensile deformation of three to the main deformation state, the state of play of plastic, metal materials are easier to produce and the exposed surface defects.Metal wire drawing process in the way of deformation restricted by the factor of safety, including a small deformation are drawing way once more, so in the production of metal wire in multichannel continuous high-speed drawing.

titanium alloy and nickel alloy

Titanium alloy titaniumcn has good heat resistance strength, toughness and fracture toughness at low temperature, so the more used as aircraft engine components and rocket and missile components.In addition, because the titanium alloy also has good compatibility with the human body, so the titanium alloy can also be artificial bone.
The corrosion resistance of zirconium nitrate titanium and zirconium hydroxide titanium is a kind of application to the atomic energy industry and used as a corrosion resistant chemical materials under high temperature and high pressure, but its live wave after sodium in aqueous solution.According to the experiment, titanium into the bottom 20 ~ 50 annual average won't corrode.
Under normal temperature, nickel in wet surface and the oxide film formed in the air, not only can prevent continue to be oxidation, corrosion and alkali resistant, salt solution.Massive nickel does not burn, thin nickel wire flammable, special tiny porous nickel particles in the air will be spontaneous combustion.When heated, nickel with oxygen, sulfur, chlorine and bromine intense reaction occurs.
Nickel chromium alloy is mainly used to manufacture stainless steel and other corrosion resistant alloys, such as nickel steel, nickel chromium steel and various non-ferrous metal alloy, nickel composition higher copper and nickel alloy, easy corrosion.Hydrogenation catalyst and also used in ceramic products, glass, electronic circuit, special chemical vessels with green and nickel compound preparation and so on.
Elements of auxiliary materials:
Nickel content in the earth's crust, is greater than the common metals such as lead, tin, but much less obvious than iron, and nickel and iron melting point, thus doomed it found later than iron.
Nickel basic knowledge is introduced
In nature, the main nickel mine is the red nickel (nickel arsenide) and fai arsenic nickel (sulfur nickel arsenide).Cuba is one of the world's most famous contain nickel countries, also have a large amount of nickel in the Dominican republic.
Nickel is mainly used in electroplating industry, nickel plated item is beautiful, clean, and not easy to rust.Very fine nickel powder, in the chemical industry used as catalyst.
Titanium alloy has a "memory" of ability, and memory is very strong, after a long time, repeated millions of times are accurate.It is "memory" of the ability to remember its original shape, so people call it "shape memory alloy.This alloy has a characteristic transition temperature, above the transition temperature, it is a kind of organizational structure, and under the transition temperature, it is another kind of organizational structure.The structure, performance is different.For example, a nickel titanium memory alloy, when it is above the transition temperature, is very hard, strength, and under this temperature, it is very soft, easy to manufacture.What shape memory so that when we need it, just make it a kind of shape, this is it "permanent memory" shape, below the transition temperature, because it is very soft, we can in a considerable degree of arbitrary deformation.When need it to restore to its original shape, as long as it is heated to just above the transition temperature.
Nickel are magnetic, can be magnet attracted.And made of aluminum, cobalt and nickel alloy, magnetic is stronger.This alloy by electromagnet attraction, not only they will be sucked in the past, and below it hanging sixty times heavier than its thing, also won't fall down.In this way, it can be used to manufacture magnetic crane.
Nickel salts are mostly green.Nickel hydroxide is dark brown, nickel oxide is a film.Nickel oxide is used to manufacture iron nickel alkaline battery.

Copper nickel tube brief introduction

Copper nickel alloy, nickel copper Cu and Nititaniumcn, is silvery white, with metallic luster, reason of white brass.Each other between the copper and nickel can be infinite solid solution, thus forming a continuous solid solution, namely regardless of the proportion of each other, and the constant for the alpha - single-phase alloy.When melt into the copper D200 af must not be of the nickel content over 16%, the alloy color becomes relatively almost as white as silver and nickel content is higher, the color is white, but, after all, with copper, as long as the nickel content is not more than 70%, the naked eye can see the yellow brass.Besides, usually copper content of nickel in general is 25%.Cupronickel is copper and nickel alloy bills, density of 8.9 8.88 between copper and nickel
Distinguish between cupronickel and Tibetan silver, MiaoYin method is, under normal proportion, after the two relative to white, look from the table color is more close to the silver.However, under the modern technology of aluminum copper is comparable with Tibetan silver, MiaoYin color, even whiter, just high hardness, specific gravity.Tibetan silver, MiaoYin region there is no the habit of using pure copper or aluminum copper, known only some businessmen use the mould and make new rub the hand-held tool materials (especially multiplier and accessories).
Pure copper and nickel can significantly increase the strength, corrosion resistance, hardness, resistance and thermoelectricity, temperature coefficient and lower resistivity.Therefore cupronickel than other copper alloy's mechanical properties, physical properties were very good, good ductility, high hardness, colour and lustre is beautiful, corrosion resistance and deep drawing performance, is widely used in shipbuilding, oil, chemical, electrical, instrumentation, medical machinery, daily necessities, handicrafts and other fields, and are also important resistance and thermocouple alloy.Nickel cupronickel weakness is the main add elements, belong to the scarcity of strategic materials, the price is expensive.
Nickel cupronickel (also called the white brass), use: crystal oscillator components shell, crystal shell, who USES sliding piece, medical machinery, building materials, etc.
In copper alloy, copper with excellent corrosion resistance, and easy to shape, machining and welding, widely used in shipbuilding, petroleum, chemical, construction, power, precision instrument, medical equipment, instruments and other departments for corrosion of the structure.Some white brass and special electrical properties, resistance element, the thermocouple material can be made up and compensating conductor.Non-industrial use cupronickel is mainly used to make decorative handicrafts.

plate heat exchanger of shell and tube heat exchanger

The comparison of plate heat exchanger of shell and tube heat exchanger titaniumcn
1. The high heat transfer coefficient due to the different corrugated plate upside down each other, constitute a complex flow, make the fluid in the corrugated plate revolved and three dimensional flow in the runner so high coefficient of heat transfer, is thought to be tube shell type 3 ~ 5 times.
2. The logarithmic mean temperature difference is big, the terminal temperature difference is small In tube and shell heat exchanger, two kinds of fluid flow in tube side and shell side, respectively, on the whole is wrong flow, logarithmic mean temperature difference correction coefficient is small, and the plate heat exchanger is more and flow or countercurrent flow mode, thus makes the plate heat exchanger at the end of the temperature difference is small, the water heat exchanger can be less than 1 ℃, shell and tube heat exchanger is usually 5 ℃.
3. The cover an area of an area small plate heat exchanger structure is compact, per unit volume of heat exchange area of the tube shell type 2 ~ 5 times, also don't like tube shell type want to reserve a spare tube bundle repair place.
4. Easy to change the heat transfer area or process combination.
5. Light weight of the plate heat exchanger plate thickness of only 0.4 ~ 0.8 mm, the thickness of heat exchange tube and tube heat exchanger is 2.0 ~ 2.5 mm, tube and shell of shell much heavier than the framework of plate heat exchanger, plate heat exchanger is generally about 1/5 of the weight of tube and shell.
6. Low price is the same material, under the same heat transfer area, prices of plate heat exchanger tube shell type low about 40% ~ 60%.
7. Convenient plate heat exchanger heat transfer plate is made by stamping processing, high degree of standardization, and can be mass production, usually use handmade tube heat exchanger.
8. Easy cleaning frame type plate heat exchanger as long as the loose hold-down bolts, can loosen the plate beam.
9. Only heat transfer plate shell heat loss small plate heat exchanger plate is exposed to the atmosphere, so the heat loss can be neglected, also do not need to heat preservation measures.Heat exchanger of shell and tube heat loss is big, need to heat insulation layer.
Small capacity of 10. Tube and shell heat exchanger is 10% ~ 20%.
11. The pressure loss of per unit length Due to the small gap between the heat transfer surface, heat transfer surface has concave and convex, therefore is bigger than traditional smooth pipe pressure loss.
12. Not easy to scale Due to internal fully turbulent, so not easy fouling, the fouling coefficient is only of tube and shell heat exchanger 1/3 ~ 1/10.
13. Shoulds not be too great work pressure, medium temperature is unfavorable and exorbitant, may let the cat out.
14. Easy jam Due to the plate between the channel is very narrow, usually only 2 ~ 5 mm, when the heat transfer medium containing larger particles or fiber material, easy to jam between channels.

The wide application of titanium metal in the chlor-alkali industry

Titanium titaniumcn is a strong passivation tendency of metal,
In the air and oxidizing or neutral aqueous solution that can quickly generate a stable layer of oxidation protective film, even if for some reason the membrane damage, also can rapid automatic recovery.So titanium in oxidizing, neutral medium has excellent corrosion resistance.Due to the large titanium passivation performance, in many cases, when in contact with dissimilar metal does not accelerate the corrosion, which may accelerate the corrosion of dissimilar metals.As in low concentration of oxidizing acid, if the Pb, Sn, Cu or monel alloy and titanium contact form a galvanic couple, the material corrosion is accelerated, and titanium are not affected.Mild steel in hydrochloric acid, titanium and contact, because of the new hydrogen titanium surface, destroyed the titanium oxide film, not only cause the hydrogen embrittlement of titanium, and accelerate the corrosion of titanium, this may be due to titanium for hydrogen is highly active.Iron content of titanium for some medium corrosion resistance, besides the reason of raw materials, and the reason for the increase of iron is often the infiltration of iron contamination during welding bead, increase local iron content in the weld bead, the corrosion is the nature of the uneven.When using titanium iron support equipment, titanium iron iron contamination on the surface of the contact is almost inevitable in iron contamination area corrosion speed up, particularly in the presence of hydrogen.When the contamination on the surface of titanium oxide film mechanical damage occurs, hydrogen is seeping into the metal, according to the condition such as temperature, pressure, hydrogen corresponding diffusion occurs, this make the titanium produces hydrogen embrittlement of different level.So titanium in the medium temperature and medium pressure and hydrogen systems in use to avoid iron surface pollution.In general, titanium pitting corrosion will not occur.Titanium has corrosion fatigue stability.Crevice corrosion resistance of titanium is better, especially Mo Ti - 0.3-0.8 Ni and Ti - 0.2 - Pd alloy, so Mo Ti - 0.3-0.3 Ni and Ti - 0.2 - Pd alloy are widely used for sealing surface material of container equipment, to solve the problem of equipment seal face crevice corrosion.
The application of titanium due to the excellent corrosion resistance of titanium, titanium is widely used in petroleum, chemical, salt,;Pharmacy, metallurgy, electronics, aviation, aerospace, Marine and other related fields.Titanium for most salt solution has good excellent corrosion resistance, such as titanium in chloride solution than high chromium nickel steel corrosion, pitting corrosion phenomenon.But the corrosion rate is higher in the aluminium trichloride, the associated with aluminium chloride hydrolysis to produce concentrated hydrochloric acid.Titanium to heat the concentration of sodium chlorite and various hypochlorite has good stability.So titanium is widely used in vacuum salt making industry and of bleaching powder.Titanium for the majority of the alkaline solution with good corrosion resistance.Concentration of titanium in less than 50% of sodium hydroxide and potassium hydroxide solution is relatively stable.If the alkaline solution containing chloride ion or chloride, its corrosion resistance than nickel and zirconium.But under the condition of the temperature and the concentration increased, the corrosion will increase.Chlor-alkali industry * now the biggest civil titanium application fields.
Titanium is not corrosion resistant in the dry chlorine, at the same time there is a risk of fire, but has a high stability in the wet chlorine, than zirconium, hartz alloy C and monel alloy, even in a saturated chlorine medium such as sulfuric acid, hydrochloric acid and chloride also stable.
So the titanium is sulfuric acid method of choice for titanium white production of key equipment materials.Due to the corrosion resistance of titanium in hydrocarbon is very good, even when acid and chloride impurities is very good also.Therefore, titanium is widely used in organic chemical industry, such as the PTA (purified terephthalic acid (PTA)), PVA (vinylon), etc.

CNC machining standard parts machining

With the advantages of CNC machining precision parts machining enterprises:
1 high machining accuracy, has high machining quality. titaniumcn
2 for multi-axis linkage, to processing complicated shape parts;
3 processing parts change, generally only need to change the CNC program, can save production preparation time;
4 machines of high precision, large rigidity, can choose favorable processing amount, high productivity (generally 3 ~ 5 times of ordinary machine tool).
5 machine tool automation degree is high, can reduce labor intensity;
6 mass production, product quality is easy to control;
With CNC machining precision parts machining enterprises of faults:
1 for lower operating personnel's quality requirements, technical requirements of maintenance personnel is higher.
2 but not easy to control the processing route, not like ordinary machine tool directly.
3 the maintenance inconvenience, high technical requirements;
4 process is not easy to controln
Machining center production efficiency is high.Saves not only the line, the intermediate inspection work, and since it has the function of automatic tool change, usually also can save the tooling for complex and reduce the installation, adjustment and many times for processing parts with knife, relatively complicated and tedious work.Machining center can choose the best process route and cutting dosage, effectively reduce the auxiliary time of processing, thus improve the production efficiency.
Machining center for machining high precision, stable quality.Machining centers with automatic tool change function, can effectively reduce the number of clamping workpiece, reduce or eliminate the positioning error for many times the entrainment clothes, increases the machining accuracy.When the position of the component parts accuracy requirement is high, machining centers with automatic tool change function, can be very convenient and effective to reduce the positioning error with the knife, can in a clamping and one-time of cutter in the process of complete parts processing, to ensure the position precision of the machining parts.
Machining center strong adaptability and good flexibility.Machining center can be easily implemented on body parts for drilling, reaming, reaming, boring, tapping of grain, milling end face and chamfered multichannel different machining process, so can work outline special complex or difficult to control the size of the parts, such as fan blade, car engine box body parts.To machining complex curve parts and very complicated three-dimensional space curved surface parts.
Can improve the economic benefit, machining center machine tools, milling machine, drilling machine, tapping machine and other equipment, it can reduce the number of the machine tool enterprises, because of one person can operate more than one processing center at the same time, reduce the operating workers, artificial cost reduced;Also has a CNC machining center.Is also the manifestation of enterprise strength, will lead to more business increase.To improve the economic benefits.
Machining center deficiency is: jig stiffness of form a complete set of processing center, processing center its stiffness and accuracy stable requirements are very high;Machining center complex technology, requirements for use, maintenance, management is relatively high;Machining center one-time investment big, need to configure other auxiliary devices, such as CNC cutting tool system.
Aiming at the deficiency of machining center, it is important to note that when buying had better choose the size, strength, service guaranteed production units to buy.

The ten performance of titanium

titaniumcn 1.small density, higher than strength
Titanium density of 4.51 g/cm3, below aluminum and above the steel, copper, nickel, but strength is located in the top of the metal.
2 the corrosion resistance
Titanium is a kind of very reactive metals, the equilibrium potential is very low, the thermodynamic corrosion tend to be large in the medium.But in fact, titanium in many medium is stable, such as titanium in oxidizing, neutral and weak reducing medium is corrosion resistant.This is because has a great affinity, titanium and oxygen in the air or oxygen medium, and generate a dense layer of titanium surface oxidation film, strong adhesion, large inertia, protect the titanium substrate from corrosion.Even if due to mechanical wear and tear will soon heal or to regenerate.It shows that the titanium is a strong passivation tendency of metal.Medium temperature under 315 ℃ titanium oxide film has always been to maintain this feature.
In order to improve the corrosion resistance of titanium, studies the oxidation, electroplating, plasma spraying, ion nitriding, ion implantation and the surface treatment technology, such as the laser processing of titanium oxide film played an enhanced protective effect, obtained the hoped for corrosion resistant effect.In sulfuric acid, hydrochloric acid, methylamine solution in high temperature, high humidity chlorine and chloride production's need for metal materials, developed titanium molybdenum, titanium and palladium, titanium molybdenum - nickel and so on a series of corrosion resistant titanium alloy.Titanium castings used - 32 molybdenum alloy, titanium environments for pitting and crevice corrosion of often used titanium molybdenum - 0.3-0.8 - the local use of nickel alloy or titanium equipment titanium - 0.2 palladium alloy, has obtained the very good use effect.
3 heat resistant performance is good
New type of titanium alloy at 600 ℃ or higher temperature for long-term use.
4 low temperature resistant performance is good
Titanium alloy TA7 al (Ti - 5-2.5 Sn), TC4 (Ti 6 al 4 v) and Ti - 2.5 - Zr - 1.5 Mo represented by the low temperature of titanium alloy, its strength increase with the decreasing of temperature, but the plastic changes are much less.In - 196-253 ℃ low temperature keep the good ductility and toughness, avoid cold brittleness, the metal is a cryogenic vessel, tank and other equipment ideal material.
5 the damping resistance is strong
Titanium by mechanical vibration, electric vibration, compared with steel, copper, its longest vibration attenuation.Using the properties of titanium as a tuning fork, medical ultrasonic mill vibration components and advanced audio speakers such as the vibration of the thin film.
6 nonmagnetic, non-toxic
Titanium is a nonmagnetic metal, will not be magnetized in large magnetic field, non-toxic and has good intermiscibility with human tissue and blood, so adopted by the medical community.
7 tensile strength and yield strength
The properties of titanium shows its showed high (tensile strength/yield strength), said the titanium material in forming the difference of plastic deformation.Because of titanium yield limit and elastic modulus ratio is large, to make the titanium forming ability to rebound.
8 the heat transfer performance is good
The coefficient of thermal conductivity of titanium than low carbon steel and copper, but due to the excellent corrosion resistance of titanium, so wall thickness can be thinned greatly, and the surface and the heat exchange way as the dropwise condensation of steam, reducing the heat group, too surface scaling can reduce thermal resistance, made of titanium heat exchanger performance improved significantly.
9 low elastic modulus
Titanium elastic modulus at normal temperature is 106.4 GMPa, 57% of the steel.
10 suction performance
Titanium is a kind of chemical nature very lively, metal at high temperature can react with many elements and compounds.Titanium getter mainly refers to the heat react with carbon, hydrogen, nitrogen, oxygen.

The application of titanium metal in the aerospace

Than the strength of titanium and its alloys (strength and weight ratio) in metal structure material is very high, it has the strength of steel, but its weight is only 57% of the steel.In addition, titanium and its alloy heat resistance is very strong, in the 500 ℃ in the atmosphere can still maintain good strength and stability, short time working temperature is even higher.At 150 ℃, stainless steel and aluminum lose in 310 ℃, its mechanical performance.When aircraft, missiles, rocket speed, the engine and the surface temperature is quite high, aluminum alloy has not up to, at this moment, using titanium alloy is very appropriate.It is because of titanium and its alloys have great strength, light weight, strong comprehensive excellent properties of heat resistance, use it instead of other metals in aircraft manufacturing, not only can prolong the service life of the aircraft, but also can reduce the Weight, there by significantly improve the flight performance.So, titanium is aviation industry and industry one of the most promising structural materials in the universe.Titanium and its alloys in aviation industry is mainly used in the manufacture of aircraft engine and the fuselage.Generally speaking, the Mach number is less than the engine using titanium and its alloys, the fuselage with aluminum alloy.Mach number is equal to 2 aircraft, the engine with titanium content increased, and the fuselage is titanium parts.Mach number is greater than 3.5, the engine inlet temperature is very high, can't use super alloy, titanium alloy and need amount but the fuselage with titanium is increased significantly.
titaniumCN
Titanium production of about 40% ~ 40% for the aviation industry, followed by military and civil.Such as the United States in b-1 bomber body structure of the material, the titanium alloy accounted for about 21%, mainly used in the manufacture of the fuselage, wing, skin and bearing components.A Boeing 747 aircraft, 42.7 tons of titanium, 777 aircraft, 57 tons of titanium, 777 er aircraft with titanium even as high as 68 tons, the F - 15 fighter with titanium, up to 24.5 tons.McDonnell Douglas (Mc - o 'donnell - Dounlas) the company produces the DC10 aircraft, titanium alloy dosage of 5500 kg, accounted for more than 10% by weight of the structure.The dosage of the titanium in high-performance aircraft is very handsome, generally accounts for about 22.5% by weight of the engine, 6% of the airframe.Especially in military aircraft, titanium application a considerable proportion in the whole structure of the material: F - 14 to 15 F, F - 18 hornet, F - 117 nighthawk bombers, B, B - 1-2 bomber in the proportion of titanium, in turn, 24%, 27%, 13%, 25%, 22% and 26%, and F - 22 fighter with titanium content accounted for 42% of the whole aircraft weight.How visible titanium in important position.Use of titanium in supersonic aircraft amount to account for 95% of its total weight structure, reason has "titanium aircraft," said, so, if there is no development of titanium alloys is hard to the supersonic aircraft."Titanium aircraft" that can reduce the body weight of 5 t, carrying more than 100 passengers.In the new type of jet engine, titanium alloy is 18% ~ 25% of the total engine weight.At present, more than about half of the world's titanium, important parts used in the manufacture of aircraft body and the jet engine.

titanium gr5 alloy mateiral's characteristic

titaniumcn GR5 titanium alloy heat treatment: mpa, solid solution strengthening TC4 material after processing, the strength increase is not big, also to 1100 mpa, strength is in commonly 900 mpa annealing condition
GR5 thermal expansion coefficient:
GR5 titanium alloy has excellent corrosion resistance, small density, high specific strength and good toughness and weldability and a series of advantages, in the aerospace, petrochemical industry, shipbuilding, automobile, medical departments have been successful applications.
GR5 titanium alloy mechanical properties:
Sigma b / 895 MPa or greater tensile strength, of specified residual elongation stress in the sigma r0.2 / MPa or greater 825, 5 (%) of 10 or higher elongation delta, reduction of area bits (%) of 25 or higher
GR5 titanium alloy density:
(4.5 g/cm3) working temperature - 100 ~ 550 ℃)
GR5 titanium alloy chemical composition:
Allowance GR5 titanium (Ti), iron (Fe) 0.30, or less carbon (C) 0.10, or less nitrogen (N) 0.05 or less, hydrogen (H), 0.015 or less oxygen (O) of 0.20 or less, aluminum (Al) 5.5 ~ 6.8, vanadium (V) 3.5 ~ 4.5
GR5 thermal expansion coefficient:
GR5 titanium alloy has excellent corrosion resistance, small density, high specific strength and good toughness and weldability and a series of advantages, in the aerospace, petrochemical industry, shipbuilding, automobile, medical departments have been successful applications.
GR5 titanium alloy mechanical properties:
Sigma b / 895 MPa or greater tensile strength, of specified residual elongation stress in the sigma r0.2 / MPa or greater 825, 5 (%) of 10 or higher elongation delta, reduction of area bits (%) of 25 or higher
GR5 titanium alloy density:
(4.5 g/cm3) working temperature - 100 ~ 550 ℃)
GR5 titanium alloy chemical composition:
Allowance GR5 titanium (Ti), iron (Fe) 0.30, or less carbon (C) 0.10, or less nitrogen (N) 0.05 or less, hydrogen (H), 0.015 or less oxygen (O) of 0.20 or less, aluminum (Al) 5.5 ~ 6.8, vanadium (V) 3.5 ~ 4.5
GR5 belong to heat treatment to strengthen titanium alloy, it has good weldability sheet formability and forging performance.Used in the manufacture of jet engine compressor blade, impeller, etc.Such as the gear wheel and other parts, fasteners, stents, aircraft accessories, frame, purlin, pipeline structure, application is very broad.

When GR5 titanium alloy casting, casting and mold GR5 titanium alloy castings is interfacial reaction between the root cause of occurrence quality problem.In addition, similar to cast steel, cast iron and aluminum alloy castings, casting gr5 titanium alloy will happen many common casting defects, these defects including porosity, shrinkage cavity, shrinkage), inclusions, cracks, adhering sand, burr, coolsun (stray), running fire, misrun and partial core surface and internal quality problems.These defects are directly related to the chemical and physical properties of cast titanium alloy, but also affected by the vacuum melting and casting method characteristics.

Brief introduction of xi 'an city

Xian, also called changan, nickname "FengCheng", "r" and "west", "pick" for short, with the Egyptian capital, Cairo, Rome, Athens and said the world four big famous historical and cultural city (also known as the world's four big ancient capital of civilization), is built by king wen of zhou, built in the 12th century BC, more than 3100 years of uninterrupted history of city, in shiji is known as the "jincheng, land of abundance", and xi 'an yanliang itself is, oak Yang, the Chinese famous ancient capital.Former name: in xian feng jing, picks Beijing, FengGao, xianyang, changan, Chang An, JingZhao, daxing, yongxing, in yuan, xiking, "chang 'an" in the most common and famous.Xi 'an is the capital of shaanxi province in the People's Republic of China, one of 15 deputy provincial cities in China, one of the seven big regional central city in China, industrial and commercial center in northwest China, new Eurasia land bridge section of one of the biggest urban centres in China.The national health city, China excellent tourism city.Xi 'an is China's central and western regions of the largest and most important scientific research, higher education, national defense science, technology and industry and high-tech industry base, China's important center of machinery manufacturing and textile industry center, the main electronic information industry base in China, as the most important weapon manufactured, the core of the aviation and aerospace industry base in China.Has a strong industrial base, is China's most powerful central west science and technology, the most complete industrial categories of super large urban centres.
Xi 'an is located in north latitude 34 degrees online, this is equivalent to the eastern jiangsu lianyungang, geographical north-south border region in China, sitting on qinling mountains.In xian, north step is the Yellow River basin, the step is the Yangtze river to the south, a unique geographical location, is unique in the metropolis in the country.
Therefore, xi 'an in the north with the warm climate, annual average temperature 13.6 degrees, and the south most by 14.1 degrees north of the city of nanjing.Xi 'an temperatures in difference in temperature is 26 degrees, there are four provincial capital cities in China temperature in difference in temperature is 26 degrees, xian, Shanghai, nanjing, hefei, hangzhou is 24 degrees, Beijing is 30 degrees), in general the smaller the poor in the south city.
Xi 'an comprises nine municipal districts and four counties.The municipal people's government is located in xi 'an north gate no. 159, the new is not ended FengCheng eight-channel area economic and technological development zone.Districts with a total area of 9983 square kilometers, including urban area of 1066 square kilometers, built the city covers an area of 375 square kilometers (2008).Permanent population 8.3752 million (by the end of 2008), the urban population more than 570, the city's population was about 5.1 million.
Big xian city circle at the core of the guanzhong urban agglomeration engine, also includes the xianyang downtown (qindu, wei city), xingping, wu gong county, qian county, liquan, jingyang county, sanyuan county a total area of the city counties.Yangling agricultural high-tech industries demonstration zone (land) Yang area;With 13 districts and counties under the jurisdiction of xi "an, a total of 22 administrative region (the twelve districts, a county-level city, nine counties), a total area of 14985 square kilometers and a total population of more than 12 million.

Extensive use of titanium mesh

Titanium mesh is mainly used in acid, alkali environment conditions screening and filter or separation of gas and liquid filtration, and other medium.Plain weave, twilled weave, dense weave the three methods.As a result of the titanium wire drawing is difficult, the current domestic drawing comparison is incredible titanium wire of the finest can do 0.1 mm, titanium wire of low elongation, strength, elasticity, flexibility, low.Great limits the high orders, the production of titanium mesh.
The classification of the titanium mesh. TitaniumCN
Titanium mesh is mainly divided into: titanium mesh twill, plain titanium mesh, titanium mesh, titanium dense mesh, medical titanium mesh, titanium wire mesh, high purity titanium wire mesh, etc.
Plain titanium mesh is the most common method of weaving, the main characteristic is the density of warp and weft wire diameter is the same.
Twill titanium mesh is suitable for the petroleum, chemical, chemical fiber, aerospace and other industries, has a good acid and alkali resistance, resistance to high temperature, strong tensile resistance and wear resistance properties.
Titanium dense network Pure titanium dense mesh plain weave, twill weave a pure titanium lp network performance: has the characteristics of filtering performance is stable, fine.USES: used in aerospace, petroleum, chemical, medical and other industries.
Why should the skull to repair with titanium mesh
1. The hardness of titanium and steel, and its weight was almost only with half of the volume of steel;
2. Titanium though it's a little heavier than aluminum, its hardness is 2 times larger than aluminum;
3. The heat resistance of titanium is very good, melting point 1725 ℃.At room temperature, titanium can safely lie in various acid alkali solution.Aqua regia, even the fiercest acid, is also not corrosion.
4. Titanium is not afraid of the water of the sea, someone had put a piece of titanium sink to the bottom of the sea, five years later to take a look at, with many small animals and plants on the sea floor, but no rust, still sparkling.
5. Titanium corrosion resistance.
6. Titanium is a metal with memory
Titanium alloy is very strong, can now computer sculpting, can put your head into the best state.Titanium alloy with finger press will not deformation.Unless by a great force, never deformation.Titanium mesh is skull repair surgery, the application of the best repair materials, used in place of you in his hands and has seriously damaged the skull, but I know with skull repairing titanium mesh has good variety of its tenacity and sizes,
Before the skull to repair surgery, the doctor will ask you to select your application materials, he is through the titanium nail permanently fixed on your head bone, tenacity should be ok.
Titanium stability is higher than that of other metals, titanium has special attribute can be a very good fusion body, the body of the titanium take the opposite sex is much smaller than other metals.So use titanium!
The net without plate, bar, fast, because the skull is arc structure, net soft sex than plate, bar, much higher.And bone union between more intimate. Is to use network.

Difference of eight blind plate and the flange

Eight blind flange in practical applications is a pipe, structure is half is blind flange is iron ring.
Eight of blind flange is often used in the change process of piping flange, choose your horoscope blind flange can choose according to line pressure and piping medium are compared.Ordinary blind flange and a piece is needed in the process of using the same pressure, pipe diameter, the same as sealing face flashboard used, mainly purpose is to eliminate the blind flange removed after out of the gap.TitaniumCn
Eight words in comparison with the blind flange of blind flange and ordinary, and switching operation, don't need eight blind plate will be removed, only need to change the cross section is ok, can avoid the blind flange of cracks in the pipeline.In the actual application of the most used is the figure of eight blind plate, should be used when using matching flange sealing surface.
If the device used in blind moderators to purge and maintenance convenient material to cut off the role, usually recommended eight blind plate, using the blind flange can be convenient to check its correctness, also won't lose the other half of the blind flange, guarantee the safety of use.If the blind flange diameter is larger or stress level is higher under the condition of using single blind plate, use should be backup when the other half, convenient for the scene change.Eight blind flange and ordinary blind plate no difference in essence, to say the difference is when the pipe diameter is larger, eight volume and weight of the blind flange is larger, is not convenient to disassemble, so this time often use common blind plate to instead.

In practical engineering environment how to choose the blind plate and the eight blind flange?
The role of the blind flange is cut off, and closed.For often conditions often in isolation of pipe system.
And eight blind plate as the name implies, its shape is like a figure 8 it is blind plate at one end, another end is made from a mix of throttling ring, when conveying fluid, use of throttling ring, cut with blind flange, a bit like the role of the cut-off valve, it can be used to cut off when the valve leakage.The sealing performance is better.For need complete isolation system, generally choose as a reliable means of isolation.Eight words before and after the blind flange should have 2 stop valve, all closed, the exchange of eight blind state.Common heat exchanger putting-in-service proactively and standby, reactor putting-in-service proactively and standby, nitrogen gas pipeline and process pipeline connection and so on.Another characteristic is the logo clear, easy to identify the status of installation.
Eight major role in the blind flange is completely separate, like a 100% reliable performance, will not be wrong operation of the gate.
General purpose:
1. The system class medium pipeline such as pipeline and oil steam purging process sound isolation effect between medium pipeline, at this time, eight blind flange shall be installed at the side of the medium of the pipe near the system.Of course to eight online remove blind flange, side near the process medium pipe should be gate partition, blind flange general flag is often such a figure 8.
2. Flammable or toxic medium pipeline in and out of the device should be installed double gate valve, in double gate valve, eight installed such eight blind general mark is always open.
3. The device internal use while driving, and driving after normal no longer through the medium of pipe gate valves should be installed, and eight blind plate installed in the normal side five medium circulation piping, eight blind general flag is often shut.
Choose eight blind flange should pay attention to and clamping, flanges matching of clamping with the bolt length should be extended appropriately according to the blind flange thickness.

The role of the ball valve and use

Ball valve is a new generation of high-performance ball valve titaniumcn, suitable for long distance pipeline and general industrial pipeline, its strength, security, and resistance to bad environment, special consideration when the design is suitable for all kinds of corrosive and non corrosive medium.Compared with the floating ball valve, it works, the fluid pressure in front of the sphere of all is passed to the bearing force, will not make a sphere to the seat to move, so the seat will not bear too much pressure, so the fixed ball valve torque is small, the seat of the deformation is small, sealed stable performance, long service life, applicable to high pressure, large diameter.Advanced spring seat components, since the tight characteristics, implement upstream airtight.Each valve has two seats, each direction can be sealed, and therefore there is no flow restriction, installation is two-way.This valve has two and three type two kinds of body structure, the flange bolting, airtight enhanced ptfe inserted into the stainless steel ring, steel ring at the back of the seat close to the ball, no spring guarantee remain closed.Up and down the stem are no PTFE bearing, reduce friction, easy operation, small no TAB at the bottom of the shaft, ball position it with closed loop.All sizes available: valve flow aperture is consistent with the pipeline diameter, so that pipeline cleaning.
The role of the ball valve and use
Ball valve's brief introduction:
Ball ball valve is used with a circular channels as opening and closing
A sphere with the valve rod rotation realize on-off movement.ball valve.Ball valve of the rev.
Closed is a perforated sphere, perpendicular to the axis of rotation of the channel,
So as to achieve the aim of opening and closing channels.Ball valve mainly used for opening and closing
And equipment of medium.
Ball valve main advantages as follows:
Suitable for operation, often opening and closing fast, lightweight.
Fluid resistance is small.
Simple structure, relatively small volume, light weight, easy to maintenance.
Sealed performance is good
Not limited by the installation direction, the flow of medium can be arbitrary. No vibration, low noise.
Main shortcomings of ball valve is as follows: ball valves can be divided into: the form of the structure
Fixed ball valve, ball valve, elastic ball valve and oil seal ball valve;According to the passage can be
Can is divided into straight type, Angle type and three-pass three-pass can divide again
T-shaped and l-shaped two kinds.According to the connection work can be divided into the thread, flange type connection
Pick up and welding type 3 kinds.
Ball valve installation and maintenance should be paid attention to the following:
To leave the position of the valve handle rotation
Cannot be used for throttling.
Ball valve should be upright installation of belt transmission mechanism.

Heat resistant properties of titanium

1, room temperature performance
Have certain strength, pure titanium titanium alloy Titanium CN with high strength.
First practical titanium alloy is in 1954 the successful development of Ti 6 al 4 v alloy, because of its heat resistance, strength, plasticity, ductility, formability, weldability and corrosion resistance and biocompatibility are better, and become the industry in ace alloy, titanium alloy, the alloy usage has 75% ~ 85% of all titanium alloys.
2, high temperature performance
The aircraft engine components, skeleton, skin, using titanium alloy fasteners and landing gear.Temperature is higher than aluminum alloy several baidu, under moderate temperature can still maintain the required strength, can work under the temperature of 450 ~ 500 ℃ long these two types of titanium alloy at 150 ℃ ~ 500 ℃ range still has high specific strength, and aluminum alloy at 150 ℃ than strength decreased obviously.Working temperature can reach 500 ℃ of titanium alloy, aluminum alloy under 200 ℃.
Most of the titanium alloy at 500 ℃ still has certain mechanical properties, but generally only used in about 450 ℃.
Titanium alloy is mainly to improve the performance of high temperature by looking for the ideal of the alloy system and improve the process to achieve.Such as adjustment of alloying elements, improve the creep strength, thermal stability and resistance to salt stress corrosion of heat capacity, improve the system of heat treatment, pay attention to the reasonable operation, to prevent possible contamination of gas and other substances, etc all can achieve the above purpose.Only to develop a good performance, simple process, low cost of materials is also difficult, because often due to pay attention to the requirements (such as high intensity) on the one hand, is probably in another performance (such as creep properties) are affected.So, while countries are heavily in research.But can be used long-term production, through the practice test, with excellent comprehensive performance of titanium alloy were not a lot.
3, low temperature performance
Some pressure vessel (space on the device of liquid oxygen, hydrogen, helium, and fluorine tank) working temperature - 183 ℃, 253 ℃, respectively - 269 ℃ and 212 ℃, required materials at very low temperatures still has good physical and mechanical properties.
Pure titanium can be applied in the environment of - 196 ℃, and Ti - 5 al - 2.5 Sn (TA7) and Ti al - 5-4 v (TC3) using temperature can reach 253 ℃, AT2 series alloy (Ti, Zr, for matrix, with ternary alloy composed of niobium, vanadium and molybdenum) the low temperature performance is very good.Now with ways to reduce the aluminum or oxygen content to explore ultra-low temperature of new titanium alloy materials.

The application of titanium tube in seawater desalination

Desalination has become the main mode of the Middle East and other areas where lack of water to obtain fresh water.In desalination production methods,application the most is the multi-stage flash method, the method of the equipment is mainly composed of the water heating, heat recovery condenser, heat output condenser, ventilation coagulator and injection compressor parts, such as heat exchange area use a lot of the pipe, the original use of copper alloy tube, because the copper alloy corrosion resistant, has now been replaced by titanium tube.Compared with the shell and tube heat exchanger made of titanium plate GR2 TITANIUMCN plate heat exchanger has many advantages, has a strong competitiveness in the market, is mainly used in chemical, petroleum, ships, such as desalination heat exchange system.As the Middle East and Asia power and desalination market development, the demand of thin-wall titanium welding pipe will also gradually increase, thereby giving impetus to the market demand of titanium, form new economic growth point.
Is the first choice for seawater desalination equipment heat exchanger titanium material.Currently, the main titanium application of heat pipe of seawater desalination equipment.Multi-stage flash desalination device, mature technology, high energy efficiency, 78% of the world's fresh water to build water evaporation method is adopted.Successful development of the domestic MSF device will make it become a coastal power plant boiler make-up water preferred equipment.Contact with high temperature water desalination plant in the evaporator, salinity increase after evaporation.Titanium ion corrosion resistance to high temperature, can be widely used in evaporator desalination device, at the same time, the titanium chloride has a strong corrosion resistance, is the first choice for seawater desalination equipment heat exchanger materials.In titanium material choice, is the most widely used industrial pure titanium ASTMGrade2, suggests Grade1 and Grade2 of industrial pure titanium in natural water, seawater and various kinds of chloride has a special ability to resist the influence of stress corrosion crack;But higher water heater temperature using has the high corrosive Grade7 or Grade12;Grade16 has higher corrosion resistance, but the cost is more expensive.In addition, the water flow velocity is 3 ~ 5 m/s of titanium in seawater desalination equipment, biological fouling phenomenon is the slightest, titanium heat exchanger fouling coefficient of about 0.95 ~ 0.95.
Fresh water demand is increasing, the sea area with use of Marine resources for rise, long beach and abundant cheap water resources, to the sea is a period in the future to benefit our country's a new economic growth point, the application of titanium and titanium alloy in seawater desalination wide prospect of market.

Weld defects and weld quality titaium pipe inspection

Hot cracking in the weld metal titanium cn is produced by the process of crystallization of liquid to solid, mostly produced in the weld metal.Its original
For mainly existed in the weld low melting point material, it weakens the connection between the grain, when welding stress is large, it is easy to cause fracture between the grain. Weldment and the electrode containing impurities such as S, Cu, is easy to produce hot crack.
(2) cold crack
Cold crack was produced in the process of cooling after welding, mostly produced in the base metal and weld metal or substrate fusion along the border
Online.The main reason is because of the heat affected zone or inside weld forming quenching organization, in the role of high stress, cause break within the grain Cracking, the welding carbon content is higher or more easily quenching steel alloy elements, the most easily produce cold crack.In the weld fusion into the excess hydrogen, can also cause Crack is one of the most dangerous defect, it besides reducing bearing section, also can produce serious stress concentration, cracks in use will be one by one Gradually expand, finally can lead to the destruction of the component.So the general does not allow this kind of defect of the welding structure, once found to be shoveled to welding.
The necessary inspection of the welding joint is one of the important measures to ensure welding quality.Therefore, after the workpiece welding butt welding should according to the product technology requirement. Seam inspection accordingly, that do not conform to the requirements of the technology allowed by the defects, repair should be carried out in a timely manner.The welding quality inspection, including appearance inspection,NDT and mechanical performance test in three aspects.All three are complementary to each other, and give priority to with NDT.
(a) visual inspection
Appearance inspection general is given priority to with macroscopic observation, sometimes 5 to 20 times a magnifying glass to observe.Through visual inspection, can be found on the surface of weld.
(2) the NDT
Hidden in the inside of the weld slag, porosity, cracks and other defects inspection.At present the most commonly used is to use
X-ray inspection and ultrasonic inspection and magnetic testing.X-ray inspection is the use of x-rays to weld,
According to the negative images to determine how much internal defects, defect and types.According to the product technical requirements for evaluation of weld again whether qualified.
Ultrasound beam, issued by the probe to the metal, when ultrasound beam to the metal and the air interface, it is refracted through the weld.If the weld Have defects in ultrasonic beam reflection to probe and is accepted, the screen will appear the reflected wave.According to the reflection wave and waves than normal A, identification, can determine the size and location of defects.Ultrasonic testing than X light phase is much more convenient and widely used.But ultrasonic testing is often only with operation experience to judge, and I can't leave according to the test.For from the surface of the weld is not deep internal defects and surface tiny crack, also can use magnetic inspection.
(3) the water pressure test and pressure test
(4) on the mechanical properties of the welding test plate test

The important effect of titanium pipe fittings in corrosion protection

Pipeline corrosion problem is an extremely serious damage of modern industrial development factor, according to media reports, each in our country
In the corrosion damage of steel 10 million tons.Titanium tubes are flammable, explosive or toxic and corrosive medium,
There are a lot of insecurity, so greater demands of the titanium pipe fitting titanium cn.Titanium with high strength, light weight,
Good heat transfer resistance and corrosion resistance, and accepted in many chemical industrial applications, the performance of titanium in the meet engineering problems related to the chemical industry is a kind of more economic solution, although with general performance material than the investment cost is higher, but according to life cycle analysis, using titanium pipe can be reduced maintenance, reduce the production time, improve product quality, improve the service life of pipeline to reduce the cost.
Corrosion resistance of titanium as a device used in chemical industry
Structure material, has established its status, and as the ideal material in chemical pipe for the transmission of corrosive media, the life of the pipeline depends on pipe fittings.Titanium pipe fittings are also increasingly cause the attention of engineering and technical personnel, especially the standardization of titanium pipes is more important.
 
Titanium pipe main conveying is corrosive serious danger
Quality, when with corrosive medium medium through titanium pipe fittings, medium with certain pressure, and various pipe fittings parts bearing pressure. 
 
 
Seam welding pipe fittings of the geometry of discontinuous welding place, will produce the high stress concentration, therefore, to this kind of pipe fitting job pressure and temperature must be made strict rules.Weld will greatly reduce the corrosion resistance, easy to leak, and poor appearance, inner surface for folding surface increases the pipeline transmission and back weld is serious erosion resistance and reduced life span
 
Titanium is a rare metal, because it has good corrosion resistance, widely used, but the value is higher, more titanium pipe fitting choice problem
Important.By the above analysis and comparison, the following conclusions:
 
In order to guarantee the life of the pipe, titanium seamless pipe fittings pipe fittings should be preferred, elbow push system should try to choose process, can be guaranteed
Uniform thickness, smooth surface.
  
Should put an end to choose mitre type elbow and directly welded straight pipe in the pipe tee,
The method of the connection of titanium pipe will be seriously affected
The life of titanium pipes.
Design, procurement and construction shall be carried out according to the standard.

Nickel titanium memory alloy in medicine

The current clinical routine incorporate the nickel titanium alloy titanium cn as the most early the arch wire.
Correctional system arch wire, so the patient's discomfort will reduce greatly.Because there are several different straight wire bow rectification technology, MBT technology is recommended to use 0.016 inches thermal activated nickel titanium arch wire  DEMON self-locking braces technologies recommended by Omcro company production of thermal activated nickel titanium alloy containing copper arch wire, and correcting technology is recommended to use 0.016 inches hyperelastic nickel titanium alloy used in early row of neat the arch wire.Nickel titanium spring: nickel titanium push spring and the tension spring is a spring for orthodontic teeth, especially with niti super elastic, suitable for orthodontic treatment for the development of the gap between teeth and pull in different directions of teeth.The nickel titanium coil spring elongation 1 mm can produce about 50 g force.Nickel titanium coil spring has a high elastic properties, can be produced under tensile state is relatively soft, stable endurance.Force attenuation is small, can produce in accordance with clinical mobile teeth required ideal orthodontic force.In line with the physiological requirements.Nickel titanium wire tension spring high elastic and permanent deformation rate is extremely low, compared with the same diameter stainless steel wire, the treatments of the releasing force is 3.5 4 times.In orthodontic treatment for applications, the patient pain is light, not only feel soft power lasting, and follow-up time reduced, shorten the treatment course, improve the curative effect, is a kind of new excellent mechanics in orthodontic treatment device.
 when the arch wire when the arch wire was ligated to braces, that is activated when the stress and the arch wire is slowly getting back to the arch wire while moving the teeth the gap between its original condition when the stress is small.The lag is very small.SOMA and compared the LH arch wire and other nickel titanium alloy wire stress strain curve of L - H minimum range of the lag of the arch wire, this feature makes the arch wire has the advantage of low load and constant light force, low initial slope of the curve at the same time, show that the stiffness of the arch wire is low, the rest of the type of nickel and titanium alloy hysteresis curve indicates that the arch wire, which has less rigidity are clearly L - H arch wire has obvious mechanical advantage.Because of LH silk nickel titanium components content of titanium in proportion is generally high nickel titanium arch wire, so call it titanium nickel wire, and has proved its effect in shock absorption is stronger.LH nickel titanium wire of another characteristic can be bending, and can be used to heat treatment equipment heating sizing, therefore LH nickel titanium wire can also be from a row of neat flat, open bite to close the gap, and finally completed stage, the upper one is the arch wire can complete treatment, as long as each phase remove arch wire bending shape needed for good, then use heat treatment of the instrument will be shaped, strengthen the hardness.Currently in clinical use of L - H to enlarge the arch wire bow treatment, open jaws, partial jaws and diseases of the jaws, because of its strength in a steady and soft, the effect is better.At the same time often used J hook to improve the shortage of the arch wire is soft.Although MEAW technique to correct the above wrong jaw also have ideal effect, but the bending the arch wire of heavy and complicated is often makes many physicians.So some doctors to use rocking chair similar to that of the mechanical system model of nickel titanium arch wire with front teeth vertical traction, though this has a similar effect

Titanium pipe weld detection

NDT is in working condition under the premise of no damage to the workpiece and raw materials, the surface of the parts to be tested and internal quality inspection means of a test.titanium cn
Commonly used NDT methods: X-ray flaw detection, ultrasonic testing, magnetic particle testing, penetration testing, eddy current flaw detection, gamma ray flaw detection and fluorescence detection, such as coloring flaw detection method.
Weld penetration test methods and defect classification of mark of trace
Theme content and scope of application
This standard specifies the weld and adjacent parent metal surface defect inspection method (fluorescent dye penetrant inspection and test) and defects
Grading of marks.This standard applies to the following metal surface defects of weld inspection:
use nonmagnetic material welding seam;
the fillet weld of magnetic materials and magnetic particle inspection have difficulty or weld inspection result is bad, such as double docking weld root in the process of inspection, etc.Penetration testing method
Weld penetration inspection personnel should be according to the provisions of the relevant disciplines through strict training and examination, and a corresponding appraisal organization
The level of qualification certificates;Weld penetration inspection personnel's vision should be checked once a year, vision correction shall be not less than 1.0, no color blindness and blindness.

Inspection fluid including agent, penetrating agent, emulsifier, detergents and imaging should be inspection welding seam and its effect on the mother material without corrosion.
When inspection nickel alloy welding seam, each agent of liquid sulfur content should not exceed with analysis of the proceeds of the residues of 1%;When the austenitic stainless steel or titanium alloy weld inspection, each of the testing liquid chlorine and fluorine content should not be more than the sum of use
You should use the same manufacturer production of the same series of form a complete set of testing liquid, different kinds of testing are not allowed to be mixed fluid.
After inspection of weld with coloring method, and fluorescent inspection if required, must be conducted only after the clean up.
In order to control the quality of the liquid penetration inspection need, can according to
Checked the surface pretreatment parts of, it includes weld surface and on both sides of weld surface of the adjacent area of at least 25 mm;Using mechanical method (such as grinding) clearance were surface welding slag, weld spatter, rust and scale;By adopting the method of solvent (water or cleaning agent)
Cleaning were found on the surface of the grease may cover surface defects such as chip, fiber shows or interference inspection of foreign material.Not allowed to use sandblasting, shotblast may block surface defects such as cleaning method;When the weld welding wave or other surface irregular shape affects a penetrant inspection, should be polished smooth.After cleaning the surface of the strong rely on natural evaporation or with the appropriate hot air so that it is fully dry.
Usable dip, brush, spray any kind of methods, such as applying penetrant;For osmotic treatment temperature for 15 ~ 50 ℃, infiltration time shall not be less than 5 min or specified in the instructions for use of penetrating agent use penetrating time.In the infiltration time, should maintain the penetrating agent checked surface wetting, when the temperature in the range of 3 ~ 15 ℃, the time should be appropriately increased permeability according to temperature condition, less than 3 ℃ or above 50 ℃, shall consider the decision, and note it in the inspection report;Wash the treatment and removal.

titanium and titanium alloy welding

Titanium and titanium alloy titanium cn with a small specific gravity, high strength and good high and low temperature performance, it in wet chlorine gas, oxygen acid salt,
Stone of urea, nitric acid, acid, phenol and other most acid, alkali, salt medium has excellent crack resistance and corrosion resistance
Can, make it become the prospects for a broader range of new structure material, more and more widely used in petroleum chemical industry, military industry,
Aerospace, pharmaceutical and other fields.


But, as a result of titanium in high temperature, strong chemical lively sex, high melting point, small amount of hot melt and poor thermal conductivity
Characteristics, so its weldability and ordinary carbon steel, low alloy steel, stainless steel, aluminum, copper and so on different significantly
Points.


In order to open up channels for production, adapt to the needs of my company's chemical production, we conducted industrial pure titanium welding process
Test and welding joint quality control of project study.
Pure titanium welding technology main points:
Welding environment ventilated, dry, dust-free and steel structure prefabrication site isolation.Wind speed is small
At 2 m/SEC, with indoor (or relative) homework as well.The humidity is less than 90%.Chemical composition and mechanical performance of welding wire with the parent metal, high plasticity, the purity should be higher than the parent metal.The argon gas purity is greater than or equal to
Moisture 99.99%, less than or equal to 50 ml/m. should have high frequency arc welding machine, current attenuation and gas delay protective device.
After welding inspection
Weld surface inspection, colour and lustre is whether inspection of industrial pure titanium oxide, check the protective effect and important
Ring.Each layer of each bead should be checked to find unqualified bead heavy weld shall be removed.
The underlying weld shall be to penetrate for inspection.
Butt joint X-ray flaw detection should be 100%
Titanium pipe welding technology is in the atmosphere using manual tungsten inert gas protection welding welding method.Before welding of titanium pipe groove and less than 25 mm on both sides of the internal and external surface after removal of oil pollution, application of austenitic stainless steel wire brush, reamer and other mechanical methods to remove the oxide film, burr and surface defects.Cleaning tools should be dedicated, and kept clean;After mechanical cleaning the surface of the groove and the fill welding wire, welding should use sulfur-free acetone or ethanol degreasing treatment.During the welding process, the use of special protective measures, make the titanium pipe welding area partial or all of the parts may be over 400 ℃ temperature in argon gas protection, achieve the goal of titanium pipe welding.
Under construction and prepare materials acceptance to line inspection, processing and groove to groove peripheral processing, welding group on to welding, weld appearance inspection to P T, RT flaw detection, hydrostatic test to drainage, drying, prefabricated pipe section pipe mouth closed transportation and assembly on site.