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.