Titanium Welded pipe

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Preface titanium because of its good corrosion resistance, high specific strength and good processing performance and is processed into various products used in many fields.Titanium tube is one of very important species in the family of titanium, and the application is very broad.And titanium welded pipe as a kind of relatively unique titanium pipe product form, is made from titanium cold-rolled coil tube, using tungsten inert gas welding welding and into.

Titanium welded pipe relative to the titanium seamless pipe has the advantage of large diameter and thick wall, regardless of the welded tube from straightness or from appearance to make beautiful, do seamless tube, the current domestic jiangsu there can do, only to can only be called pipe, tolerance, etc., and standard deviation of the far, can say is that there is no standards.Small diameter thin wall pipe seamless tube is do is beautiful beautiful, this is because the thin and small, restricted by production process.Around 100, the wall thickness more than 2 or 3, seamless tube, and welded tube could do it, the same specifications of welded pipe price is relatively low.

The difference between titanium welded pipe and seamless pipe:

Made from seamless tube with extrusion process, the welding of titanium tube sheet using curl after welding and become, generally relatively small seamless pipe wall thickness, diameter is also small, seamless tube generally perform ASTM standard B338, welded pipe generally perform ASTM B862 standard, makes no difference in use.

Titanium pipe welding titanium cn technical materials: titanium pipe welding using love is gas effectively protect of the welding zone of the TiG welding process, because the titanium has special physical and chemical properties, and its welding process and other metal is put in bigger difference.Titanium pipe welding must ensure that:

(1) the weld zone metals at above 250 ℃ from the reactive gas N, 0, harmful impurity elements C, H and Fe, Mn, etc.

(2) cannot form coarse grain structure.

(3) does not produce larger welding residual stress and residual deformation.So, welding process is to be prepared in accordance with the scheduled construction order, working procedure quality management in strict accordance with the standards, implement the whole process of quality control. Make people, machine, material, method, the factors are in good state controlled, and within a reasonable time limit for a project, ensure the quality of welding of the titanium pipe.

Argon gas before use to check factory certification on the bottle, to verify the purity of argon gas index, and then check whether there is any leak or failure on cylinder valves as first.< / SPAN >

(4) titanium pipe welding technology is in the atmosphere using manual tungsten inert gas welding (GTAW) welding method, welding groove of titanium tubes before and within 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.