Cold drawn precision steel tube is the manifestation of poor welding welding management intermediate above on both sides, the product welding surface uneven, more not smooth. Hi-lo product can make the welding area decreases, the specific work is aluminium coated tubes easy to cause stress, reducing compressive strength of the welding. Weld forming and hi-lo faults because the welders actual caused by improper operation. Such as welding such as high working voltage, welding speed too fast is caused by the faults. For welding molding and hi-lo faults, should strengthen precision steel pipe welding welders skills and work quality, should exercise strict supervision on welding products.
In flash welding defects root cause is the result of a welding seam to eliminate not neat or electrode metal oxide air pollutants. For flash is supposed to, about the product welding seam clean-up, manipulation of the welding environment, avoid scraps into the welding.
Surveillance in mouth of cold drawn precision steel pipe right or wrong, and the main ruler on one side of the weld, then highly feet move to just touch the other side of the weld. Out the accurate measurement of height to width ratio is hi-lo amount, according to specifications and specific needs right and wrong, mouth in manipulation.
Points, according to use thick walls stainless steel tube 304 of precision steel tube of general purpose and high temperature and high pressure, etc., the latter with tubes are often alloy steel, you need to consider and solve the problem of welding seam shrinkage crack in the welding process and the heat affected zone of tubing mechanical properties is not too big change due to welding operation effect.
According to the pipe wall thickness, steel strip made of thin materials such as pipe can use high frequency welding, some thin wall pipe can use the method of shielding gas, welding; Wall thickness greater than 2 mm pipe can use manual welding.
According to the size precision of steel tube diameter, small diameter of only one side welding and technicians to implement two sides welding can drilling pipe. One-side welding for welding technique request, can do two one-side welding forming, through ball test, guarantee capacity and weld cross-sectional area have both comply with the design requirements.
As long as the material is alloy steel pipes, including heat resistance, high voltage, low temperature resistant alloy steel tube, are emphatically on the welding process to implement to Cold Drawn Seamless Tubes avoid produce martensite structure due to the welding of high temperature, the tendency of cracks, the craft is general requirements, electrode to choose good, and baking to welder use, according to the requirements on both sides of weld welding before going to oil, water, rust, debris, clean, welding line energy as less as possible, to minimize the swing welding process, after the arrangement of a welding seam annealing heat affected zone for as much as possible. Slow cooling after welding, cover good measures with asbestos cloth, etc.
In order to ensure quality of welding, the welder training and exam, qualified mount guard. Welder to weld good precision steel tube, in addition to the basic theory, to hone skills that could contain the downhand welding process, vertical and overhead welding several gesture, choose good to take care of the size of the current to the vertical and overhead welding forming, process control, good arc stability and forming can swing appropriately, combined with good shape and rocking.
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