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 side impact door beams specific work is 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.
Two edges of billet heating to welding temperature, under the extrusion of squeezing roller, to form a common metal grain interpenetrate, crystallization, forming solid weld. If aluminium tube extrusion is too small, the number of common crystal is small, weld metal strength, stress produces after cracking; If the extrusion pressure is too large, will make molten metal being squeezed out of the seam, not only reduce the weld strength, and can produce a large number of inside and outside burr, may cause welding lap seam, etc.
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 aluminium coated steel tube 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.
Aluminium tube folding weld process is as follows: if the clearance is too large, resulting in a decrease of proximity effect, eddy heat is insufficient, the joint between the weld crystal bad and incomplete fusion or crack side impact beams generation. Such as proximity effect increases, the gap is too small a result of welding heat is too big, cause the burning of the weld; Or weld after extrusion, rolling the deep pit formation, affect the aluminized pipe weld surface quality.