Spiral Steel Pipe Weld Process
Date:2018-02-23 View:956 Tag:Spiral Steel Pipe Weld Process
Spiral pipe (spiral submerged arc welded pipe) into a steel unit, multi-roll rolled strip gradually rolled up to form a gap opening pipe, squeeze roll reset adjustment, in 1 ~ 3mm, weld gap control and welding end of the rinse .
1. If the gap is too large, resulting in reduced proximity effect, lack of eddy current, poor weld crystallization, indirect fusion or cracking bad.
2. The gap is too small, resulting in increased proximity effect, excessive welding heat, causing the weld to rupture; weld or extrusion, the formation of pit after rolling, affecting the weld surface quality.
After the tube is heated at both ends, the welding temperature is squeezed by the squeezing roller to form common metal particles which penetrate each other and crystallize, finally forming a solid weld. If the spiral tube extrusion pressure is too small, the formation of a small number of eutectic, the stress reduction of weld metal strength will produce cracking; if the pressure is too large, will make the molten metal is squeezed out of the weld, not only reduces the weld strength , But also produce a lot of internal and external burr, and even cause defects such as welding seam.