Straight seam welded steel pipe finished product is completed, the appearance of the weld to be checked, the weld surface to be smooth, there is no crack phenomenon. But also on the weld fusion status check to see whether the weld
porosity, slag inclusions and so on. In the production of straight seam steel pipe, weld defects caused by the following reasons:
1. Welding seams are not soldered, there are impurities on the surface or too large openings.
2. Welding speed should not be too fast.
3. Welding strictly control the speed and current size, or easily form a stoma.
