The Cause of the Welds in Trachoma

Spiral pipe is the strip by roll machine, folding spiral direction, and then double-submerged arc welding is made through a capacitor. Spiral welded steel pipe production process, prone to leakage welding and in many cases the wrong side and so on. However, in these cases, trachoma is the most difficult to master spiral steel pipe butt weld.
The so-called trachoma: that the welding process in which the surface of the weld or welds, there has not been a thorough penetration of particles or bubbles, as well as the shape of the sand pits in the surface of the weld. Trachoma occurs because of the following:
1, the supply of the welding gun during welding current is too small, too short capacitor, the capacitor has not been completely thorough welding when welding surface has hardened, so there has not been the emergence of penetration of sand or bubbles.
2, into the strip-shaped curvature of the Scimitar tune when there is no good butt, butt strip does not match exactly, there has been too much of a gap between the butt strip.
3, butt welding strip when the two sides did not promptly clean up the edge of the strip of rust or scale.
4, the production equipment is not timely maintenance cleaning. Workbench dust or dirt, mistakenly fall into the gap at the butt weld strip.
5, the operating temperature is too low or too wet workshop, which affects the temperature and dryness of the solder joints.