Trachoma welding reasons

Spiral pipe (spiral submerged arc welded steel pipe): By the belt molding machine, folded spiral direction, and then double-sided submerged arc welding is through the capacitor. Spiral welded pipe production process, prone to welding edge leakage and many other conditions. However, chlamydia appears to be the hardest to grasp helical butt weld in these situations.


The so-called trachoma: refers to the weld or weld the inner surface of the welding process, there is no particle or bubble thorough penetration, as well as the surface of the weld pit shape. Trachoma for the following reasons:
1, welding current welding torch is too small, the capacitor is too short, the capacitor is not fully welded when welding, the welding surface has hardened, so there will be sand or bubble-free.
2, machetes tune into a strip of curvature of the time is not good butt, butt is not fully matched, there is too much gap between the tailor welded plate.
3, the butt welding on both sides of the steel has not cleaned the edge of the strip rust or scaling.
4, there is no timely maintenance of production equipment to clean up. Workbench dust or dirt, scattered in the butt of steel.
5, the workshop temperature is too low or too wet, affecting the temperature and dryness of the welding point.