Spiral pipe (ssaw steel pipe): through belt rolling forming machine, fold the spiral direction, and then through the capacitor for double-sided submerged arc welding. Spiral welded steel pipe production process, in many cases prone to leakage, such as welding and staggered edges. However, in these cases, Chlamydia is the most difficult to master the spiral steel butt weld.


The so-called trachoma: that is, the welding process on the inner surface of the weld or on the weld, without thoroughly penetrating particles or bubbles, and the shape of sand pits on the surface of the weld. The causes of trachoma are as follows:
1. During the power supply period of the torch, the current is too small, the capacitance is too short, the capacitor is not thoroughly welded, and the welding surface has been hardened, so sand penetration or foaming occurs.
2. There is no good docking when the cutter is adjusted to strip curvature. The docking strips are completely mismatched, and there is too much gap between the docking strips.
3. When butt welding steel, there is no cleaning of strip edge or rust scale on both sides.
4. No timely maintenance of production equipment for cleaning. Dust or dirt on the worktable falls into the gap incorrectly at the butt weld of steel.
5. The working temperature of workshop is too low or too wet, which affects the temperature and dryness of welding joint.