If the welded pipe cannot be adjusted straight, first check to see if the problem lies in the sizing, because it is very important to affect the straightness of the welded pipe.

Forming adjustment is the basis of welded pipe adjustment. The industry recognizes that welded pipe adjustment is an art. Among them, forming adjustment is the jewel in the art palace.

Common problems in the removal process of internal burrs include scraping, deep scraping, shallow scraping, etc., any of which will affect the quality of weld flaw detection and reduce the yield of welded pipes, especially the thickness of the weld at the weld due to deep scraping of internal burrs. If the requirements are not met, the bearing capacity here is insufficient.

The strip steel is fed into the welded pipe mill, rolled by multiple rollers, and the strip steel is gradually rolled up to form a round billet with open gap. The reduction of extrusion roller is adjusted to control the weld gap at 1 ~ 3mm, and the two ends of the weld joint are flush. If the gap is too large, the proximity effect will be reduced, the eddy current heat is insufficient, and the weld is not fused or cracked due to poor intergranular bonding.

High frequency welding was invented in the early 1950s and has been rapidly applied in industrial production. It uses 10 ~ 500KHz At present, high frequency welding is mainly used in pipe and profile production lines with high degree of mechanization or automation.

Weld reinforcement refers to the height of the part of metal on the connecting line between the two welding toes on the weld surface. Generally speaking, reinforcement refers to the part protruding from the base metal surface or the deposited metal above the connecting line at the end of fillet welding (i.e. welding toe).

Steel pipe is generally divided into seamless steel pipe and welded steel pipe according to production methods.

Weld cracks mostly appear in the weld, showing fine hair, most of them occur in the superficial weld, some can be seen with the naked eye, some need to be carefully identified or even enlarged to find.

Welding thermal cycle refers to the process in which the temperature of a certain point on the edge of tube billet changes with time under the action of heat source generated by high frequency welding current. Welding thermal cycle reflects the thermal effect of welding heat source on weld and nearby metal, causing different changes in microstructure and properties. At the same time, it also provides reference for finding good welding process, improving weld microstructure and predicting weld stress through process means This is the way.

After the welded pipe blank is formed into a cylinder, it enters the induction ring. Due to the skin effect and proximity effect of the current, the edge of the pipe blank is heated to a semi molten or molten state.