Longitudinally welded pipe maintenance collectionThe longitudinal welded pipe has a simple production process, high production efficiency, low cost, and rapid development. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. A narrower blank can be used to

The purpose of preheating the spiral steel pipe before welding(1) Preheating can slow down the cooling rate after welding, make hydrogen diffuse and escape in the weld metal, and avoid cracking caused by hydrogen. It can also reduce the degree of hardening of welds and heat-affected zones, and impro

Why can 3pe anticorrosive pipe be anticorrosive?3pe anti-corrosion pipe means a PE steel pipe with three layers of anti-corrosion. The main content of steel pipe includes seamless steel pipe, spiral steel pipe, and longitudinal welded pipe. 3pe anti-corrosion pipeline is widely used nowadays, a kind

What are the factors that cause horizontal lines in spiral seam submerged arc welded steel pipes?First of all, it may be due to the stress of the spiral seam submerged arc welded steel pipe. That is, the residual stress and welding stress after the steel pipe is formed.Secondly, due to the presence