Straight seam steel pipes can be divided into high-frequency straight seam resistance welded pipes (ERW pipes) and submerged arc welded straight seam steel pipes (LSAW pipes) according to the production process. Submerged arc welded straight seam steel pipes are divided into UOE, RBE, JCOE, etc. according to their different forming methods. JCOE steel pipe production process is simple, high production efficiency, low cost and rapid development

High-frequency welding is a new welding process that uses the skin effect and adjacent effect produced by high-frequency current to join steel plates and other metal materials. The emergence and maturity of high-frequency welding technology is a key process in the production of straight seam welded pipes (ERW pipes). The quality of high-frequency welding directly affects the overall strength, quality level and production speed of welded pipe products.

High temperature resistant stainless steel pipe is austenitic chromium-nickel stainless steel, which has good oxidation resistance and corrosion resistance. Because of the higher percentages of chromium and nickel, it has much better creep strength, can continue to operate at high temperatures, and has good high temperature resistance.

Composite pipes are pipes based on a composite structure of metal and thermoplastic plastic. The inner and outer layers are made of non-metallic materials such as polyethylene and polypropylene. The middle layer is a metal structure, and the composite pipe is combined with special hot melt adhesive and has the advantages of metal pipes and non-metal pipes.

The deformation caused by the welding process directly affects the performance and use of the welded steel pipe, so it is necessary to use different welding processes to control and prevent the deformation of the steel pipe, and to correct the components that produce welding deformation.

The welding stress of the steel pipe is the stress generated by the welding of the seamless pipe or the welded pipe. Welding residual stress has six influences on steel pipes.