Bright steel pipe is a refined steel pipe that is cold drawn or cold rolled. Bright seamless pipes must undergo non-oxidation bright heat treatment (NBK state), non-destructive testing, the inner wall of the steel pipe is brushed with special equipment and high-pressure flushing, anti-rust oil is applied to the steel pipe for anti-rust treatment, and both ends are capped for dust-proof treatment.

Large-diameter spiral steel pipe is a general term, generally referring to spiral steel pipes (SSAW steel pipe) with a diameter greater than 1 meter. Spiral steel pipe is a welded steel pipe made of steel strips that are bent and then welded. Steel pipes need to undergo hydraulic pressure, bending, flattening and other experiments, and have certain requirements for surface quality. The delivery length is usually 12 meters, and delivery to fixed length is often required.

The submerged arc welding method is one of the main production methods of welded steel pipes. Steel pipes welded by the submerged arc welding process include straight seam submerged arc welded steel pipes (LSAW steel pipes) and spiral submerged arc welded steel pipes (SSAW steel pipes).

Galvanized steel pipe has the dual advantages of corrosion resistance and long service life, and the price is corresponding to that of carbon steel seamless pipe or welded pipe, which is relatively cheap and has an increasing usage rate. However, some users do not pay attention when welding galvanized pipes, resulting in steel pipe defects. So what issues should we pay attention to when welding galvanized pipes?

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.