The difference between high frequency welded steel pipe and straight-seam welded steel pipe

The difference between high frequency welded steel pipe and straight-seam welded steel pipe

First. Different in nature

A. High-frequency welded steel pipe: After the hot-rolled coil is formed by the forming machine, the skin effect and proximity effect of the high-frequency current are used to heat and melt the edge of the tube blank, and pressure welding is performed under the action of the squeeze roller to achieve production The product.

B. Longitudinal seam welded steel pipes: including double-sided submerged arc welded straight seam welded steel pipes and high-frequency resistance welding. The English abbreviation for high-frequency resistance welding is erw. Submerged arc welded straight seam steel pipes are divided into UOE and RBE according to their different farming methods. , JCOE steel pipe, etc.

Secound. The material is different

A. High-frequency welded steel pipe: The high-frequency resistance welded steel pipe has a different welding process from ordinary welded pipes. The weld is formed by melting the base material of the steel strip body, and its mechanical strength is better than that of ordinary welded pipes.

B. Longitudinal welded steel pipe: The material of longitudinal welded steel pipe mainly includes pipeline steel series such as Q195, Q215, Q345, and x42. Straight seam welded steel pipes are divided into ordinary steel pipes and thickened steel pipes according to the specified wall thickness. The steel pipes are divided into two types with thread and without thread according to the form of the pipe end.

Third. The characteristics are different

A. High-frequency welded steel pipe: smooth appearance, high precision, low cost, and small weld reinforcement, which is beneficial to the coating of 3PE anticorrosive coating. The welding methods of high-frequency welded steel pipes and submerged arc welded pipes are significantly different. Because welding is completed instantly at high speed, it is much more difficult to ensure welding quality than submerged arc welding.

B. Longitudinal welded steel pipe: The length of longitudinally welded steel pipe is mainly divided into fixed length and indefinite length. This is mainly based on customer requirements. The length is generally 6-14 meters. A large diameter longitudinally welded steel pipe may require two steel plates. Rolling this also forms a double weld.