Welded Steel Pipe, also known as welded pipe, is a steel pipe made of steel plate or strip steel after crimping and forming. Generally, the length is 6 meters. Welded steel pipe has simple production process, high production efficiency, many varieties and specifications, and less equipment investment, but its general strength is lower than that of Seamless Steel Pipe.
The blank used for welding steel pipe is steel plate or strip steel, which is divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welded pipe due to different welding processes. Because of the different welding forms, it can be divided into straight seam welded pipe and spiral welded pipe. Because of its end shape, it can be divided into circular welded pipe and special-shaped (square, flat, etc.) welded pipe.