Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or strip steel after crimping and welding, generally 6 meters. Welded steel pipe production process is simple, high production efficiency, variety specifications, less equipment investment, but the general strength is lower than seamless steel pipe.
Small diameter welded pipe adopts straight seam welding, large diameter welded pipe adopts spiral welding. According to the shape of the end of the steel pipe, it is divided into circular welded pipe and special-shaped (square, rectangular, etc.) welded pipe; According to different materials and uses, it is divided into welding steel pipes for mining fluid transportation, galvanized welded steel pipes for low pressure fluid transportation, and electric welded steel pipes for belt conveyor rollers. According to the specification and size table in the current national standard, the external diameter * wall thickness is sorted from small to large.