What is the difference between LSAW pipe and SSAW pipe

Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or strip after crimping and forming. The welded steel pipe has the advantages of simple production process, high production efficiency, more varieties and specifications, less equipment investment, but its general strength is lower than that of seamless steel pipe. Since the 1930s, with the rapid development of high-quality strip continuous rolling production and the progress of welding and inspection technology, the weld quality has been continuously improved, the varieties and specifications of welded steel pipes have been increasing, and the seamless steel pipes have been replaced in more and more fields. Welded steel pipe is divided into LSAW pipe and SSAW pipe according to the form of weld.

LSAW pipe has the advantages of simple production process, high production efficiency, low cost and rapid development. The strength of SSAW pipe is generally higher than that of LSAW pipe. It can produce larger diameter SSAW pipe with narrow blank and different diameter SSAW pipes with the same width blank. However, compared with the same length LSAW pipe, the weld length of SSAW pipe increases by 30-100%, and the production speed is low.

Therefore, most of the welded pipes with smaller diameter are straight seam welded LSAW pipe, while most of the welded pipes with large diameter are spiral welded SSAW pipe.