---

　　Welded steel pipe, also known as welded pipe, is a steel pipe welded with steel plate or steel strip after crimping. Welded steel pipe has the advantages of 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.

　　With the rapid development of high-quality strip continuous rolling production and the progress of welding and inspection technology, the weld quality is continuously improved, the varieties and specifications of welded steel pipes are increasing, and seamless steel pipes are replaced in more and more fields. Welded steel pipes are divided into straight welded pipe and spiral welded pipe according to the form of weld. Longitudinal welded pipe has the advantages of simple production process, high production efficiency, low cost and rapid development.

　　The strength of spiral welded pipe is generally higher than that of straight welded pipe. It can produce welded pipe with larger pipe diameter with narrow blank, and welded pipe with different pipe diameter with blank of the same width. However, compared with the straight seam pipe with the same length, the weld length increases by 30 ~ 100%, and the production speed is low. Therefore, straight seam welding is mostly used for small-diameter welded pipes, and spiral welding is mostly used for large-diameter welded pipes.

---

Previous: Classification of carbon steel pipes
Next: What are the steps for cleaning hollow sections?

---