Spiral pipe features: straight seam welded pipe production process is simple, high production efficiency, low cost, rapid development. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. It can produce welded pipe with larger pipe diameter with narrow blank, and can also produce welded pipe with different pipe diameter with blank of the same width. However, compared with the same length of the straight seam pipe, the length of the weld is increased by 30 to 100, and the production speed is low. Therefore, most of the smaller diameter welded pipes are welded by straight seam welding, and most of the large diameter welded pipes are welded by spiral welding.