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Spiral welded pipe is made by rolling low-carbon carbon structural steel or low alloy structural steel strip into a tube blank according to a certain helical angle (called forming angle), and then welding the pipe seam. It can be made with a narrower strip Steel produces large diameter steel pipes.
Spiral welded pipe is also a kind of welded pipe equipment. Its strength is generally higher than that of straight seam welded pipe. It can use narrower blanks to produce welded pipes with larger diameters, and can also use the same width of blanks to produce welded pipes with different diameters. But compared with the straight seam pipe of the same length, the weld length is increased by 30~100%, and the production speed is lower. Therefore, most of the welded pipes with smaller diameters adopt straight seam welding, and most of the large diameter welded pipes adopt spiral welding.
Spiral welded pipes have high requirements on technology, and as the demand for spiral welded pipes increases, its share in the market is increasing.