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　　Welded steel pipe has the advantages of simple production process, high production efficiency, low cost and rapid development. The strength of spiral welded steel pipe is generally higher than that of straight seam welded steel pipe. It can produce welded steel pipe with larger pipe diameter with narrow blank of welded steel pipe, and can also produce 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.

　　Welded steel pipe with large or thick diameter are generally made of steel blank directly, while small welded steel pipe and thin-walled welded steel pipe only need to be welded directly through steel strip. Then after simple polishing, wire drawing is well.

　　Process flow of welded steel pipe

　　Uncoiling of raw materials - leveling - end shearing and welding - looper - forming - Welding - internal and external weld bead removal - pre correction - induction heat treatment - sizing and straightening - eddy current testing - cutting - hydraulic inspection - Pickling - * final inspection (strict control) - Packaging - shipment.

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