Since the 1930s, with the rapid development of high-quality strip continuous rolling production and the advancement of welding and inspection technology, the quality of welds has been continuously improved, and the variety and specifications of welded steel pipes have increased, and they have replaced non-metallic steel in more and more fields. Seam the steel pipe. Welded Steel Pipes are divided into straight seam welded pipes and spiral welded pipes according to the form of welds. Classification by production method: Process classification-arc welded pipe, resistance welded pipe, gas welded pipe, furnace welded pipe.
Smaller-caliber welded pipes are welded by straight seam, while large-caliber welded pipes are mostly spiral welded; according to the shape of the end of the steel pipe, it is divided into round welded pipe and special-shaped welded pipe; according to the material and purpose, it is divided into mining fluid conveying welded steel pipe and low pressure fluid conveying Galvanized welded steel pipes, electric welded steel pipes for belt conveyor rollers, etc. are used.
Welded Steel Pipes
The blanks used for welded steel pipes are steel plates or strip steels, which are divided into furnace welded pipes, electric welded pipes and automatic arc welded pipes due to their different welding processes. Because of its different welding forms, it is divided into two types: straight seam welded pipe and spiral welded pipe. Because of its end shape, it is divided into circular welded pipe and special-shaped welded pipe.
Seamless Pipe has simple production process, high production efficiency, low cost and rapid development. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. A narrower blank can be used to produce welded pipes with larger pipe diameters, and a billet with the same width can be used to produce welded pipes with different pipe 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.
Large diameter or thick welded pipes are generally made of steel billets directly, while small welded pipes and thin-wall welded pipes only need to be directly welded through steel strips. Then after a simple polishing, drawing is fine.
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