The process of spirally welded steel pipe with steel-plastic pipe is simple, production efficiency is high, cost is low and development is fast.

The process of spirally welded steel pipe with steel-plastic pipe is simple, production efficiency is high, cost is low and development is fast.

Spirally welded steel pipe is a kind of steel pipe which is welded by bending steel strip or steel plate into circular or square shape and has seams on its surface. According to different welding methods, it can be divided into arc welded pipe, high frequency or low frequency resistance welded pipe, gas welded pipe, furnace welded pipe, Bondi pipe and so on. According to the weld shape, it can be divided into straight welded pipe and spiral welded pipe. Welded steel pipes are used in petroleum drilling and mining, machinery manufacturing, etc. Furnace welded pipe can be used as water gas pipe, large diameter straight seam welded pipe for high pressure oil and gas transmission, spiral welded pipe for oil and gas transmission, pipe pile, pier and so on. Welded steel pipe has lower cost and higher production efficiency than seamless steel pipe. 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 bigger diameter with narrower blank, and welded pipe with different diameter can also be produced with blank of the same width. However, compared with the straight seam pipe of the same length, the length of the weld increases by 30-100%, and the production speed is lower. Therefore, most of the smaller diameter welded pipes are welded by straight seam welding, while the larger diameter welded pipes are mostly welded by spiral welding. Spiral welded steel pipe is a kind of steel pipe with joints on its surface, which is formed by bending and deformation of steel strip or steel plate into circular or square shape. According to different welding methods, it can be divided into arc welded pipe, high frequency or low frequency resistance welded pipe, gas welded pipe, furnace welded pipe, Bondi pipe and so on. According to the weld shape, it can be divided into straight welded pipe and spiral welded pipe. Welded steel pipes are used in petroleum drilling and mining, machinery manufacturing, etc. Furnace welded pipe can be used as water gas pipe, large diameter straight seam welded pipe for high pressure oil and gas transmission, spiral welded pipe for oil and gas transmission, pipe pile, pier and so on. Welded steel pipe has lower cost and higher production efficiency than seamless steel pipe. 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 bigger diameter with narrower blank, and welded pipe with different diameter can also be produced with blank of the same width. However, compared with the straight seam pipe of the same length, the length of the weld increases by 30-100%, and the production speed is lower. Therefore, most of the smaller diameter welded pipes are welded by straight seam welding, while the larger diameter welded pipes are mostly welded by spiral welding.