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What is spiral welded pipe

Spiral welded steel pipe refers to a steel pipe with seams on the surface that are welded into a round or square shape by bending a steel strip or steel plate.


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 a welded pipe, Bondi pipe, etc.


According to the weld shape, it can be divided into straight seam welded pipe and spiral welded pipe.


Electric welded steel pipes are used in oil drilling and machinery manufacturing. Furnace welded pipes can be used as water gas pipes, and large diameter longitudinally welded pipes are used for high-pressure oil and gas transportation, etc.;


Spiral welded pipes are used for oil and gas transportation, pipe piles, bridge piers, etc. Welded steel pipes have lower cost and higher production efficiency than seamless steel pipes.


The longitudinal welded pipe has a 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 also be used to produce welded pipes with different pipe diameters. But compared with the seam straight pipe of the same length, the weld length is increased by 30-100%, and the production speed is lower. Therefore, most of the smaller diameter welded pipes adopt straight seam welding, and the large-diameter welded pipes mostly adopt spiral welding.