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The definition and difference between straight seam welded pipe and spiral welded pipe

The definition and difference between straight seam welded pipe and spiral welded pipe

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  • Time of issue:2022-10-04 12:22
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(Summary description)Spiral welded pipe and straight seam welded pipe main raw material is low carbon steel hot rolled sheet coil, hot rolled belt, in petroleum, metallurgy, construction, coal mine, port, machinery, and other industries widely used in oil and gas transmission, low-pressure water gas transmission, mining fluid transmission, belt conveyor roller, car drive shaft and so on. 

The definition and difference between straight seam welded pipe and spiral welded pipe

(Summary description)Spiral welded pipe and straight seam welded pipe main raw material is low carbon steel hot rolled sheet coil, hot rolled belt, in petroleum, metallurgy, construction, coal mine, port, machinery, and other industries widely used in oil and gas transmission, low-pressure water gas transmission, mining fluid transmission, belt conveyor roller, car drive shaft and so on. 

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2022-10-04 12:22
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Information

Definitions, 

 

Spiral welded pipe and straight seam welded pipe main raw material is low carbon steel hot rolled sheet coil, hot rolled belt, in petroleum, metallurgy, construction, coal mine, port, machinery, and other industries widely used in oil and gas transmission, low-pressure water gas transmission, mining fluid transmission, belt conveyor roller, car drive shaft and so on. 

 

Spiral welded pipe is the low carbon structural steel or low alloy structural steel belt according to a certain helix Angle (also called forming Angle) rolled into pipe billet, and then the pipe seam welded together, it can be used to produce large diameter steel pipe with the narrow strip.  Spiral welded pipe is mainly spiral submerged arc welded pipe (SSAW), which is widely used in the construction of various gas pipelines. Its specifications are expressed by the outer diameter wall thickness.  The spiral welded pipe has single-sided welding and double-sided welding, welding pipe should ensure that the hydraulic test, weld tensile strength, and cold bending performance meet the requirements. 

 

Straight seam welded pipe is the hot-rolled coil after forming machine, so that the steel coil deformation into a smooth cylindrical shape, using high-frequency current skin effect and adjacent effect or flux layer burning arc welding, so that the edge of the tube billet heating melting, and under the action of a certain extrusion pressure fusion, cooling forming.  The pipes whose edges are melted by the high-frequency current are called high-frequency straight seam welded pipes (ERW), and those that are melted by arc are called straight seam submerged arc welded pipes (LSAW). 

 

 

The difference in the process 

 

The straight seam welded pipe production process is simple, with high production efficiency, low cost, and rapid development.  The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. It can produce welded pipe with a larger pipe diameter with a narrow blank, and it can also produce welded pipe with different pipe diameters with a blank of the same width.  But compared with the same length of straight seam pipe, the weld length increases by 30~100%, and the production speed is lower. 

 

Therefore, small diameter welded pipe mostly adopts straight seam welding, large diameter welded pipe mostly adopts spiral welding 

 

 

Spiral welded pipe is the low carbon structural steel or low alloy structural steel belt according to a certain helix Angle (also called forming Angle) rolled into pipe billet, and then the pipe seam welded together, it can be used to produce large diameter steel pipe with the narrow strip. 

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