Electric resistance welded (ERW) pipe is made from steel coil and the weld seam runs parallel to the pipe. The width of the coil is the same as the circumference of the pipe so diameters are limited to 24 inches. However, because
Spiral-welded pipe is manufactured from coils of steel that are unwound and flattened. The flattened strip is formed by right-angle rollers into a cylinder of the desired diameter.Spiral-welded pipes are available in sizes from 600 mm to 3650 mm. Implementation standards：GB/T 8162,
Longitudinal Submerged Arc Welding (LSAW / SAWL) is a specific welding technique used in pipe production where the finished product requires a particularly high wall thickness due to high internal or external pressures.The LSAW pipe diameter range is larger than ERW (Electric
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