Raw material uncoiling-leveling-end cutting and welding-looper-forming-welding-internal and external weld bead removal-pre-correction-induction heat treatment-sizing and straightening-eddy current testing-cutting-water pressure inspection-pickling-final inspection (Strictly check)-packaging-shipping.
Longitudinal welded 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. However, compared with the straight seam pipe of the same length, the weld length is increased by 30-100%, and the production speed is lower.