1.       Marking with oil: Qualified SSAW steel pipes are coated with oil to prevent corrosion and marked according to user requirements.

2.       Leveling and milling: the original SSAW steel pipe is leveled by the anvil, and the two edges of the SSAW steel pipe are milled on both sides by the milling machine to achieve the required plate width, parallelism and slope of the plate edge.　　

3.       Shearing forming: The SSAW steel pipe is spirally crimped along the outer edge into a tube on the production line. 　　

4.       Butt welding cutting: using advanced double-sided submerged arc welding technology for pre-welding, internal welding and external welding. The SSAW steel pipe is cut to a standard length using a plasma ruler. 　　

5.       Visual inspection: some basic parameters are checked by professional and technical personnel. 　　

6.       Ultrasonic flaw detection: 100% inspection of the inner and outer welds and the base metal on both sides of the weld. 　　

7.       X-ray inspection: 100% X-ray industrial television inspection of the inner and outer welds, using an image processing system to ensure the sensitivity of the inspection.