Spiral submerged arc welded pipe in the production process, we need to pay attention to a series of problems. In addition to the following test items, according to API standards and other relevant standards and some special requirements of users, but also need to destructive testing of steel pipe, steel pipe, etc., including physical and chemical properties of raw materials into the factory sampling, visual inspection of 100% steel.
Oiled Marking: Oiled steel, to prevent corrosion, and according to user requirements for marking.
Leveling milling: The flat steel anvil machine so that the original curly, and then through the milling machine for double-sided steel milling, so as to meet the board width, edge parallelism and groove requirements.
c. Shear molding: The steel sheet production line is spirally crimped into tubes along the outer edges.
Butt cutting: double-sided submerged arc welding using advanced technology for pre-welding, welding, welding. Plasma cut to the length of the welded steel pipe specifications.
