SPIRAL STEEL PIPE PRODUCTION PROCESS IS WHAT?

1. unwinding board probe: After entering the unwinding plate production line, the first full-board ultrasonic testing.
2. Leveling Milling: The flat steel anvil machine so that the original curl, and then through the edge milling machine for two-sided steel milling, so as to meet the requirements of the plate width, plate edge parallelism and groove shape.
3. shear molding: the steel plate production line along the outer edge of the spiral curl into a tube.
4. butt cut: double-sided submerged arc welding using advanced technology to pre-welding, internal welding, outside welding. The welded steel pipe using a plasma-foot cut to specification length.
5. visual inspection: by professional and technical personnel to some of the basic parameters to be checked.
6. The ultrasonic flaw detection: internal and external weld and weld on both sides of the base material 100% inspection.
7. X-ray detection: internal and external welds 100% X-ray industrial TV check image processing system to ensure that the use of detection sensitivity.
8. The pressure test: the steel pipe hydrostatic testing machine shall be tested individually to ensure that the test pressure pipe meet the required standards.
9. chamfering flat head: steel pipe inspection carried out after the pipe end processing, to meet the requirements of the pipe end beveling size
10. Finally check: again ultrasonic and X-ray detection as well as magnetic particle inspection pipe end, check if there are problems and welding pipe ends defects.
11. oiled marking: steel after passing were oiled to prevent corrosion, and according to user requirements for marking.
In addition to the above test items, according to the API standard and other relevant standards and the special requirements of some users, but also the need for steel, steel pipe and other tests Destructive tests, including physical and chemical properties of the raw materials into the plant sampling, visual inspection of 100% steel .