Spiral steel pipe in the production process, should pay attention to the following questions:
1, oiled marking: the inspection and approval of spiral steel pipe oiled operation to prevent corrosion, and marking according to customer requirements.
2, leveling milling: Use anvil machine plate leveling of 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 along the outer edge of the spiral curl into a tube.
4, butt cut: using double-sided submerged arc welding technology to pre-welding, welding inside and 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, ultrasonic testing: internal and external weld and weld on both sides of the base material 100% inspection.
7, X-ray testing: internal and external welds 100% X-ray industrial TV check image processing system to ensure that the use of detection sensitivity.
8, pressure test: the spiral steel pipe hydrostatic testing machine-by-root test to ensure that the steel pipe meet the standard requirements of the test pressure.
9, chamfering flat head: spiral steel pipe inspection carried out after the pipe end processing, to meet the requirements of the pipe end beveling size.
10, the last check: Spiral Pipe again ultrasound and X-ray detection as well as magnetic particle inspection pipe end, check if there are problems and welding pipe ends defects.