Spiral welded pipe, as the name implies, is a steel pipe which has a seam running its entire length in a spiral form.With the development of the Submerged Arc Welding process, the production of large hot rolled coils of sufficient width and the development of dependable non-destructive testing methods, it is now possible to produce spiral welded pipe for high pressure service.
Manufacturing Process:
1. Coil Probe: steel coil into the production line, the first full board Ultrasonic Inspection.
2. Leveling Milling: through anvil plate leveling machine so that the original curl, and then pass the two edges of steel-sided milling machine milling, so that up to the requirements of the plate width, plate edge parallel groove shape.
3. Cut Type: steel production line along the outer edge of the coiled-coil tube.
4. welding and cutting: the use of advanced technology for pre double submerged arc welding cutting inside from the foot of the welding specification welded steel pipe welded outside use, etc.
5. Visual inspection: some basic parameters by a professional technician check.
6. ultrasonic flaw: the inner and outer sides of the base metal and weld seam 100% inspection.
7. X-ray detection: internal and external welds 100% X-ray television industry checks, the use of image processing system ensures detection sensitivity.
8. Pressure test: hydrostatic testing machine by-root test steel pipe up to the standard requirements to ensure that the test pressure.
9. Chamfer level: steel pipe inspection pipe end processing, up to the requirements of the pipe end beveling size.
10. Check: X-rays and then subjected to ultrasonic testing and magnetic particle inspection conducted pipe end, check whether the deposit welding problems and defects in the pipe ends.
11. Oiled Marking: Qualified oiled steel pipe corrosion and in accordance with user requirements for marking.
