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  • The spiral welded pipe mill line

    Process chart


    This mill is capable of making pipe for oil, water, and gas transmission or for pilings.
    1. decoiler and testing: decoiling with the steel strip, operate ultrasonic testing firstly.
    2. edge miller: make the steel sheet to required width, edge parallelization and groove shape.
    3. shearing and forming: shear the steel sheet to tubular shape according to the out-to-out spiral.
    4. welding and cutting: after finishing the inner and outer welding, cut the pipe to length.
    5. visual test: operated by technician with the main parameters.
    6. ultrasonic test: test the inner ,outer welded seam and the base metal.
    7. X-ray test: test the inner and outer welded seam.
    8. bulge test: test every steel tube with the hydrostatic testing machine.
    9. bevelling and facing: bevel the steel tube edge to required size.
    10. final test: ultrasonic and X-ray test again, magnetic particle inspection.
    11. oil coating and marking: do oil coating to protect corrosion, marking with customers¡¯ requirement.