Piling with spiral carbon steel pipe is hot rolled steel coil tube billet, often spiral shape, made of double-sided submerged arc welding or high frequency welding, used in civil construction, port, bridge pile foundation with steel pipe. So what requirements are required to piling with spiral steel pipe? Here give you a detailed analysis of spiral tube mill.
1, raw material is steel strip coil, wire, flux. Have to pass strict physical and chemical inspection before investment.
2, the head and tail docking strip, use single or double wire submerged arc welding, after rolled steel tube adopts automatic submerged arc welding repair welding.
3, have continuous acoustic detection of weld mark parts, after manual ultrasonic and X-ray check, if there are defects, after repair, again through the nondestructive inspection, until defects have been eliminated.
4, strip steel butt weld and fellowship with spiral weld d joint in the tube, all pass X-ray films and television inspection.
5, each welded steel pipe after hydrostatic pressure test, radial sealing for the pressure. Test pressure and time are controlled strictly by steel pipe hydraulic microcomputer testing device. The parameters automatically printed out.
6, after welding the weld passes the online continuous ultrasonic automatic meter check, ensure spiral weld nondestructive testing coverage of 100%. If there are defects, automatic alarm and spray tags, production workers to adjust process parameters, in a timely manner to eliminate defects.
After 7, cut into single pole, the head of every batch of structural steel pipe should be strictly check system, check the weld mechanical properties, chemical composition, amalgamation, steel tube surface quality, and through the nondestructive flaw detection, ensure that qualified pipe process, can be formally put into production.
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