(12) strip steel butt weld and fellowship with spiral weld d joint in the tube, all pass X-ray films and television inspection.

(14) pipe end machining, make the end verticality, slope Angle and the blunt edge to get accurate control.

(5) the use of external control or internal control roll forming.

(4) on both sides of the electric contact pressure gauge control conveyor under the pressure of oil cylinder stainless steel shower set pressure, ensure the smooth delivery of strip steel..

(8) after welding the weld passes the online continuous ultrasonic automatic meter check, ensure the spiral weld nondestructive testing coverage of 100%. Have to pass strict physical and chemical inspection before investment.

(2) the strip head to tail docking, use single or double wire submerged arc welding, after rolled steel tube adopts automatic submerged arc welding repair welding.

(9) by air plasma cutting machine to cut the steel tube into single.

(3) before shaping, strip after flattening, cutting edge, edge planing, transmission and cleaning the surface to the flanging process.

(7) welding and welding are used within the United States Lincoln welding machine for single or double wire submerged arc welding, to obtain the stable welding specification. Test pressure and time are controlled strictly by steel pipe hydraulic microcomputer testing device.

(11) 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. Spiral pipe has one side welding and welding by both sides, welded pipe shall ensure that the water pressure test, the tensile strength and cold bending properties of the weld in accordance with regulations.Spiral steel pipe is mainly used in oil, natural gas pipeline, its specifications expressed in diameter * wall thickness. If there are defects, automatic alarm and spray tags, production workers to adjust process parameters, in a timely manner to eliminate defects. The parameters automatically printed out.

(13) each steel pipe after hydrostatic pressure test, radial sealing for the pressure.

Production process:

(1) the raw material is steel strip coil, wire, flux.

After cut into single pole (10), the head of every batch of steel pipe should be strictly check system, check the weld mechanical properties, chemical composition, amalgamation, steel tube surface quality and the nondestructive flaw detection, ensure that qualified pipe process, can be formally put into production.

(6) the weld gap control device to ensure that meet the requirements of welding seam clearance, pipe diameter, and quantity of the wrong side of weld gap are tightly controlled

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