Spiral steel pipe production process

- Apr 04, 2018-

The raw material of spiral steel pipe is strip coiled steel plate as raw material, which is shocked and extrude into shape, and is welded to a spiral seam steel pipe with automatic double wire double-sided submerged arc welding process. Raw materials, ie coils, welding wires, and fluxes, are subjected to rigorous physical and chemical tests before being put into use. The heads and tails of the steel strip are butted together, and monofilament or double wire submerged arc welding is used. After the steel tubes are rolled, automatic submerged arc welding is used. Before forming, the steel strip is leveled, trimmed, edged, surface cleaned and pre-flanged, and an electrical contact pressure gauge is used to control the pressure of the compression cylinders on both sides of the conveyor to ensure the smooth delivery of the strip, using the control or Internal control roller molding, using weld gap control device to report weld gap to meet welding requirements, pipe diameter, misaligned amount, and weld gap are all strictly controlled. Both internal and external welds are made with Lincoln Electric Welder. Monofilament or double wire submerged arc welding, so as to obtain a stable welding specification, the welded welds are all inspected by an online continuous ultrasonic automatic flaw tester, which ensures the non-destructive test coverage of 100% spiral weld joints. glenflange
   If there are defects, they will automatically alarm and eject marks. The production workers adjust the process parameters at any time to eliminate defects in time. Using air plasma cutting machines, the steel pipes are cut into single pieces, and after cutting into single steel pipes, each batch of steel pipes needs to be processed. Strict first inspection system, the inspection of the mechanical properties of the weld, chemical composition, integration status, the quality of the rigid pipe surface and after passing the non-destructive inspection to ensure that the pipe manufacturing process is qualified, can be officially put into production. The site of the continuous sound wave inspection mark on the weld, after a manual ultrasonic X-ray review, if there is a defect, after repair, after a non-destructive test, until confirming that the defect has been eliminated, the strip weld and the spiral weld The intersection of the D-shaped street where the tube, all through the X-ray television or film inspection, no root pipe after hydrostatic pressure test, pressure radial seal, the test pressure of the time by the steel pipe pressure microcomputer testing equipment strictly controlled, test parameters Automatically print records, pipe end machining, so that the end face is vertical, groove angle and blunt edge are accurately controlled, spiral steel pipe flow chart spiral steel pipe and its standard classification, pressure fluid transport, spiral spiral submerged arc welded steel pipe SY5036-83, Mainly used for the transportation of petroleum and natural gas pipelines; High-pressure welded steel spiral joint pipe SY5038-83 for pressure-bearing fluids, welded by high-frequency lap welding, for high-pressure spiral-welded steel pipe for pressurized fluid transport, Strong pressure, good shaping, easy for welding and forming; General low-pressure fluid conveying, spiral submerged arc welded steel pipe SY5037-83 adopts double-sided automatic submerged arc welding Submerged arc welded steel pipes made of single-side welding method for general mortgage fluids such as water, coal gas, air and steam, are now generally divided into common standards for spiral steel pipes; SY/T5037-2000 (parts, also called ordinary fluid transport Spiral seam submerged arc welded pipe for pipelines), GB/T9711.1-1997 (GB, also called the first part of delivery technical conditions for oil and gas industry transmission steel pipe; A grade steel pipe to the current strict requirements of GB/T9711.2B grade steel pipe ), API-5L (American Petroleum Association, also known as pipeline steel pipe; which is divided into two grades of PSL1 and PSL2), SY/T5040-92 (spur spiral welded steel pipe). Spiral steel pipe Q235A, Q235B, 0Cr1, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mm, 20#, Q345, L245, L290, X4, X46, X70, X80,