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Spiral steel pipe classification: single-sided welding and double-sided welding

Spiral steel pipe is single-sided welding and double-sided welding, which is what we call single-sided submerged arc welding spiral pipe and double-sided submerged arc welding spiral pipe, spiral pipe for the molding process, we look at the more detailed explanation The
1, raw materials that are coil, wire, flux. In the investment before going through rigorous physical and chemical testing.
2, with steel head and tail docking, the use of single or double wire submerged arc welding, rolled into steel pipe after the use of automatic submerged arc welding.
3, before forming, strip through leveling, cutting edge, planing edge, surface cleaning and delivery to the edge of the treatment.
4, the use of electrical contact pressure gauge on both sides of the conveyor to control the pressure of the cylinder to ensure the smooth delivery of the strip.
5, the use of external control or internal control roll forming.
6, spiral pipe gap gap control device to ensure that the weld gap to meet the welding requirements, diameter, misalignment and weld gap are strictly controlled.
7, welding and external welding are used in the United States Lincoln welding machine for single or double wire submerged arc welding, in order to obtain a stable welding specifications.
8, the welding of the weld have been on-line continuous ultrasonic automatic injury inspection to ensure that 100% of the spiral weld non-destructive testing coverage. If there are defects, automatic alarm and spray marking, production workers at any time to adjust the process parameters, the timely elimination of defects.
9, the use of air plasma cutting machine to cut a single pipe.
10, cut into a single steel pipe, each batch of steel pipe must be a strict first inspection system, check the weld mechanical properties, chemical composition, melting conditions, steel pipe surface quality and after nondestructive testing to ensure that the pipe after passing , Can be formally put into production.
11, the seam has a continuous acoustic flaw marks on the site, after manual ultrasound and X-ray review, if there are defects, after repair, again after the nondestructive test until the defect has been confirmed to eliminate.
13, with the steel butt weld and spiral weld intersection of the Ding-type joints where the tube, all through the X-ray TV or film inspection.
14, each pipe through the hydrostatic test, the pressure using radial seal. Test pressure and time by the steel pipe hydraulic microcomputer detection device strictly controlled. Test parameters are automatically printed.
15, pipe end machining, so that the vertical face, bevel angle and blunt edge to be accurately controlled.

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