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Spiral steel pipe, welded steel pipe production process

Spiral steel pipe, welded steel pipe production process

Is a strip of steel for the raw materials, often warm extrusion molding, automatic double-wire double-sided submerged arc welding of spiral welded steel pipe.
(1) raw materials that strip, wire, flux. In the input before going through a rigorous physical and chemical testing.
(2) the head and tail butt joint, using single or double wire submerged arc welding, after rolling into steel pipe using automatic submerged arc welding.
(3) Before forming, the strip is straightened, trimmed, planed, cleaned and delivered to the surface, and then subjected to bending.
(4) The use of electric contact pressure gauge control conveyor pressure on both sides of the pressure tank to ensure a smooth steel strip delivery.
(5) The use of external control or internal roller molding.
(6) The use of weld gap control device to ensure the weld gap to meet the welding requirements, pipe diameter, the amount of the wrong side of the weld gap are strictly controlled.
(7) The internal welding and external welding are using the United States Lincoln welding machine for single-wire or double-wire submerged arc welding, so as to obtain a stable welding specifications.
(8) Welded welds are inspected by ultrasonic automatic continuous online ultrasonic instrument to ensure the coverage of non-destructive testing of 100% spiral welded seam. If there are defects, automatic alarm and spray mark, the production workers so adjust the process parameters at any time, promptly eliminate defects.
(9) using air plasma cutting machine will be cut into single root.
(10) cut into a single pipe, the first batch of three steel pipe to the first inspection system to check the mechanical properties of the weld, chemical composition, melting conditions, the surface quality of steel and nondestructive testing to ensure that the pipe making process After passing, can formally put into production.
(11) Where there is a continuous ultrasonic flaw detection mark on the weld, after manual ultrasound and X-ray review, if defective, after repair, it shall undergo non-destructive inspection again until it is confirmed that the defect has been eliminated.
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