(1) The spiral pipe raw material is a ribbon coil, a welding wire, and a flux. Strict physical and chemical testing is required prior to input.
(2) The steel head and the tail are butt jointed, and single or double-line submerged arc welding is adopted. After the steel pipe is rolled, automatic submerged arc welding is adopted.
(3) Before the forming, the strip is smoothed, trimmed, planed, surface cleaned and pre-bent.
(4) The electric contact pressure gauge is used to control the cylinder pressure on both sides of the conveyor to ensure the smooth conveying of the conveyor belt.
(5) The spiral tube is formed by external control or internal control roll forming.
(6) Weld control device is used to ensure that the weld meets the welding requirements, strictly control the pipe diameter, the misalignment and the weld gap.
(7) Both internal and external welding are performed by single or double wire submerged arc welding of American Lincoln welding machines to obtain stable welding specifications.
(8) The welds are all online continuous ultrasonic automatic injury detection to ensure non-destructive testing of 100% spiral welds. If there is a defect, the alarm will automatically alarm and spray, and the production worker can adjust the process parameters at any time to eliminate the defects.
(9) The spiral tube is cut into a single piece by an air plasma cutting machine.
(10) After cutting into a single steel pipe, each batch of steel pipes shall undergo a strict inspection system to check the mechanical properties, chemical composition, fusion state, surface quality and non-destructive testing of the steel pipe to ensure the pipe making process. After that, it can be officially put into production.
(11) The weld part with the continuous acoustic flaw detection mark, after manual ultrasonic and X-ray inspection, if it is defective, it will pass the non-destructive test again after the repair, until the defect is confirmed.
(12) The butt weld pipe of the strip and the butt joint that intersects the spiral weld are inspected by X-ray television or film.
(13) A hydrostatic test was performed on each of the spiral tubes, and the pressure was radially sealed. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Automatically print and record test parameters. The tube ends are machined to precisely control the end face perpendicularity, groove angle and blunt edge.
