Spiral steel pipe manufacturing process
2. Uncoiling
3. Rough Leveling
4. End Cutting and Butt Welding
5. Precision Leveling
6. Delivering
7. Forming By Inner and Outer Welding
8. Welding Slag Cleaning & Overall Inspection
9. repair Welding, X-Ray Inspection, Scanning, And Re-Inspection By Manual UT
10. Chamfering
11. Hydrostatic Testing
12. auto Length-Measuring and Weighing
13. Coating and Marking
14. storage
(1) Raw materials are steel coils, welding wire, and flux. Have to go through rigorous physical and chemical tests before investing.
(2) For the butt-end welding of steel strips, single-wire or double-wire submerged arc welding is used, and after the coils are made into steel pipes, automatic submerged arc welding is used to make up the welding.
(3) Before forming, the steel strip is leveled, trimmed, edged, surface cleaned and pre-flanged. (4) The electric 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.
(5) External control or internal control roll forming.
(6) The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, the amount of misalignment, and the weld gap are all strictly controlled.
(7) The inner and outer welds are all welded by single-wire or double-wire submerged arc welding using the Lincoln Electric Welder of the United States, thereby obtaining a stable welding specification.
(8) Welded welds were all inspected by an online continuous ultrasonic automatic flaw tester to ensure non-destructive testing coverage of 100% spiral welds. If there are defects, they will be automatically alarmed and painted. The production workers will adjust the process parameters at any time to eliminate defects in time.
(9) Using an air plasma cutter to cut the steel pipe into single pieces.
(10) After cutting into a single steel pipe, a strict first inspection system shall be carried out for each of the first three pipes of eac