Production Technology of Coating Sprial Welded Steel Pipe

Spiral welded steel pipe production process

1. The raw material is steel strip coil, wire, flux. Have to pass strict physical and chemical inspection before investment.

2. The head and tail docking strip steel, the use of single or double wire submerged arc welding, after rolled steel tube adopts automatic submerged arc welding repair welding.

3. Before forming, strip after flattening, cutting edge, edge planing, transmission and cleaning the surface to the flanging process.

4. On both sides of the electric contact pressure gauge control conveyor under the pressure of oil cylinder pressure, ensure the smooth delivery of strip steel.

5. The use of external control or internal control roll forming.

6. The weld gap control device to ensure that meet the requirements of welding seam clearance, pipe diameter, the wrong side of the amount and weld gap are tightly controlled. 7. Welding and welding are used within the United States Lincoln welding machine for single or double wire submerged arc welding, to obtain the stable welding specification.

8. After welding the weld passes the online continuous ultrasonic automatic meter check, ensure the spiral weld nondestructive testing coverage of 100%. If there are defects, automatic alarm and spray tags, production workers to adjust process parameters, in a timely manner to eliminate defects.

9. The air plasma cutting machine to cut the steel tube into single.

After 10. Cut into single pole, the head of every batch of mild steel pipe should be strictly check system, check the weld mechanical properties, chemical composition, amalgamation, carbon steel pipe surface quality, and through the nondestructive flaw detection, ensure that qualified pipe process, can be formally put into production.

11. A continuous acoustic detection mark in the weld area, after manual ultrasonic and X-ray check, if there are defects, after repair, again through the nondestructive inspection, until defects have been eliminated.

12. Strip steel butt weld and fellowship with spiral weld d joint in the tube, all pass X-ray films and television inspection.

13. Each carbon steel pipe after hydrostatic pressure test, radial sealing for the pressure. Test pressure and time are controlled strictly by steel pipe hydraulic microcomputer testing device. The parameters automatically printed out.

14. The pipe mechanical processing, make the end verticality, slope Angle and the blunt edge to get accurate control.

Spiral steel pipe is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, is one of 20 key products of our country's development. For liquid transportation, water supply and drainage. For gas, gas, steam, liquefied petroleum gas. For structure: piling pipe, bridge; Dock, road, building structural steel pipe, etc.

More information,pls visit:Hunan great steel pipe co.,ltd