How are spiral seam steel pipes produced?

Spiral seam steel pipe is one of the steel pipe products we often see. So how is spiral seam steel pipe produced? Today, we walked into the production workshop of spiral seam steel pipes to give us a detailed understanding.

Spiral seam steel pipe is a spiral seam steel pipe made of strip steel coil as raw material, extruded at constant temperature, and welded by automatic double-wire double-sided submerged arc welding process. The specific production process is as follows:

1. The raw materials are steel strip coil, welding wire and flux. They must undergo strict physical and chemical inspections before being put into use.
2. For the head-to-tail butt jointing of steel strips, single-wire or double-wire submerged arc welding is used. After being rolled into steel pipes, automatic submerged arc welding is used for repair welding.
3. Before forming, the strip steel is leveled, trimmed, planed, surface cleaned, transported and pre-bent.
4. Electric contact pressure gauges are used to control the pressure of the cylinders on both sides of the conveyor, ensuring smooth conveying of the strip.
5. Adopt external control or internal control roller forming.
6. The weld gap control device is used to ensure that the weld gap meets the welding requirements. The pipe diameter, offset amount and weld gap are strictly controlled.
7. Both internal and external welding use American Lincoln welding machines for single-wire or double-wire submerged arc welding to obtain stable welding specifications.
8. All completed welds are inspected by an online continuous ultrasonic automatic flaw detector, ensuring 100% non-destructive testing coverage of spiral welds. If there is a defect, it will automatically alarm and spray mark, so that production workers can adjust the process parameters at any time to eliminate defects in time.
9. Use an air plasma cutting machine to cut the steel pipe into individual pieces.
10. After cutting into individual steel pipes, the first three steel pipes of each batch must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion status of the welds, the surface quality of the steel pipes, and non-destructive testing to ensure that the pipe making process is qualified. Only then can it be officially put into production.
11. The areas with continuous sonic flaw detection marks on the welds will undergo manual ultrasonic and X-ray re-examination. If there are indeed defects, they will be repaired and then undergo non-destructive inspection again until it is confirmed that the defects have been eliminated.
12. The pipes where the strip butt welds and the T-shaped joints that intersect the spiral welds are located have all been inspected by X-ray television or films.
13. Each steel pipe has undergone a hydrostatic pressure test, and the pressure is radially sealed. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Test parameters are automatically printed and recorded.
14. The pipe end is machined to accurately control the end face verticality, bevel angle and blunt edge.

After the editor’s careful explanation, we learned in detail the production process of spiral seam steel pipes. It turns out that the seemingly simple spiral steel pipe production process has such an important link.

Every qualified spiral seam steel pipe embodies the hard work and sweat of the workshop production and technical inspection workers. Watching the qualified spiral seam steel pipes being continuously transported to the construction site, I can’t help but respect the production workers of the steel pipe factory. This is Their precise operations produce excellent steel pipe products for us.