Spiral Pipe Manufacturer: Production Process of Spiral Pipes
Release date:
2022-08-15
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According to the manufacturer, spiral pipes can be categorized into several types based on their production process, including spiral-welded steel pipes, plastic-coated steel pipes, and straight-seam steel pipes. They are manufactured from steel coil stock and produced through a double-sided welding process, resulting in a circular steel pipe. The manufacturing of spiral pipes remains quite complex, involving numerous steps. So, what are the key stages in the production of spiral pipes? Let’s take a look!
Spiral pipe manufacturer It is classified into various types—such as spiral-welded steel pipe, plastic-coated steel pipe, and straight-seam steel pipe—depending on the manufacturing process. These pipes are produced from steel coil stock and undergo a double-sided welding process to form a circular steel tube. The production of spiral pipes remains quite complex, involving numerous steps. So, what are the key stages in the fabrication of spiral pipes? Let’s take a look!
1. Before putting the equipment into operation, raw materials such as strip coils, welding wire, and flux must be tested.
2. The ends of the steel strip are welded using single‑wire or double‑wire submerged arc welding, and after rolling into a steel pipe, automatic submerged arc welding is employed for repair welding.
3. Prior to forming, steel plates shall be straightened, trimmed, planed, cleaned, transported, and bent.
4. The electrical contact pressure gauge is used to regulate the pressure in the hydraulic cylinders on both sides of the conveyor, ensuring smooth strip steel conveyance.
5. The spiral pipe manufacturer states that forming is carried out using either external‑control or internal‑control rollers.
6. A weld gap control device is employed to ensure compliance with weld gap and welding requirements, thereby minimizing pipe diameter variation, dimensional errors, and weld gap deviations.
7. Both the internal and external welds are performed using single- or double-wire submerged arc welding, ensuring stable weld quality.
8. All welds are inspected using automated ultrasonic testing equipment, ensuring 100% coverage of spiral welds. Any defects trigger an automatic alarm and are marked with a spray‑on identifier, enabling production personnel to adjust process parameters in real time and promptly address defects.
9. The spiral pipe manufacturer states that air plasma cutting machines are used to cut steel pipes into individual lengths.
10. If any ultrasonic testing indications are detected on the weld, the weld shall be re-inspected using manual ultrasonic testing and radiographic examination. Any defects found shall be repaired, followed by nondestructive testing, until it is confirmed that all defects have been eliminated.
Main development directions of spiral tubes:
1. To enhance the pressure resistance of spiral welded pipes and improve their primary pressure-bearing capacity, large-diameter thick-walled pipes have been manufactured.
2. Develop new steel grades, optimize smelting processes, and produce high‑quality welded spiral‑welded pipes; extensively implement controlled rolling and post‑rolling heat‑treatment techniques to continuously enhance the strength and toughness of both the pipe body and the welds.
3. Vigorously promote the use of coated pipelines; for example, applying an anti-corrosion coating to the inner wall not only extends the pipeline’s service life but also enhances the smoothness of the inner surface, reduces fluid friction, minimizes wax deposition, decreases the frequency of pigging operations, and lowers maintenance costs.
4. Spiral pipe manufacturers state that newly designed steel pipes, such as double‑helix steel pipes—welded from thin‑walled, semi‑thick steel plates—not only exhibit higher strength than single‑layer pipes of the same thickness but also avoid brittle fracture.
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