Spiral steel pipe is made of steel coils, extruded at room temperature, and then welded using a double-wire double-sided submerged arc welding process.
Spiral steel pipe, also known as spiral or spiral spiral steel pipe, is a strip of low carbon steel or low alloy structural steel rolled into a tube at a certain spiral angle (called forming angle), and the pipe is made of welded joints It can produce large diameter pipe with narrow strips.
Spiral welded steel pipe in the forming process, the steel plate deformation is uniform, the residual stress is small, and the surface is free of scratches. Spiral steel pipe has a more flexible thickness and diameter, especially in the manufacture of high-grade thick pipes with small and medium bore diameters, these technologies have unparalleled advantages in meeting your needs.

1、Release coil plate probe: After entering the release coil plate production line, the first full plate ultrasonic inspection is carried out.
2. leveling and milling: flat steel anvil machine makes the original rolled edge, and then double-sided milling of steel by edge milling machine to meet the requirements of plate width, plate edge parallelism and groove shape.
3. Shear forming: the steel plate line is spirally curled into a tube along the outer edge.
4. Butt cutting: Double-sided submerged arc welding using advanced technology for pre-welding, internal welding and external welding. Ion foot cutting into specification length welded spiral pipe use, etc.
5. Appearance inspection: Some basic parameters are inspected by professional technicians.
6. Ultrasonic flaw detection: 100% flaw detection on both sides of the inner and outer welds and weld seams of the base material.
7. X-ray inspection: 100% X-ray industrial TV inspection image processing system for internal and external welds to ensure the use of detection sensitivity.
8. Pressure testing: Spiral steel pipe hydrostatic testing machine test pressure one by one to ensure that the test pressure pipe meets the required standards.
9. chamfering and flush head: spiral steel pipe is inspected after processing at the pipe end to meet the bevel size requirements of the pipe end
10. Final inspection: ultrasonic and X-ray flaw detection and spiral steel pipe end magnetic particle flaw detection again to check if there are problems and defects in the welded pipe end.
11. Oiling and marking: after passing the spiral steel pipe oiled to prevent corrosion and marked according to user requirements.

Longitudinal production process is simple, efficient, low cost, and faster development. Spiral longitudinal welding is generally higher than it can be produced with a narrow billet of large diameter pipe, but also with the same width of the billet to produce different pipe diameters. However, compared with the same length of straight seam pipe, the weld length is reduced by 30 to 100%, and the productivity is lower. Therefore, the small diameter pipe is mostly straight seam welded, and the large diameter is mostly spiral welded pipe.

Spiral steel pipe is mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction, and is one of the twenty key products developed in China.
For liquid conveying: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural use: piling pipe, bridge; dock, road, building structure pipe, etc.