Spiral steel pipe is made by steel coil, extrusion forming under the normal temperature, then taken the technology of double wire and double-faced submerged-arc welded.
Spiral steel pipe, also known as spiral or helix spiral steel pipe, is a low-carbon steel or low-alloy structural steel strip at a certain helix angle (called molding angle) rolled into a tube, and the tube is made of welded joints It can be produced with a narrow strip of large diameter pipe.
During molding process of spiral welded steel pipe, steel plate has uniform deformation and light residual stress, thus the surface has no scratches. Spiral steel pipe has more flexible thicknesses and diameters, especially in making high-grade thick pipes with small or medium aperture, these techniques has incomparable advantages in satisfying your needs.
1. unwinding board probe: After entering the unwinding plate production line, the first full-board ultrasonic testing.
2. Leveling Milling: The flat steel anvil machine so that the original curl, and then through the edge milling machine for two-sided steel milling, so as to meet the requirements of the plate width, plate edge parallelism and groove shape.
3. shear molding: the steel plate production line along the outer edge of the spiral curl into a tube.
4. butt cut: double-sided submerged arc welding using advanced technology to pre-welding, internal welding, outside welding. Ion foot cut to specification length welded spiral pipe use and so on.
5. visual inspection: by professional and technical personnel to some of the basic parameters to be checked.
6. The ultrasonic flaw detection: internal and external weld and weld on both sides of the base material 100% inspection.
7. X-ray detection: internal and external welds 100% X-ray industrial TV check image processing system to ensure that the use of detection sensitivity.
8. The pressure test: the spiral steel pipe hydrostatic testing machine-by-root test to ensure that the pressure test pipe meet the required standards.
9. chamfering flat head: spiral steel pipe inspection carried out after the pipe end processing, to meet the requirements of the pipe end beveling size
10. Final inspection: ultrasonic and X-ray detection again and spiral steel pipe ends magnetic particle inspection, check if there are problems and welding pipe ends defects.
11. oiled marking: spiral steel pipe after passing were oiled to prevent corrosion, and according to user requirements for marking.
