Spiral steel pipe forming process:
1. Before spiral steel pipe forming: The spiral steel pipe adopts advanced double-sided submerged arc welding manufacturing process, which can be welded in position, and it is not easy to have defects such as misalignment, welding deviation and incomplete penetration, and it is easy to control the welding quality and position. The spiral steel pipe adopts a special welding process, which can be welded in the welding position without any errors or defects, which can ensure the qualification of the spiral steel pipe and the quality is well guaranteed.
2. During the forming of the spiral steel pipe: During the forming process of the spiral steel pipe, the steel plate should be deformed evenly, with small residual stress and no scratches on the surface. Therefore, the steel plate for making the spiral steel pipe should be carefully selected, and the surface should be uniform and without scratches. The processed spiral steel pipe has greater flexibility in the size specification range of diameter and wall thickness, especially in the production of high-grade thick-walled pipes, especially small and medium-sized thick-walled pipes, which has advantages that other processes cannot match, and can meet users' more requirements for spiral steel pipe specifications.
It should be noted that the weld gap should be controlled at 1~3mm, and the two ends of the weld should be flush.
1. If the gap is too large, the proximity effect will be reduced, the eddy current heat will be insufficient, and the intercrystalline bonding of the weld will be poor, resulting in unfused or cracked.
2. If the gap is too small, the proximity effect will be increased, the welding heat will be too high, causing the weld to burn; or the weld will form deep pits after extrusion and rolling, affecting the surface quality of the weld.
Spiral steel pipes are mainly used in tap water projects, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction.
