1.The same width can be used for the production of various outer diameter tubing;
2. The piping is straight, the size is accurate, and the internal and external spiral weld increases the stiffness of the tube, so it is not necessary to adjust the size and straightening process after welding.
3.Easy to achieve mechanization, automation and continuous production;
4.Compared with other devices of similar scale, it is small, invests little and builds fast.
5.Compared with the same size of the longitudinal welded pipe, the weld length in the pipeline is longer and therefore has relatively low production efficiency.
Spiral welded pipe production process:
Spiral welded pipe raw material has strip and plate, and the thickness of the plate in more than 19 mm. Welding with automatic submerged arc welding, the equivalent of pipe body surface, the place where the lack of penetration in forming.After welding, and then repair welding in the surface of tube in vitro, and then to internal and external spiral seam welding. Board tape before entering the forming machine, must according to the pipe diameter, wall thickness and forming Angle will edge bending curvature, behind the forming and deformation curvature is consistent, in the middle of prevent weld zone of the "bamboo" defects. After bending into the spiral forming machine forming (see the spiral forming), welding. In order to improve the productivity, we adopt forming a pre welding line to match the multiple inside and outside the weld line. This can not only improve the quality of weld, and can greatly increase production. Preweld generally adopt welding speed faster gas arc welding or the protection of high frequency electric resistance welding,the welding adopts multipolar automatic submerged arc welding.
