What are the advantages and disadvantages of spiral welded pipe？

Advantages of spiral welded pipe:
(1) Steel pipes of different diameters can be produced with the same width of strip steel, especially the large diameter steel pipes can be produced with narrow strip steel.
(2) Under the same pressure condition, the stress of spiral weld is smaller than that of straight weld, which is 75% - 90% of that of straight weld pipe, so it can bear larger pressure. Compared with the straight welded pipe with the same outer diameter, the wall thickness can be reduced by 10% ~ 25% under the same pressure.
(3) The size is accurate, the general diameter tolerance is not more than 0.12%, the deflection is less than 1 / 2000, and the ovality is less than 1%. Generally, the sizing and straightening process can be omitted.
(4) It can be produced continuously. Theoretically, it can produce infinitely long steel pipe. The loss of cutting head and tail is small, and the utilization rate of metal can be increased by 6% - 8%.
(5) Compared with the straight welded pipe, it is flexible in operation and convenient in variety adjustment.
(6) The equipment is light and the initial investment is small. It can be made into a trailer type flow unit, which can directly produce welded pipe at the construction site where the pipeline is laid.
(7) Easy to realize mechanization and automation.

The disadvantage of spiral welded pipe is that it is difficult to align the welding torch and affect the welding quality due to the use of coiling strip steel as raw material, certain crescent, and the welding point is in the elastic strip edge area. For this reason, it is necessary to set up complex weld tracking and quality inspection equipment.