Advantages and disadvantages of spiral welded pipe

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Advantages and disadvantages of spiral welded pipe

Advantages of spiral welded pipe:
(1) Steel pipes of different diameters can be produced using strip steel of the same width, especially narrow strip steel can be used to produce large diameter steel pipes.
(2) Under the same pressure condition, the stress of the spiral welded seam is smaller than that of the straight seam, which is 75% to 90% of that of the straight seam welded pipe, so it can withstand greater pressure. Compared with the straight seam welded pipe of the same outer diameter, the wall thickness can be reduced by 10% to 25% under the same pressure.
(3) The size is accurate, the general diameter tolerance does not exceed 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 pipes, the loss of cutting head and tail is small, and the metal utilization rate can be increased by 6% to 8%.
(5) Compared with the straight seam welded pipe, its operation is flexible, and it is easy to change and adjust the variety.
(6) The equipment is light in weight and low initial investment. It can be made into a trailer-type mobile unit to directly produce welded pipes at the construction site where the pipeline is laid.
(7) It is easy to realize mechanization and automation.

The disadvantages of spiral welded pipe are: due to the use of rolled strip steel as raw material, there is a certain crescent curve, and the welding point is in the edge area of the elastic strip, so it is difficult to align the welding torch, which affects the welding quality. To this end, it is necessary to set up complex weld tracking and quality inspection equipment.