Advantages of Disadvantages of Spirally Welded Pipes

    The advantages of spirally welded pipes production are:

    (l) Using steel strips of the same width can produce steel pipes of different diameters.

    (2) Spirally welds are less stressful than straight seams, being only 75-90% of straight seam welded pipes, and are therefore able to carry larger pressures. Compared with the straight welded pipe of the same diameter, the wall thickness can be reduced by 10-25%. From the material mechanics point of view, a thin-walled circular tube (such as the oil pipeline), when it is subjected to internal pressure radial stress & c is the axis Twice the stress &l (see Equation 15-4.5.). Therefore, the radial stress is the decisive factor in determining the wall thickness. The tangent of the spiral weld seam forms an angle α with the longitudinal straight line on the surface of the tube body (ie, the parallel line on the surface of the cylinder axis). It is called forming angle.

    (3) The size is correct, generally, the diameter tolerance is not more than 0.12%, the deflection is less than 1/2000, and the ellipticity is less than 1%. Generally, the sizing and the straightening process can be omitted.

    (4) Continuous production: Theoretically, it is possible to produce steel pipes without infinite length. The loss of cutting and cutting tails is small, and the utilization factor of metals can be increased by 6 to 8%.

    (5) Flexible operation, easy to change the type of the product (compared with the straight seam welded pipe).

    (6) The equipment is light in weight and the initial investment is small. Some units make a flow and can be produced directly on the pipeline construction site.

    (7) It is easy to realize urbanization and automatic production.

    The disadvantages of spirally welded pipe production are: due to the use of rolled steel as the material, there is a larger crescent of the crescent, and the welding point is in the region of the edge of the strip with elasticity, so it is not easy to align the welding torch, affecting the welding quality. For this purpose, complex weld seam tracking and quality inspection equipment needs to be set up.

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