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The Weld Length of Double-sided Submerged Arc Welded Spiral Steel Pipe
With the development of manufacturing technology of double-sided submerged arc welded spiral steel pipe, we should evaluate and compare comprehensively and correctly, and re-recognize the problem of long weld seam of spiral steel pipe. Firstly, the defect is parallel to the weld, so for spiral steel pipe, the defect of the weld is "oblique defect".
Firstly, the defect is parallel to the weld, so for spiral steel pipe, the defect of the weld is "oblique defect". In the process of using, the main stress direction of the spiral steel pipe, i.e. the equivalent defect length along the axis direction of the pipe is smaller than that of the straight seam pipe; secondly, the CVN value along the rolling direction can be three times higher than that perpendicular to the rolling direction because the pipeline steel is rolled steel plate and the impact toughness is anisotropic.
The principal stress on the straight seam pipe is just perpendicular to the direction of the lowest impact resistance of the pipe, while the spiral steel pipe staggers the direction of the lowest impact resistance of the pipe, so that the disadvantage of the weld length of the spiral steel pipe becomes the advantage.
