Advantages and Disadvantages of Spiral Submerged Arc Welded

Spiral submerged arc welded pipe seam was spiral distribution, weld length, especially in the dynamic conditions of welding, the weld was too late to leave the molding point, easy to produce hot welding cracks. The direction of the crack and the weld parallel, and the steel pipe axis into a certain angle, usually between 30-70 °. This angle is just consistent with the shear failure angle, so its bending, tensile, compression and torsional performance is far less than straight seam submerged arc welded pipe. At the same time due to welding position restrictions, the resulting saddle-shaped and fish-shaped welds affect the appearance. In addition, during the construction process, the spiral welded pipe at the node of the intersecting line welds split the spiral joints, resulting in a larger welding stress, thus greatly weakening the safety performance of components. Therefore, it is necessary to strengthen the weld seam weld seam nondestructive testing efforts to ensure the quality of welding, or in the case of important steel structure should not use spiral submerged arc welded pipe.

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