Spiral seam submerged-arc welded pipe butt joint process

Abstract

The invention discloses a spiral seam submerged-arc welded pipe butt joint process and relates to the technical field of a spiral seam submerged-arc welded pipe. The process comprises the processing procedures of pipe end rounding, pipe end chamfering, steel pipe butt joint, prewelding, inner welding, outer welding, repair welding and circular seam nondestructive inspection. Compared with the traditional manual welding single-side welding double-sided forming process, the spiral seam submerged-arc welded pipe butt joint process has the advantages that the problems of welding quality stability influence and the like caused by great probability generation of defects such as air holes, slag clamping and cracks in the welding seam of the manual welding are solved, the butt joint quality and the efficiency of a steel pipe are greatly improved, the material consumption and the production cost can be greatly reduced, the field construction operation is convenient, and the batch production capability for producing butt joint pipes meeting API5L and relevant standard requirements is realized.

Description

technical field [0001] The invention relates to the technical field of spiral seam submerged arc welded pipes. Background technique [0002] The spiral submerged arc welded pipe is made by helically bending the steel coils according to a certain radius of curvature and then welding them together along the gap between the butt joints of the steel plates. Because the spiral seam submerged arc welded pipe has the advantages of low investment and many types of production, it has become the most widely used steel pipe manufacturing method in China. For spiral welded pipes, as the diameter and wall thickness of steel pipes continue to increase, the contradiction between the coil weight and the length of the steel pipe becomes increasingly prominent; if the coil weight deviates greatly from the ideal value, short-length pipes will inevitably be produced, resulting in a reduction in the yield. Moreover, in the production process, many steel pipes are downgraded because the length o...

AI Technical Summary

Problems solved by technology

For spiral welded pipes, as the diameter and wall thickness of steel pipes continue to increase, the contradiction between the coil weight and the length of the steel pipe becomes increasingly prominent; if the coil weight deviates greatly from the ideal value, short-length pipes will inevitably be produced, resulting in a reduction in the yield

And in the production process, many steel pipes are downgraded because the length of the steel pipes does not meet the standard due to reasons such as partial pipe body misalignment exceeds the standard, defect grinding wall thickness exceeds the standard, and base metal defects, which greatly reduces the yield

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