Machining and manufacturing method for spiral weld defects of pipelines

Abstract

The invention discloses a machining and manufacturing method for spiral weld defects of pipelines. The machining and manufacturing method includes marking a metal plate which is required to be cut off and contains a spiral weld joint on the surface of a pipeline by a marking pen, and cutting off the metal plate containing the spiral weld joint by a cutting machine; machining a penetrating defect with a preset length and a preset width at the position corresponding to the spiral weld joint of the metal plate by means of cutting, grinding and polishing, then filling a brass strip with the size the same with that of the designed defect to the position with the defect, performing backing weld for two sides of the defect buried by the brass strip or one side of the opening defect, and performing filling welding until the shape of the metal plate is normal; and finally welding the metal plate containing the machined spiral weld defect onto the pipeline, and grinding excess weld metal of the weld joint welded back to the pipeline so as to complete machining and manufacturing for the weld defect. By the machining and manufacturing method, machining and manufacturing of the spiral weld defects with different sizes and at different positions can be performed, the machining and manufacturing method can be used for traction experiments, calibration of detectors and verification for performance indexes can be completed, and the accuracy of pipeline integrity assessment results is improved.

Description

technical field [0001] The invention relates to a method for processing and manufacturing a pipeline spiral weld defect. It relates to the technical field of piping systems. Background technique [0002] In-pipeline detection can detect the defects of pipelines under normal operation conditions, provide scientific basis for the prevention and maintenance of pipeline accidents, and play an important role in ensuring the safe operation of pipelines. The pull test of pipelines with defects is the basic method for the calibration of internal detectors and the verification of performance indicators, and the processing of artificial defects of different lengths, depths and widths is the key to the successful development of pull tests. [0003] At present, the electrochemical corrosion method is generally used in engineering to process corrosion defects of different sizes, and the technical means are relatively mature. For spiral weld defects, there are no mature processing metho...

AI Technical Summary

Problems solved by technology

For spiral weld defects, there are no mature processing methods at home and abroad for reference, which limits the development of pull tests for spiral weld defects, resulting in the inability to verify the performance of magnetic flux leakage detectors on spiral welds of different types and sizes. The detection probability and identification probability of defects, and the size judgment model of spiral weld defects cannot be established, which affects the identification and judgment of pipe spiral weld defects

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