This article is based on the leakage accident of the electrofusion joint in the polyethylene pipeline.First,phased array ultrasonic test is performed on the weld.Then,the tensile stripping test at the defective location of the electrofusion joint are carried out.At last,the failure mechanism of welded joints is analyzed.Researches show that the over welding caused the resistance wire area and the fusion area failure.Dislocation occurs in the resistance wire area caused polyethylene materials undergo massive chain scission reactions.The fusion area is not completely fused due to the dislocation of the resistance.Finally,suggestions are given for the on-site construction and inspection process of new pipelines.
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