By analyzing the weld structure formed by different welding processes of polyethylene pipes,understanding the mechanism of corresponding welding defects,and selecting different ultrasonic testing processes based on the shape of each formed weld seam.For the detection of electric fusion welded joints,phased array ultrasonic testing technology is adopted to optimize the process parameters of sensitivity,scanning aperture,and focusing depth to improve detection efficiency.Using TOFD testing method for hot melt welded joints,selecting appropriate TOFD wedge material and specifications to improve detection resolution.
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