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Title: Ultrasonic Inspection Of Polyethylene Butt-Fusion Joints
Author: L. J. House, Raymond A. Day
Source: American Gas Association 1982
Year Published: 1982
Abstract: Ultrasonic methods for quality assurance of heat-fused polyethylene butt joints in 4.0-inch diameter pipe were investigated in this study. These methods included pulseecho, pitch-catch and spectroscopic ultrasonic techniques. Pipe joint defects investigated were voids, inclusions, lack of bond, and incomplete fusion. The pulse-echo method, using a 2.25 MHz, cylindrically focused transducer, provided the best sensitivity 10 the butt-fused joint defects detecting flaws as small as 0.014-inch in diameter. No correlation was established between the ultrasonic spectroscopy results and the cohesive strength of incompletely fused joints in the 1.2 to 3.2 MHz frequency range.

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