Investigation on the Imaging Law of Metal wire in Electrofusion Joint by Phased Array Ultrasonic Technique

The metal wires in electrofusion(EF) joint of polyethylene(PE) pipes will interfere the ultrasonic wave, which makes it difficult to detect the EF joint with traditional ultrasonic testing method. The phased array ultrasonic focusing technique as well as B-scan real image technology is used for testing the discontinuities of Electro-fusion joint with the metal wires. the imaging law of the metal wires is explored in the testing, and analyzed in terms of ultrasonic theory. The result shows: the arrangement, dislocation of the metal wire in the ultrasonic image can be used to detect the cold welding and over welding in EF joints.