In ultrasonic testing, high-frequency sound waves are transmitted into a material to detect imperfections or to locate changes in material properties. The most commonly used ultrasonic testing technique is pulse echo, whereby sound is introduced into a test object and reflections (echoes) from internal imperfections or the part's geometrical surfaces are returned to a receiver. Adjacent image is an example of shear wave ultrasonic testing of a circumferential weld joint of pipe. The major indication is produced by sound reflected from a discontinuity within the weld.
Ultrasonic  Testing
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