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What is ultrasonic testing?

Ultrasonic (UT) inspection is a method of characterizing the thickness or internal structure of a piece using high-frequency sound waves. The frequencies used for ultrasonic testing are many times higher than the limit of human hearing, most commonly in the range from 500 kHz to 20 MHz. It is utilized in a comparative mode, where a real component is compared to a calibration/test piece where several types of defects have been included.

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