#ndt Ultrasonic testing is an NDT technology for detecting test piece discontinuities which may not be visible to the human eye. These defects can include cracks, corrosion, inclusions, porosity outside of specified tolerances, and voids. Ultrasonic testing devices pass ultrasonic sound waves into the test piece and measure the waves that reflect back to the device. The profile of the reflection is interpreted by software and the human operator to determine if the test piece is within spec.

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Source: NDT