Ultrasonic Testing (UT) is a non-destructive testing (NDT) method that uses high-frequency sound waves (above the range of human hearing, typically 0.5–50 MHz) transmitted into a material via a transducer (probe).

By analysing the reflected echoes from internal discontinuities - such as cracks, voids, or inclusions - UT allows the detection and localization of internal flaws, thickness measurement, and material characterization. The principle is similar to sonar or medical ultrasound and enables accurate inspection without damaging the component.

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