Ultrasonic Testing (UT) is a Non-Destructive Testing method used to detect internal flaws in materials using high-frequency sound waves.

During inspection, a probe sends ultrasonic waves into the material. When these waves encounter a defect or reach the back wall of the material, they are reflected back to the probe. The reflected signals are then analyzed based on their time and amplitude to identify and evaluate indications.

UT can also be used for thickness measurement, making it useful for assessing material thickness along with weld and component inspection.