Ultrasonic testing method uses sound waves of short wavelength and at a high frequency to detect flaws or measure material thickness. It is used to test welds, castings and wrought products such as rolled plate or forgings.

The detection and location of discontinuities are enabled by the interpretation of ultrasonic wave reflections generated by the transducer.

The information gotten from the ultrasonic inspection can be presented in a number of formats:

• A-Scan displays the amount of received ultrasonic energy as a function of time
• B-Scan displays a profile view (cross-section) of a specimen
• C-Scan displays a plan type view of specimen and discontinuities