Ultrasonic testing is a sonic inspection procedure with a great advantage: installed components can be tested without removing them in the first place. It serves the detection of internal or external errors.
Workpieces that are inspected by ultrasonic testing must consist of sound-conducting materials. The procedure is based on the fact that ultrasonic waves spread with different speed depending on the medium and that they are reflected from so called interfaces. The procedure is used to test welding seams, sheet-metals, forgings and to measure wall thickness.
- The testing begins with the choice of the test head depending on the task and the character of the workpiece in question.
- A couplant (for example paste, gel, water or oil) is applied on the component’s surface to make sure that the test head is properly resting on it.
- The test head now glides over the surface. This can be executed manually, mechanically or automatically. The generated signal images which are displayed on the monitor show voids, inclusions, cracks and other anomalies.
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