An ultrasonic flaw detector is a non-destructive testing device that uses high-frequency sound waves to detect and locate internal defects in materials such as metals, plastics, and composites.

​

The device works by emitting ultrasonic waves into the material being tested. These waves travel through the material until they encounter a boundary between two different materials or a defect such as a crack or void. When the waves encounter a boundary or defect, they are reflected back to the detector, which records the time it took for the waves to return.

 

The device then uses this information to create an image of the internal structure of the material being tested. Ultrasonic flaw detectors are commonly used in manufacturing, process, and service industries to detect hidden cracks, voids, porosity, and other internal discontinuities in metals, composites, plastics, and ceramics.