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Quality and Inspection Process Knowledge
Quality and Inspection Services
Ultrasonic inspection is an NDI technique that uses sound energy
moving through the test specimen to detect flaws. The sound energy passing
through the specimen will be displayed on a Cathode Ray Tube (CRT), a Liquid
Crystal Display (LCD) computer data program, or video/camera medium. Indications
of the front and back surface and internal/external conditions will appear as
vertical signals on the CRT screen or nodes of data in the computer test
program. There are three types of display patterns; “A” scan, “B” scan,
and “C” scan. Each scan provides a different picture or view of the specimen
being tested.
The amount of reflection that occurs when a sound wave strikes
an interface depends largely on the physical state of the materials forming the
interface and to a lesser extent on the specific physical properties of the
material. For example: sound waves are almost completely reflected at metal/gas
interfaces; and partial reflection occurs at metal/liquid or metal/solid
interfaces.
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