A computer for flaw plotting

Ultrasonic vibrations provide the only known physical means for the non-destructive examination of thick sections of dense materials. The basic method is simple; the equipment is relatively inexpensive, and there is no hazard to operating personnel. Ultrasonics will not completely supplant the older, established techniques of radiographic, magnetic, or dye inspection methods, but it will do inspection jobs which cannot be done by any of these methods. The most commonly used ultrasonic inspection method at the present time is the “contact” method, where the transducer is pressed directly against the surface of the part to be inspected. This is not a method readily adapted to mechanized scanners. The mechanized scanner proceeds in an orderly manner, and avoids the repetitive scanning generally required by the manual method to assure complete coverage.