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What does TOFD mean?

Time of Flight Diffraction (TOFD) is a reliable method of nondestructive ultrasonic testing (UT) used to look for flaws in welds. TOFD uses the time of flight of an ultrasonic pulse to find the location of a reflector. It can also be used for weld overlays and the heat-affected zones of other components as well such as piping, pressure vessels, clad material, storage tanks, and structural steel.

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