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Time of Flight Diffraction (TOFD)

Time of Flight Diffraction is another ultrasonic testing technique that was originally designed as an alternative to the ultrasonic testing shear wave technique. A primary application for Time of Flight is sizing indications with much greater accuracy than other methods.

TOFD is typically used on parts where the geometry is congruent on both sides of the weld. For example, pipe-to-pipe welds or plate-to-plate welds where thickness is equal on either side of the weld, are a perfect situation to utilize time of flight diffraction. Lastly, it is important to note that thicker materials often receive multi-zone, focused applications to ensure proper inspection.

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