Time of Flight Diffraction (TOFD) is a highly accurate advanced ultrasonic technique primarily used for the detection, location and sizing of weld discontinuities. Unlike conventional ultrasonic testing, which relies primarily on the amplitude of reflected sound, TOFD analyses diffracted ultrasonic signals generated at the tips of defects. This allows highly accurate measurement of defect height and provides valuable information for engineering assessment and fitness-for-service decisions. TOFD is particularly suited to critical weld examinations where accurate defect sizing, repeatability and a high level of inspection confidence are required.
