Time of Flight Diffraction

The importance of welding in structures across all sectors of industry can't be overstated. Determining the quality of welds is often vital to the longevity and profitability of structures. Time-of-Flight Diffraction (TOFD) is an advanced NDT inspection method which is widely used for weld testing.

Time of Flight Diffraction (TOFD) is a reliable and fastest 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.

BISCO uses Omniscan from Olympus, Canada to carry out this effective technique. Omni Scan UT allows inspections simultaneously combining TOFD with conventional pulse echo. Pulse echo complements TOFD and covers the dead zones.