TOFD (Time of Flight Deffraction)
TOFD is an automated or manually encoded ultrasonic test method. It uses
a pitch catch arrangement with two probes, one on each side of the weld.
Angled longitudinal waves are used to insonify the weld material and inspect
for discontinuities. Applications
-The primary application is weld inspection, and is used on pressure
vessels, piping welds, etc. It can be used for both in service and newly
fabricated work.
-TOFD has excellent discontinuity sizing capability, so it is used for
discontinuity monitoring to determine growth rates. -TOFD is sensitive
to small discontinuities, and can be used to find and size small discontinuities.
-Code Case 2235 allows the use of TOFD in lie of radiography on newly
fabricated welds.
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