Question

The typical wedge angle in TOFD inspection is:

A) greater than the first critical angle
B) greater than the second critical angle
C) perpendicular to the entry surface
D) smaller than the first critical angle

Answer 1

The typical wedge angle in TOFD inspection is smaller than the first critical angle.

Step-by-step explanation:

The typical wedge angle in TOFD inspection is smaller than the first critical angle. In TOFD (Time-of-Flight Diffraction) inspection, a wedge is used to introduce an ultrasonic beam into the material being inspected. The wedge angle needs to be smaller than the first critical angle to ensure that the ultrasonic beam is refracted and properly propagated through the material.