T.O. 33B-1-1
1-55
1.8.1.5
Angle Beam Blocks.
There are two types of angle beam calibration blocks included in TA 455: the miniature block and the International
Institute of Welding (IIW) block Type 2 (see Figure 1-11). Either of these blocks may be used to perform the following
for angle beam transducers: check the refracted angle of the sound beam, check the point-of-incidence of the refracted
sound beam and calibrate the sweep of the ultrasonic instrument. Note also within these paragraphs are procedures for
characterizing and calibrating straight beam transducers. Angle beam blocks made of aluminum and steel are
standard. Other materials may be specifically ordered. Shear wave velocities for titanium and aluminum are close so
aluminum blocks may be used for shear wave inspection of titanium. However, adjustments in distance calibration may
have to be made.
