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Refraction:
The change of direction suffered by wavefront as it passes obliquely
from one medium to another in which its speed of propagation is
altered.
Angle
Beams I
Angle Beam Transducers and wedges are typically used to introduce
a refracted
shear wave into the test material. An angled sound path allows
the sound beam to come in from the side, thereby improving detectability
of flaws in and around welded areas.
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