Manual Panasonic cq dfx444 (page 24 of 114) (English)

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DFX-444 Operator’s Manual Issue 3

The transducer/probe wedge is usually manufactured from a

polymer material so that the difference is sound velocity is large

enough to produce

the desired

refraction.

Angle beam or

shear wave testing

is most often used

for the inspection

of welds. The

reason for this is

to be able to

position the

transducer/probe

away from the

weld bead yet

propagate energy into the weld zone. Another reason to use angle

beam testing on welds is to position the sound beam more normal

to the expected discontinuities since the flaws in welds are usually

perpendicular to the test surface with the exception of porosity.

Figure 8 shows the principles of angle beam weld testing.

Depending on the incident angle, refracted sound beams can also

produce components of longitudinal energy, surface wave energy

and Lamb wave energy. Although these advanced topics are

beyond the scope of this manual, it is important to know that

multiple modes can occur simultaneously which may lead to

spurious indications. Surface wave inspection can be used to

detect cracks on the surface of materials.

NOTE: Angle beam testing is a more advanced ultrasonic testing

method. The user is advised to seek training and/or supervision in

the use of these methods for weld inspection.

Figure 8 – Typical Weld Inspection

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Panasonic cq dfx444 Manual

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