Why linear defects oriented parallel to the sound beam may go undetected?
In ultrasonic testing the main disadvantage is that the linear defects oriented parallel to the sound beam may go undetected.
In this principle either the reflected or transmitted wave is captured and the distance from which it is reflected can be calculated.
If the defect lies parallel to the sound beam, then the defect will have no impact on sound beam and the wave travels parallel to the defect without being relected.
Hence the defect may go undetected.
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