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LIQUID PENETRANT TESTING.
MAGNETIC PARTICLE INSPECTION.
EDDY CURRENT TESTING.
ACOUSTIC EMISSION TESTING.
PAUT (Phased array ultrasonic testing).
TOFD ( Time of flight diffraction)
GUIDED WAVE TESTING.
ELECTROMAGNETIC ACOUSTIC TRANSDUCER TESTING.
Ultrasonic testing makes use of sound waves whose frequencies (50 kHz - 50 MHz) don’t listen by the human ear.
The piezoelectric material effect in the ultrasonic transducer makes it possible to transmit and receive from within the material. The ultrasonic probe makes it possible to inspect the internal material of the equipment and to detect thickness change, welds, cracks, voids, and other types of material or structural defects. The limitation of this method is that data acquisition and evaluation depends on the expertise of the engineer. This makes it difficult to come at nonsubjective readings and precision.