Application of the EMAT for Ultrasonic Examination of Semi-Ready Products made of Aluminum Alloys

The article describes the possibility of application of electromagnetic-acoustic transducers (EMAT) for ultrasonic testing of aluminum alloy semi-finished products. The article evaluates the efficiency of detecting artificial and real discontinuity flaws using right and slant EMATs. The possibility of detecting defects in aluminum cakes featuring altogether 25 mm² equivalent area or more, with a safety margin of 15–20 dB with respect to structure generated noise. This can serve as a good background in creating a system for automated noncontact ultrasonic testing of aluminum alloy products and rough work pieces.
Keywords: ultrasonic inspection, electromagnetic acoustic transducer, aluminum-alloy casting.