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5. NON-DESTRUCTIVE TESTING OF ATLAS BAR PRODUCTS 5.1 HOW DOES ULTRASONIC INSPECTION WORK?
Ultrasonic inspection normally involves the use of a piezo electric transducer which is both a transmitter and receiver of ultrasound. The transducer must be coupled to the item to be inspected, as ultrasound at the frequency used is not transmitted in air. Coupling of the transducer to the item under inspection may be achieved in two main ways: In the case of the contact inspection method a coupling medium (oil or wall paper paste, or similar) is used. The other common process used is immersion testing where the component or material under inspection is immersed in a water bath and ultrasound is transmitted through the water and into the component. (Corrosion inhibitors are normally added to the water bath where immersion testing is involved).
Initial Pulse
Back Wall Echo
Flaw Echo
Defect Back wall
Illustration of ultrasonic detection of impurities in a steel bar