![Ultrasonic system uses high frequency sound energy to conduct
examinations and make measurements.
Ultrasonic examinations can be conducted on a wide variety of
material forms including castings, forgings, welds, and
composites.
ELECTRICAL ENERGY
SOUND ENERGY TRANSMIT & RECEIVE
“TRANSDUCER [PIEZOELECTRIC ELEMENT]”](https://image.slidesharecdn.com/l29ultrasonictestingprinciple-201103103924/85/L29-ultrasonic-testing-principle-7-320.jpg)
L29 ultrasonic testing principle
- 1. M.KARTHIKEYAN ASSISTANT PROFESSOR DEPARTMENT OF MECHANICAL ENGINEERING AAA COLLEGE OF ENGINEERING & TECHNOLOGY, SIVAKASI karthikeyan@aaacet.ac.in ME8097 NON DESTRUCTIVE TESTING AND EVALUATION
- 2. UNIT IV ULTRASONIC TESTING (UT) AND ACOUSTIC EMISSION (AE) 1. Ultrasonic Testing-Principle, 2. Transducers, 3. Transmission and pulse-echo method, 4. Straight beam and angle beam, 5. Instrumentation, 6. Data representation, A/Scan, B-scan, C-scan. 7. Phased Array Ultrasound, Time of Flight Diffraction. 8. Acoustic Emission Technique – Principle, 9. AE parameters, Applications
- 3. ULTRASONIC TESTING - PRINCIPLE
- 7. Ultrasonic system uses high frequency sound energy to conduct examinations and make measurements. Ultrasonic examinations can be conducted on a wide variety of material forms including castings, forgings, welds, and composites. ELECTRICAL ENERGY SOUND ENERGY TRANSMIT & RECEIVE “TRANSDUCER [PIEZOELECTRIC ELEMENT]”
- 9. ADVANTAGES Internal defects can be detected and sized when a validated procedure is applied Thick specimens take no more time to examine than thin ones, assuming correct instrumentation set up Access to only one side of the component is needed There is no radiation hazard in ultrasonic examination, and hence no disruption of work as there is with radiography Volumetric and crack like defects can be detected, irrespective of their orientation
- 10. DISADVANTAGES A high degree of operator skill and integrity is needed. Hence, the need for trained and certified NDT personnel In most examinations, there is no permanent record of the inspection as there is in radiography, however more recent equipment does offer this facility In certain materials, like austenitic steel, the large grain size found in welds can cause attenuation and this may mask defects Spurious indications, and the misreading of signals, can result in unnecessary repairs, which is why a validated procedure should be applied when carrying out any ultrasonic examination.