Ultrasonic Testing (UT) Level III


Ultrasonic testing uses the same principle as is used in naval SONAR and fish finders. Ultra-high frequency sound is introduced into the part being inspected and if the sound hits a material with a different acoustic impedance (density and acoustic velocity), some of the sound will reflect back to the sending unit and can be presented on a visual display. By knowing the speed of the sound through the part (the acoustic velocity) and the time required for the sound to return to the sending unit, the distance to the reflector (the indication with the different acoustic impedance) can be determined.

Topical Outline

1. Principles/Theory

2. Equipment Materials

3. Techniques/Calibrations

    • Contact
    • Immersion
    • Comparison of contact and immersion methods
    • Remote monitoring
    • Calibration (electronic and functional)

4. Interpretation/Evaluation

    • Evaluation of base metal product forms
    • Evaluation of weldments
    • Evaluation of bonded structures
    • Variables affecting test results
    • Evaluation (general)

5. Procedures

    • Specific applications
    • Codes/Standards/Specifications

6.Safety and Health

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