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What’s the Advantage and Limitation of Ultrasonic Testing?

advantages and limitations of ultrasonic testing

 

Ultrasonic testing is a very useful and versatile Non-destructive testing method. Some of the advantages of ultrasonic testing include:

  • It is sensitive to both surface and subsurface discontinuities.
  • The depth of penetration for flaw detection or measurement is superior to other NDT methods.
  • Only single-sided access is needed when the pulse-echo technique is used.
  • It is highly accurate in determining reflector position and estimating size and shape.
  • Minimal part preparation is required.
  • Electronic equipment provides instantaneous results.
  • Detailed images can be produced with automated systems.
  • It has other uses, such as thickness measurement, in addition to flaw detection.

As with all NDT methods, ultrasonic testing include also has its limitations, which include:

  • Ultrasonic testing has dead zone, the near surface cracks will be missed in thin steel plate.
  • Surface must be accessible to transmit ultrasound.
  • Skill and training is more extensive than with some other methods.
  • It normally requires a coupling medium to promote the transfer of sound energy into the test specimen.
  • Materials that are rough, irregular in shape, very small, exceptionally thin or not homogeneous are difficult to inspect.
  • Cast iron and other coarse grained materials are difficult to inspect due to low sound transmission and high signal noise.
  • Linear defects oriented parallel to the sound beam may go undetected.
  • Reference standards are required for both equipment calibration and the characterization of flaws.