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Ultrasonic Testing.


Ultrasonic Testing, also known as UT, is a method of characterizing the thickness or internal structure of a test piece through the use of high frequency sound waves.

UT utilises transmission of very high-frequency sound waves into a material to detect discontinuities or to locate changes in material properties.


The most commonly used ultrasonic testing technique is pulse echo, wherein sound is introduced into a test object and reflections (echoes) are returned to a receiver from internal discontinuities or from the part's geometrical surfaces.

Ultrasonic Inspection is a very useful and versatile NDT method. Some of the advantages of ultrasonic inspection that are often cited 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.

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