Ultrasonic Testing

September 11, 2019by adminaitc20190

Ultrasonic Testing is also a kind of Volumetric Test technique employed to detect flaws inside Cast/Forged components and weldments.

This technique uses ultrasound waves which cannot be heard by human being (0.1-15 MHz).

Ultrasonic waves are introduced into a material where they travel in a straight line at a constant speed until they encounter a surface/Flaw. At surface/flaw interface some/full of the wave energy is reflected and some is transmitted. The amount of reflected or transmitted energy can be detected and provides information about the size of the reflector/defect. The travel time of the sound can be measured and this provides information on the distance that the sound has traveled.

Now a day various types of methods & equipments are developed for Ultrasonic Testing like A-Scan, B-Scan, C-Scan, TOFD ( Time Of Flight Diffraction), Phased Array.

A-Scan is most common method used to detect flaws.

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  1. Depth of penetration for flaw detection or measurement is superior to other methods.
  2. Only single-sided access is needed when pulse-echo technique is used.
  3. High accuracy in determining reflector position and estimating size and shape.
  4. Electronic equipment provides instantaneous results.
  5. Detailed images can be produced with automated systems.
  6. Have other uses such as thickness measurements, in addition to flaw detection.


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