Ultrasonic Testing

Ultrasonic Testing

Ultrasonic testing (UT) techniques are based on the propagation of ultrasonic waves in the object or material tested. In most common UT applications, very short ultrasonic pulse-waves are transmitted into materials to detect internal flaws or to characterize materials.

This technique uses ultrasound waves that cannot be heard by human beings (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 are 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.

Ultrasonic testing is often performed on steel and other metals and alloys. It is used in many industries including steel and aluminum construction, metallurgy, manufacturing, aerospace, automotive, and other transportation sectors. Patels Radiography Services provides

  • UT with recording
  • UT with B-scan
  • Ultrasonic Thickness Measurement


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


Patels Radiography Services
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