UT - Ultrasonic Inspection

UT - Ultrasonic Inspection

Ultrasonic inspection (UT) is one of the most widely used methods of nondestructive inspection. Its primary application in the inspection of metals in the detection and characterization of internal flaws; it is also used to detect surface flaws, to define bond characteristics, to measure the thickness and extent of corrosion.

Beams of high frequency sound waves are introduced into materials for the detection of surface and subsurface flaws in the materials. The sound waves travel through the material with some attendant loss of energy (attenuation) and are reflected at interfaces.

The reflected beam is displayed and then analyzed to define the presence and location of flaws or discontinuities.

Cracks, laminations, shrinkage, cavities, bursts, flakes, pores, disbonds, and other discontinuities that produce reflective interfaces can be easily detected.

Inclusions and other inhomogeneity can also be detected by causing partial reflection or scattering of the ultrasonic waves or by producing some other detectable effect on the ultrasonic waves.


  • Superior penetrating power which allows the detection of flaws deep in the part.
  • High sensitivity, permitting the detection of extremely small flaws
  • Greater accurancy in determining the position of internal flaws, estimating size, characterizing orientation, shape, and nature.
  • Only one surface need to be accessible.
  • Immediate interpretation, automation, rapid scanning, in-line production monitoring, and process control.
  • No effect on nearby personnel, equipment and material
  • Portability


  • Rough, irregular in shape, very small or thin parts are difficult to inspect.
  • Discontinuities that are present in a shallow lawyer immediately beneath the surface may not be detectable