Ultrasonic Flaw Detection
Ultrasonic Flaw Detection is a non-destructive testing (NDT) method in which
tested are used to detect surface and sub-surface flaws. The sound waves travel
through the materials with some attenuation of energy and are reflected at
interfaces. The reflected beam is detected and analyzed to define the presence
and location of flaws.
Ultrasonic waves are almost completely reflected at metal gas interfaces. Partial
reflection occurs at metal liquid or metal solid interfaces, with the specific
percentage of reflected energy depending mainly on the ratios of certain
properties of the matter on opposite sides of the interface.
Cracks, laminations, shrinkage, cavities, bursts, flakes, pores, bonding faults and
other discontinuities that can act as metal-gas interfaces can be easily detected.
Inclusions and other inhomogeneity in the metal being inspected can also
detected by causing partial reflection or scattering of the ultrasonic waves, or by
producing some other detectable effect on the ultrasonic waves.
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