Ultrasonic Testing (UT)
In Ultrasonic Testing (UT), high-frequency sound waves, created by a
vibrated crystal in probe, are transmitted into a material to detect
imperfections or to locate changes in material properties.
The most commonly used Ultrasonic Testing Technique is pulse echo,
whereby sound is introduced into a test object and reflections
(echoes) from internal imperfections or the part's geometrical
surfaces are returned to a receiver.
This method is very sensitive to detect crack type defects but
requires extensive training for operator to interpret the result.
Generally, in steel inspection, UT can be applied with different
levels, from plate up to node& nozzle.