UT is a non-destructive testing technique that uses beams of mechanical waves (vibrations) of short wavelength and high-frequency, transmitted from a small probe and detected by the same or other probes. Such mechanical waves can travel large distances in fine-grain metal, in the form of a divergent wave with progressive attenuation.
The technique detects internal, hidden discontinuities that may be deep below the surface. Transducers and coupling wedges are available to generate waves of several types, including longitudinal, shear and surface waves. Applications range from thickness measurements of thin steel plate to internal testing of large turbine rotors.
Most non-porous, resilient materials used for structural purposes (steel, aluminium, titanium, magnesium and ceramics) can be penetrated. Even large cross-sections can be tested successfully for minute discontinuities.
Ultrasonic testing techniques are widely accepted for quality control and materials testing in many industries, including electric power generation, production of steel, aluminium and titanium, in the fabrication of airframes, jet engine manufacture and shipbuilding.
At Testa all of our NDT technicians are qualified to industry recognised PCN (personnel certification in non-destructive testing) in accordance with BS EN ISO 9712.
Testa can provide PCN qualified technicians to carry out ultrasonic testing. The advantages of using ultrasonic testing include (but are not limited to) it is better than radiography at the detection of planar defects such as lock of fusion and cracks, it can determine the depth and position of defects, it is portable and easy to use on sites and in difficult areas of access, there are non of the health and safety problems associated with radiography and the result is available immediately.