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Ultrasonic Testing

Control by ultrasonic method (UT) is based on the propagation of elastic waves through the component under examination and monitoring the transmitted signal (Technique for Transmission) or the reflected signal or any surface or discontinuity (Technique for Reflection).

Ultrasounds are, therefore, elastic waves of mechanical type, transmitted in solid bodies (or in liquids for immersion techniques) to produce in their molecules elastic oscillations around the equilibrium position.

The nondestructive ultrasonic system finds application in the inspection of the welds and mechanical components (shafts, axles, pins) and is useful to verify the presence of inclusions in rolled products; it finds also application for the measurement of thickness.

The ultrasonic method is performed on industrial structures and systems used in the public and private transport.

Normative references of the magnetic particle method are:

  • UNI EN 10228-3: Control of ferritic or martensitic steel forgings
  • UNI EN 10228-4: Control of forgings of ferritic-austenitic stainless steel
  • UNI EN 583-1: General principles
  • UNI EN 583-4: Examination of discontinuities perpendicular to the surface
  • UNI EN 583-5: Characterization and sizing of discontinuities
  • UNI EN ISO 11666: Levels of acceptability for ultrasonic welds full penetration
  • UNI EN ISO 17640: Control techniques, levels of testing and evaluation
  • UNI EN ISO 23279: Characterization of indications in welds
  • UNI EN 10160: Control of flat steel products with thickness more than 6 mm (reflection method)
  • UNI EN 14127: Measurement of thickness by ultrasound

For more information please download the attached document.