Phased Array Ultrasonic Testing (PAUT)/Shearwave Ultrasonic Testing (SWUT)

Advantages of Phased Array Ultrasonic Testing

  • Used anywhere that conventional ultrasonic flaw detection can be used
  • Can be used to profile remaining wall thickness
  •  Uses multiple elements to steer, focus, and scan beams with a single transducer
  • Capable of beam steering to map components at appropriate angles in order to simplify the inspection of components with complex geometry without moving the probe.
  •  Small probe footprint
  • Capable of testing welds at multiple angles from a single probe to increase the probability of detecting anomalies
  • Electronic focusing permits optimizing the beam shape and size at the expected defect location
  • Ability to focus at multiple depths improves ability for sizing critical defects for volumetric inspection
  • Sensitive to small surface and subsurface anomalies
  • Penetration for flaw detection or measurement is greater to other methods
  • Single side access only required when using pulsed – echo technique is used
  • Minimal surface preparation required
  • Instant real time results
  • Does not have a radioactive source
  • Speed of examination is comparable to Radiography especially when performed in an
  • Automated configuration

 

Limitations of Phased Array Ultrasonic Testing

  • Expense of the system
  • Operator requires extensive training
  • Surface must be accessible to transfer sound
  • Requires a couplant medium
  • Rough, thin, complex geometry, small, exceptionally thin, or homogenous materials are difficult to inspect
  • Coarse grain materials are difficult to inspect due to low sound transmission and signal noise
  • Linear defects parallel to the sound path can be difficult to identify
  • Although the cost of PAUT/SWUT is greater than other available methods the speed of examination, ability of other work to continue in conjunction with the examination, and the safety factor of not having a radioactive source offsets the overall cost.