Ultrasonic Shear Wave testing, also known as an angle beam inspection, is an ultrasonic testing technique that is great for weld inspections. A probe consisting of an ultrasonic transducer with a plastic or lucite wedge introduces an ultrasonic beam at an angle into the test area. As the probe is moved back and forth along the tested area, it can detect discontinuities in the weld based on the refraction of the ultrasonic beam.
Applications for Shear Wave UT testing:
- New construction weld inspection
- In service weld inspection
- Crack detection
- Crack/Flaw sizing
- Volumetric examination of forging or casting materials
Flaws that Shear Wave can detect:
- Weld flaws such as slag inclusion, lack of fusion, gas holes or porosity, surface connected and non-surface connected cracks, and incomplete penetration
- Erosion or corrosion such as pitting, material loss and root erosion
- Inherent discontinuities in forged or casting materials such as forging burst, laminations, cold shuts, hot tears, cavity defects, and inclusions
- Environmentally or process induced damage such as Hydrogen induced cracking (HIC), thermal fatigue cracking, caustic cracking and stress corrosion cracking
Advantages of Shear Wave Ultrasonic testing:
- Shear Wave UT is an established method, very common, and very effective for weld inspections.
- Testing can be performed with little or no disruption of nearby personnel that would have otherwise been caused if the same job was competed using X-Ray (RT) due to radiation hazards.