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NDT Non Destructive Testing of off-highway service wheels


Non-destructive testing (NDT) for detection of cracks in Wheels by Bearcat.

NDT testing in wheels in wheels is vital to reduce the possibility of catastrophic failures through cracking, corrosion and erosion. Regular maintenance plans that include checks after defined hours in service will help with early crack detection.

For the testing of cracks in wheels, bearcat works under the Australian standard AS4457-1997 Earthmoving machinery – off highway rims and wheels – maintenance and repair.

For full transparency we use a certified independent NDT Company to perform our work who is accredited for technical competence via NATA certification.

The technique they use is a fluorescent magnet ink smart-check (MPI Fluoro) in conjunction with a Labino H135 fluorescent spotlight and ferrous probe electromagnet (Yoke Type). A Burmah Castrol Flux Density Indicator is used to ensure adequate field strength prior to testing.

We have found this is the best procedure as it offers greater sensitivity in comparison to alternative colour contrast methods. This is due to the dramatic contrast between the bright glowing image of a defect and the darkened environment, which ensures the virtual disappearance of the remainder of the surface under inspection. The result is increased probability of detection of defects.

Our process includes:

Procedure documentation includes:

  • Rim identification number (Customer and Bearcat). Size and configuration, Colour or specific customer instructions.
  • Washing the wheel and associated parts.
  • Abrasive blast wheel and associated parts.
  • Wheels and parts moved to a special dark area.
  • UV light testing done as by NATA approved personnel.
  • Wheels and parts marked ‘pass – fail’ accordingly.
  • Failed areas marked on Wheels for customer notification.
  • Failed wheels moved to quarantine area and stamped with serial number and assembled.
  • Passed wheels washed, painted, stamped with serial number and assembled.
  • Report and certificate issued.