Magnetic Particle Crack Detection

Basic Knowledge of Crack Detection with Magnetic Particles

 


During the production of steel (casting), during the processing (rolling, forging, welding) and also during the utilization of steel components (bending and tensile loads) cracks can occur. Most often the crack formation begins at the surface and then the crack grows into the material due to stress concentrations at the crack tip. Finally, this can lead to a fatigue fracture of the component.
Therefore cracks are the most crucial defect type and must be eliminated by grinding out the crack or scrapping the complete component. The most sensitive method for the detection of surface cracks in ferromagnetic parts is magnetic particle testing (MT).

Main Applications

  • Safety relevant components in the automotive industry. Those are steering, axle and motor components in the state of half finished forged or cast products or in the final machined state.
  • Welds on pressure vessels and pipelines

Advantages of Crack Testing with Magnetic Particles

  • Highest sensitivity for the detection of surface cracks, also for complex object geometries
  • Clear and reproducible crack indications
  • Short testing time (approx. 10 s)
  • In general, no surface preparation required (oily surfaces must be cleaned before testing with water-based test media or tested in oil-based test media)
  • Detection of covered cracks below the surface
  • No particular radiation protection required
  • No special requirements concerning the operator’s expertise and skill. However, carefulness and permanent attention is needed.

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