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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 Application

• 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