Magnetic Particle Inspection
To find flaws on the surface or just below the surface, magnetic particle inspection is used. This type of inspection can only be used on iron-based, ferromagnetic metals, such as iron, steel, cobalt and nickel. Ferromagnetic alloys used in the casting must contain enough of the magnetizeable material for this type of inspection to be effective.Flux, or magnetic lines of force, gets distorted when it attempts to pass thru a flaw. Thus this “flux leakage” follows the application of infinitesimal particles of iron to the part of the casting that is being examined. There might be some differences in the application of the magnetic field, but the principle of magnetic particle inspection is the same for all applications.
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