Magnetic particle inspection is a method that can be used to find surface and near surface flaws in ferromagnetic materials such as steel and iron. The technique uses the principle that magnetic lines of force (flux) will be distorted by the presence of a flaw in a manner that will reveal its presence. The flaw (for example, a crack) is located from the "flux leakage," following the application of fine iron particles to the area under examination. There are variations in the way the magnetic field is applied, but they are all dependent on the above principle.
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