Magnetic Crack Detection apparatus is designed to detect normally invisible cracks on or extending near to the surfaces of articles made of magnetic materials.
The design of magnetic crack - detectors is based on the principle that, if a crack or flaw is present in a magnetic material through which a magnetic field is passing, the lines of force will be distorted near the fault owing to the local change of permeability associated with it. In the case of a piece without any flaw, lines of force will be uniform an straight.
Cracks and flaws can also be detected by magnetizing a ferrous metallic part , then sprinkling very fine iron dust over it. The magnetic poles formed at the crack gather a line of dust and outline the crack. The special equipment for this magnetic testing for cracks is known as magnaflux.
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