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MAGNETIC PARTICLE INSPECTION -DESCRIPTION OF METHOD

This method involves the magnetisation of an area to be examined and the application of ferromagnetic particles to the surface. The particles gather at areas of magnetic flux leakage and form indications characteristic of the type of discontinuity detected.Maximum sensitivity is achieved when linear discontinuities are oriented perpendicular to the lines of flux.The AC electromagnetic yoke technique is restricted to the detection of surface breaking discontinuities.