Using the wet continuous method, the ink is applied to all surfaces of the component during magnetisation. The ink must be mixed thoroughly prior to use and must be kept agitated during testing. The Ink can be applied by spraying, immersion or flooding. When using the continuous magnetizing method, fix the part in the magnetizing unit, cover the surface quickly with 7HF Black spray, and immediately magnetize the part.Ĭomponents should be cleaned prior to testing to provide a suitable test surface. For permanently magnetized parts, shake can until agitator rattles cover surface with spray. First, make sure that the inspected surfaces are clean and dry. 7HF gives clear black indications when viewed in daylight.ħHF consists of a suspension of magnetic particles in a high flash petroleum distillate.Īerosol spray is the only possible method of application. Typical defects found include shrink cracks, welding defects, grinding cracks, quenching cracks and fatigue cracks. MAGNAVIS 7HF MPI Ink (black magnetic ink ) – 400 mlħHF is an oil based ready to use black ink for wet method magnetic particle testing.The ink is used in conjunction with suitable magnetising equipment to locate fine surface and slightly subsurface discontinuities in ferrous materials.
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