The workpiece must be magnetized in the test area. The discontinuity can be shown best if the magnetic field is vertical to the discontinuity.
There are various types of detection media: a suspension of coloured (including black) or fluorescent particles in a carrier fluid (based on water or oil), or dry powders. Fluorescent media usually gives the highest sensitivity.
The test area can be sprayed with a dry magnetic powder, or the workpiece can be dipped into a container in which the particles are kept afloat by air whirling (eddy pot procedure). The dry testing is recommendable where a wetting of the surface must be avoided, or with the examination of hot parts.
The magnetic powder is suspended in a carrier fluid. The particle size of the powder is smaller so that smaller discontinuities may be detected.
WET VISABLE METHOD
MR72 - Contrast Paint
MR76S - Magnetic Ink
MR71 - Paint Remover
WET FLOURESCENT METHOD
MR76F - Magnetic Powder Suspension - Fluorescent
DRY VISIBLE METHOD
MR230 - Magnetic Powder Red
MR232 - Magnetic Powder Green
MR233 - Dry Powder Yellow
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