Magnetic powder inspection steps and advantages and disadvantages
MAGNETIC PARTICLE INSPECTION IS PERFORMED IN FOUR STEPS:
- Induce a magnetic field in the specimen
- Apply magnetic particles to the specimen's surface
- View the surface, looking for particle groupings that are caused by defects
- Demagnetize and clean the specimen
ADVANTAGES OF MAGNETIC PARTICLE INSPECTION
- Can find both surface and near sub-surface defects
- Some inspection formats are extremely portable and low cost
- Rapid inspection with immediate results
- Indications are visible to the inspector directly on the specimen surface
- Can detect defects that have been smeared over
- Can inspect parts with irregular shapes (external splines, crankshafts, connecting rods, etc.)
LIMITATIONS OF MAGNETIC PARTICLE INSPECTION
- The specimen must be ferromagnetic (e.g. steel, cast iron)
- Paint thicker than about 0.005" must be removed before inspection
- Post cleaning and post demagnetization is often necessary
- Maximum depth sensitivity is typically quoted as 0.100" (deeper under perfect conditions)
- Alignment between magnetic flux and defect is important
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