Advantages and disadvantages of magnetic particle testing

The primary advantages and Disadvantages when compared to other NDT methods are:

ADVANTAGES

High sensitivity (small discontinuities can be detected).
Few material limitations (metallic and nonmetallic, magnetic and nonmagnetic, and conductive and nonconductive materials may be inspected).
Rapid inspection of large areas and volumes.
Suitable for parts with complex shapes.
Indications are produced directly on the surface of the part and constitute a visual representation of the flaw.
Portable (materials are available in aerosol spray cans)
Low cost (materials and associated equipment are relatively inexpensive)

DISADVANTAGES

Only surface breaking defects can be detected.
Only materials with a relatively nonporous surface can be inspected.
Pre-cleaning is critical since contaminants can mask defects.
Metal smearing from machining, grinding, and grit or vapor blasting must be removed.
The inspector must have direct access to the surface being inspected.
Surface finish and roughness can affect inspection sensitivity.
Multiple process operations must be performed and controlled.
Post cleaning of acceptable parts or materials is required.
Chemical handling and proper disposal is required.

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