MPI is one of the most commonly used forms of NDT for a number of reasons:
- Can be performed quickly and portably
- Is relatively inexpensive and doesn’t require stringent pre-cleaning
- Can be performed on large or small objects
- Indication of defects can be seen immediately
- Can be used to inspect components with irregular shapes (crankshafts, connecting rods etc), and on surfaces that have other materials on them
- Identifies surface and near surface defects (areas which concentrate stresses)
- Sensitive enough to detect shallow and fine cracks
