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  • Magnetic Particle Inspection

    MPI is a NDT technique for detecting surface and subsurface discontinuity in ferromagnetic materials such as iron, nickel, cobalt and some of their alloys. We offer on-site magnetic particle inspection services using yoke type, prod type and coil type magnetizing equipment; dry powder, wet magnetic particles & wet fluorescent magnetic particle technique.

    Applications:
    • Most weld discontinuities open to or near the surface
    • Most suitable for cracks, laps, seams, voids, pits, subsurface holes, and other surface or slightly subsurface, discontinuities in ferromagnetic materials
    Advantages:
    • Relatively economical and expedient
    • Test equipment is considered portable
    • Unlike liquid penetrant, magnetic particle can detect some near surface discontinuities
    • Can inspect through thin coatings
    Limitations:
    • Application only to ferromagnetic materials as well as to surface or near-surface flaws
    • Parts should be clean before and after inspection
    • Thick coatings may mask rejectable indications
    • Some applications require parts to be demagnetized after inspection
    • Magnetic particle test requires use of electrical energy for most applications
    • Some potential for arc strikes on surface