What material do you inspect in a mag particle inspection?

What material do you inspect in a mag particle inspection?

• A. Nonferrous
• B. Ferroelectric
• C. Ceramic
• D. Ferrous

Answer: (D)

Magnetic particle inspection works by magnetizing the part and using magnetic particles to reveal leakage fields at defects. Only ferrous (ferromagnetic) materials—like iron, steel, nickel, and cobalt—can be magnetized strongly enough for this method to make flux leakage visible. Nonferrous materials (aluminum, copper, titanium, etc.) don’t retain a magnetic field in the same way, so MPI isn’t effective for them. Some stainless steels are weakly magnetic, but the standard practice is to inspect ferrous materials with MPI.

Magnetic particle inspection works by magnetizing the part and using magnetic particles to reveal leakage fields at defects. Only ferrous (ferromagnetic) materials—like iron, steel, nickel, and cobalt—can be magnetized strongly enough for this method to make flux leakage visible. Nonferrous materials (aluminum, copper, titanium, etc.) don’t retain a magnetic field in the same way, so MPI isn’t effective for them. Some stainless steels are weakly magnetic, but the standard practice is to inspect ferrous materials with MPI.