In MPI, what happens if the magnetic field is insufficient?

In Magnetic Particle Inspection (MPI), the adequacy of the magnetic field is crucial for the detection of surface and near-surface defects. When the magnetic field is insufficient, it fails to properly magnetize the material, which can lead to ineffective particle accumulation around defects. This situation results in false negatives, where actual defects go undetected because the magnetic field wasn't strong enough to draw the magnetic particles to the areas where defects are present.

Inadequate magnetization means that even if there are flaws in the material, the indicator particles may not cluster around those flaws, leading to the misleading conclusion that the material is free of defects. Proper magnetic field strength ensures that defects are highlighted adequately, enabling reliable inspection results.