How can you distinguish between true indications and false indications in MPI?

The distinction between true indications and false indications in Magnetic Particle Inspection (MPI) is best achieved by examining the indications thoroughly and assessing their consistency with known flaws. This approach is essential because it requires a careful analysis of the indications produced during the inspection process, allowing the inspector to verify if the shapes, sizes, and locations of the indications correspond to established or expected defect patterns.

True indications typically indicate the presence of defects such as cracks, laps, or inclusions in the material, while false indications can arise due to non-relevant factors like surface roughness, dust, or magnetic leakage. Therefore, by analyzing whether the indications align with known flaw characteristics, inspectors can differentiate genuine defects from superficial or misleading indications.

This method emphasizes the importance of a systematic and knowledge-based evaluation rather than relying exclusively on personal experience or visual inspection techniques, which could overlook critical details or lead to misinterpretation of data.