What can happen if residual magnetism is not removed after MPI testing?

When residual magnetism is not removed after Magnetic Particle Inspection (MPI) testing, it can lead to significant issues. The primary concern is that this residual magnetism may interfere with the proper functioning of the component. If a part retains magnetization, it can attract ferromagnetic contaminants, such as metal shavings or particles, which can compromise the integrity of the component and potentially lead to mechanical failure or function disruption.

Moreover, residual magnetism could cause false indications in future inspections, as these unwanted magnetic fields might mask or mimic actual flaws, making it difficult to accurately assess the component's condition. Thus, the presence of residual magnetism is detrimental and needs to be managed properly to ensure the reliability and safety of the inspected parts.