During inspection, how often should the magnetic field strength be checked?

The correct response indicates that the magnetic field strength should be checked before each inspection. This practice is crucial because ensuring that the magnetic field is at the proper strength before conducting any magnetic particle inspection (MPI) helps to achieve reliable and accurate results. The efficiency of the inspection process heavily relies on a consistent and adequate magnetizing field to reveal any surface or near-surface discontinuities present in the material.

Regularly checking the magnetic field strength prior to an inspection guarantees that any fluctuations or issues are identified and corrected beforehand, thus maintaining the integrity of the inspection results. This proactive approach is essential for effective magnetic particle inspections and helps to prevent oversight of potential defects that could compromise the safety and reliability of the examined components.