How are indications categorized during an MPI inspection?

During an MPI (Magnetic Particle Inspection) inspection, indications are categorized based on their relevance to the potential defects being examined. Classifying indications as relevant or non-relevant allows inspectors to focus on those indications that could signify actual defects needing further investigation. Relevant indications typically suggest the presence of actual discontinuities or flaws in the material that could affect its integrity or performance, while non-relevant indications may include background noise or artifacts that do not represent real issues.

This categorization is crucial for ensuring that the inspection process is efficient and effective, helping inspectors prioritize which indications to address. By identifying the severity and relevance of defects, inspectors can make informed decisions regarding the necessary corrective actions or further testing that may be required.

The other categories mentioned in the options don’t specifically align with the established criteria for interpreting indications in MPI. Recognizing the relevance of indications plays a key role in ensuring quality control in materials used in various critical applications.