How should the inspector grade the severity of indications?

Grading the severity of indications in Magnetic Particle Inspection involves using established criteria that take into account specific factors such as the size, type, and location of the indications. This systematic approach is essential because it allows for consistent and objective evaluations, reducing the variability that might arise from individual interpretations.

Established criteria provide a framework that defines acceptable and unacceptable indications, helping inspectors determine whether a defect poses a potential risk to the integrity and performance of the inspected component. Size can indicate the potential seriousness of a defect, type may relate to the nature of the flaw (like whether it is a crack or a void), and location can influence the implications for structural integrity, especially in critical areas subject to stress.

Using personal judgment, while it may be informed by experience, can introduce bias and lead to inconsistencies in how indications are evaluated. Similarly, evaluating indications based on the time taken for inspection is not relevant to the defect's significance, nor is the color of the indications a standardized measure of severity in this context. Therefore, established criteria are vital for ensuring safety and reliability in materials testing.