Magnetic Particle Inspection Level 2 Practice Exam

What is the primary characteristic of a good magnetic particle detection medium?

1. Affinity to the metal surface

2. High visibility under UV light

3. Fine particle size

4. High density

The correct answer is: Affinity to the metal surface

A good magnetic particle detection medium should demonstrate a strong affinity to the metal surface being inspected. This characteristic ensures that the particles adhere effectively to any surface flaws or discontinuities, allowing for accurate detection of potential defects within the material. When the magnetic field is applied, these particles will cluster around the areas of concern, thereby revealing cracks or other inconsistencies that may be critical for the integrity of the component being inspected. While other characteristics like high visibility under UV light, fine particle size, and high density are important for different reasons, they are secondary to the fundamental requirement that the detection medium must bond effectively to the surface of the material to highlight indications efficiently. Without this primary characteristic, the effectiveness of the magnetic particle inspection process would be significantly compromised, as the particles would fail to accumulate at relevant defect sites, potentially leading to missed inspections and undetected flaws in critical components.