Which factor is important to consider when choosing a magnetic particle for inspection?

When choosing a magnetic particle for inspection, the size and saturation of magnetization are crucial factors because they directly influence the effectiveness of the inspection process.

The size of the magnetic particles affects their ability to gather at or near surface defects. Smaller particles can penetrate finer cracks and are better suited for detecting very small discontinuities, while larger particles might be more effective for larger defects. Therefore, selecting the appropriate particle size ensures optimal defect detection based on the material and expected types of flaws.

Saturation of magnetization refers to how well the particles can become magnetized and adhere to cracks or discontinuities. High saturation levels allow the particles to maintain their magnetism and visibility under the inspection process, enhancing the contrast against the background. This results in clearer indications of any flaws present in the material being inspected.

In summary, focusing on the size and saturation of magnetization ensures that the magnetic particles used in the inspection will perform effectively, making it a key consideration for successful revealing of defects in the tested materials.