Magnetic Particle Inspection Level 2 Practice Exam

What effect do voids or cracks have on magnetic field lines during inspection?

1. They enhance the magnetic field

2. They have no effect on the magnetic field

3. They disrupt the magnetic field

4. They create a permanent magnet

The correct answer is: They disrupt the magnetic field

Voids or cracks have a significant impact on the behavior of magnetic field lines during inspection. When magnetic field lines encounter these discontinuities, they cannot pass through them smoothly. Instead, these defects create interruptions or disruptions in the flow of the magnetic field. As a result, the lines of magnetic flux are either diverted or concentrated at the edges of the voids or cracks. This local effect around the defect leads to an increase in the magnetic field intensity in those areas, making them more susceptible to attracting magnetic particles used in the inspection process. Consequently, the presence of such defects is detected because the magnetic particles will accumulate at these sites, indicating the presence of voids or cracks. Understanding how defects interact with the magnetic field is crucial for identifying flaws in materials effectively and ensuring the integrity of components being inspected.