Magnetic Particle Inspection Level 2 Practice Exam

Which indication would likely result from a machining fault during the magnetic particle inspection?

1. Surface flaws

2. Shrinkage signs

3. Machining tears

4. Weld cracks

The correct answer is: Machining tears

Machining tears are a direct result of defects that occur during the machining process, such as improper cutting tool conditions, excessive cutting speed, or tool engagement. When these factors lead to tearing at the surface of the material, they create indications that can be easily detected during a magnetic particle inspection. During this inspection method, magnetic particles are applied to the surface of the test material while it is magnetized. Any surface-breaking defects, including machining tears, will disrupt the magnetic field and cause particles to cluster, forming clear indications. In contrast, surface flaws might arise from wear or corrosion rather than machining practices, shrinkage signs relate more to material solidification processes like casting, and weld cracks originate from issues encountered during welding rather than machining. Therefore, among these options, machining tears are the most specific indication associated with faults experienced during machining activities.