Magnetic Particle Inspection Level 2 Practice Exam

Cold working indications may not reappear if the part is:

1. Demagnetized then retested

2. Retested after stress relieving

3. Retested in the opposite direction

4. Remagnetized at a higher amperage

The correct answer is: Retested after stress relieving

Cold working indications may not reappear if the part is retested after stress relieving because this process effectively reduces the internal stresses that can cause or enhance the visibility of those indications. Stress relieving typically involves heating the material to a specific temperature, followed by controlled cooling. This thermal treatment helps to redistribute internal stresses and may eliminate the conditions that led to the formation of cold working indications in the first place. As a result, when the part is retested following stress relieving, it is likely that the indications will not be present, or if they are, they may be significantly reduced. This emphasizes the importance of stress relieving as a critical step in processing materials to ensure their integrity and reduce the likelihood of re-detection of these flaws during magnetic particle inspections.