Magnetic Particle Inspection Level 2 Practice Exam

Which of the following can cause non-relevant indications in magnetic particle inspection?

1. Joints between dissimilar metals

2. Brazed joints

3. Roughing tool cuts on surface

4. All of the above

The correct answer is: All of the above

Non-relevant indications in magnetic particle inspection are those that do not represent actual flaws in the material being inspected but may arise from various features or surface conditions. Each of the options presented can indeed lead to such non-relevant indications. When it comes to joints between dissimilar metals, these areas can create variations in magnetic permeability and field patterns that could result in indications that don't reflect defects. This is particularly true if the magnetic field is distorted or if there are inherent differences in the magnetic properties of the metals involved. Brazed joints are similar in that the braze material can exhibit different magnetic characteristics compared to the base metals. This disparity can disrupt the magnetic field and produce indications that might be misinterpreted as relevant flaws. Roughing tool cuts on the surface can also contribute to non-relevant indications. The texture left by machining processes can cause excess magnetic particle retention, potentially leading to indications that suggest defects when they are simply a result of the surface roughness. Since all the mentioned factors can induce non-relevant indications, the correct answer encompasses the entirety of conditions, as they all can mislead the inspector regarding the presence of actual defects in the material. Understanding these potential sources of non-relevant indications is crucial in magnetic particle inspection to ensure