When checking an item with the magnetic particle inspection method, circular and longitudinal magnetization should be used to

When checking an item with the magnetic particle inspection method, circular and longitudinal magnetization should be used to

• A. Reveal all possible defects
• B. Reduce inspection time
• C. Ensure uniform current flow
• D. Evenly magnetize the entire part

Answer: (A)

In magnetic particle inspection, what you see at a flaw comes from the leakage field created by the defect when the part is magnetized. The shape and orientation of that leakage field depend on how the flaw lies relative to the magnetic direction. If you magnetize in only one direction, some cracks or delaminations oriented unfavorably may not produce a visible leakage and could be missed. By using both circular (around the part) and longitudinal (along the length) magnetization, you create leakage fields for defects in different orientations, making it much more likely to attract the fluorescent or magnetic particles at all defect sites. This combination enhances the chance of revealing all possible defects, including those that would be hidden with a single direction of magnetization.

In magnetic particle inspection, what you see at a flaw comes from the leakage field created by the defect when the part is magnetized. The shape and orientation of that leakage field depend on how the flaw lies relative to the magnetic direction. If you magnetize in only one direction, some cracks or delaminations oriented unfavorably may not produce a visible leakage and could be missed. By using both circular (around the part) and longitudinal (along the length) magnetization, you create leakage fields for defects in different orientations, making it much more likely to attract the fluorescent or magnetic particles at all defect sites. This combination enhances the chance of revealing all possible defects, including those that would be hidden with a single direction of magnetization.