Magnetic Particle Testing is primarily used to reveal which flaw type?

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Multiple Choice

Magnetic Particle Testing is primarily used to reveal which flaw type?

Explanation:
Magnetic Particle Testing reveals flaws that disturb the magnetic field near the surface. When the part is magnetized, any surface-breaking or near-surface discontinuity creates a leakage field. Applying iron particles then gathers them at these leakage fields, producing visible indications. This makes the test particularly effective for surface cracks in welds, such as cracks at weld toes or along weld beads. Internal voids, subsurface corrosion, and density variations don’t typically produce the surface leakage fields MT relies on, so they're not the primary targets of this technique.

Magnetic Particle Testing reveals flaws that disturb the magnetic field near the surface. When the part is magnetized, any surface-breaking or near-surface discontinuity creates a leakage field. Applying iron particles then gathers them at these leakage fields, producing visible indications. This makes the test particularly effective for surface cracks in welds, such as cracks at weld toes or along weld beads. Internal voids, subsurface corrosion, and density variations don’t typically produce the surface leakage fields MT relies on, so they're not the primary targets of this technique.

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