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Magnetic Particle Inspection (MPI) can be regarded as a combination of two NDE methods namely magnetic flux leakage and visual testing. Magnetic Flux Leakage is a phenomenon where in the magnetic field is expanded from its normal path due to the presence of the air gap normarlly induced by the presence of the discontinuity (ie crack) on metallic material.

Magnetic Particle Inspection (MPI) can be regarded as a combination of two NDE methods namely magnetic flux leakage and visual testing. Magnetic flux leakage is a phenomenon wherein the magnetic field is expanded from its normal path due to the presence of the air gap normally induced by the presence of the discontinuity (i.e., crack) on metallic material.

North and south poles will be created on the edges of the crack if present during inspection. In such an instance, the magnetic field will spread out when it encounters a small air gap created by the crack owing to its ineptness to support as much magnetic field per unit volume. When the field spreads out, it appears to leak out of the material hence termed a flux leakage field.

During MPI, the component to be examined is initially magnetize, followed by the application of iron particles (dry or wet suspended) on the surface of the component.

In the presence of any defects on or near the surface, the particles will be attracted and cluster at the flux leakage fields, thus forming an indication that can be visually inspected.

We perform the test according to ASTM E 709: Standard Guide for Magnetic Particle Testing.

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