Magnetic Particle Testing

Magnetism is the ability of matter to attract other matter to itself.It is first observed by Greeks. William Hoke discovered the cracks on metals can be detected using different color magnetic particles in 1920. In a magnetic field, magnetic particles are used to determine flux lines. Magnetic particles are also used flux leakage on the outer surface of magnetized solid parts.

• Large surfaces are inspected in a short time.
• Ferro-magnetic properties of materials and resources will be controlled.
• Can be used all kind of  field conditions.
• Controls may be performed daylight and UV.
• Mass manufacturing controls can be performed a very short time.
• Periodical inspections are applied.

Magnetic particle inspection uses the tendency of magnetic lines of force or flux, or of an applied field to pass through the metal rather than through the air. A defect at or near the metal`s surface distorts the distribution of the magnetic flux and some of the flux is forced to pass out through the surface. The fielde strength is increased in the area of the defect and opposite magnetic poles from on either side of the defect. Fine magnetic particles applied to to the part are attracted to these regions and from a pattern around the defect. The pattern of particles provides a visual indication of defects.

Only ferromacnetic materials can be tested by magnetic particle testing.

Advantages

• Best way to detect thin and narrow surface cracks in ferromagnetic materials
• Fast and easy application
• Can be applied thin painted surfaces
• Mobile to apply