Magnetic Particle Testing is a magnetic particle inspection method used to detect surface defects. Errors do not have to be open to the inspection surface. Besides being an easy and effective method, being a quick method also plays a big role in applicability.

If a magnetic flux is applied to the inspection surface, leakage flux is formed on the discontinuities on the surface depending on the positioning on the surface. If ferromagnetic dusts are sprinkled on the surface, which is examined with Magnetic Particle, these dusts are drawn by leakage fluxes and collected on discontinuities. Thus, the locations of the discontinuities can be determined by the magnetic particle inspection method.

It will not be wrong to call the productions with ferromagnetic origin together with Yoke, prod and ring accessory devices as detection and reporting of surface and sub-surface discontinuities of forged, cast materials.

Limitations of the magnetic particle test; Not applicable to non-ferromagnetic materials. If the discontinuity is not positioned at an angle to the applied magnetic field direction, it cannot be determined. For large parts, very high magnetizing currents may be required. The surface of the inspection is very rough and adversely affects the result. If there is paint or coating on the inspection surface, its thickness directly affects the inspection result. Often, after the examination, additional operations such as demagnetization and final cleaning are required.

General Standards

EN ISO 9934-1 - Non-destructive testing - Magnetic Particle Inspection - Part 1: General rules
EN ISO 9934-2 - Non-destructive testing - Magnetic Particle Inspection - Part 2: Detection environment
EN ISO 9934-3 - Non-destructive testing - Magnetic Particle Inspection - Part 3: Equipment
EN ISO 3059 - Non-destructive testing - Penetrant inspection and magnetic particle inspection - Inspection conditions
EN 1330-7 - Non-destructive testing - Terms - Part 7: Terms used in magnetic particle inspection
EN ISO 16828 - Non-destructive testing - Ultrasonic inspection - Flight / transition time diffraction technique (TOFD) as a method for determining and measuring discontinuities