MAGNETIC PARTICLE INSPECTION
Magnaflux® certified fluorescent and visible
magnetic particle inspection materials
offer NDT professionals superior detection
capabilities in the identification of surface
and slightly subsurface discontinuities in
ferrous materials under daylight and black
Magnaflux Magnaglo® fluorescent and Magnavis® visible magnetic particle testing materials are two of the industry’s
most widely used and trusted NDT product lines. Their superior, finely controlled particles deliver maximum sensitivity
to produce vivid indications that are unmatched in their detection of surface and slightly subsurface discontinuities
across a range of ferrous materials. Backed by more than 80 years of magnetic particle experience and an expansive
line-up of accessories and equipment, Magnaglo® and Magnavis® products are designed to support your NDT
inspection process both in the field and in the shop with the level of performance that only Magnaflux® can provide.
Magnetic Particle Inspection (MPI) is a non-destructive testing (NDT) method used to detect surface and near-surface defects in ferromagnetic materials. Ferromagnetic materials are those that can be magnetized, such as iron, steel, nickel, and some alloys.
In the MPI process, the material to be inspected is magnetized, either by applying a direct current or by using an electromagnetic yoke. When a magnetic field is applied, it creates lines of magnetic flux within the material. If there is a surface or near-surface defect, such as a crack, void, or inclusion, the magnetic field lines will distort and "leak" out of the material at the location of the defect.
To visualize these magnetic field distortions and locate the defects, magnetic particles (typically iron or iron oxide-based particles) are applied to the surface of the material. These particles are either suspended in a liquid (wet method) or mixed with a dry powder and applied as a dust (dry method). The particles are attracted to the areas of magnetic flux leakage, forming visible indications that highlight the presence of defects.
The inspector can then examine the surface of the material and look for the patterns of accumulated particles, indicating the presence of defects. The method is particularly effective for detecting defects like cracks, surface porosity, laps, seams, and other discontinuities that are open to the surface.
MPI is widely used in various industries, including manufacturing, aerospace, automotive, oil and gas, and construction, to inspect critical components, welds, and structures for safety and quality assurance purposes. It is a reliable and cost-effective method for detecting flaws in ferromagnetic materials without causing any damage to the tested parts.