DETECTING SURFACE INDICATIONS IN FERROMAGNETIC METALS
Magnetic particle inspection (MPI) is a non-destructive test (NDT) method that provides the detection of linear flaws located at or near the surface of ferromagnetic materials. It is viewed primarily as a surface examination method.
The principle of the method is that the specimen is magnetised either direct or indirectly to produce magnetic lines of force in the material. It is a very effective method for the location of surface-breaking and slightly sub-surface defects such as cracking, pores, lack of sidewall fusion in welds etc., in magnetic materials. This quick and relatively easy-to-apply technique is widely used in all industry sectors.
If a crack or other defect is present, the particles will be attracted to the flaw and build up around the leakage for an “indication.” The indication is then evaluated to determine the characteristics and cause of the defect. The results will allow our MPI testing team to understand the type and severity of any discontinuities on the part’s surface or sub-surface.
Advantages of Magnetic Particle Test
Quick and relatively uncomplicated
Immediate indications of defects
Shows surface and near-surface defect
Common Test Methods
BS EN ISO 17638
ASME SEC V, Article 7 & 25
ASTM E709
AWS D1.1
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A magnetic particle test can detect surface and slightly subsurface discontinuities for quick inspections. Our expert testing team will create a magnetic field above the defect and detect the defect through the presence of a flux leakage field.
For more information on our magnetic particle testing, call us or send us an enquiry today.
