Magnetic Particle Testing
Magnetic Particle Testing also known as MPI
it is a method that can be used to find surface and
near surface flaws in ferromagnetic materials such
as steel and iron it is primarily used for crack detection.
During Magnetic Particle Testing the specimen is
magnetised either locally or overall and if the
material is sound the magnetic flux is predominantly
inside the material. If however during the Magnetic
Particle Testing there is a surface-breaking flaw,
the magnetic field is distorted, causing local magnetic
flux leakage around the flaw. This leakage flux
is displayed by covering the surface with very fine
iron particles applied either dry or suspended in
a liquid. The particles accumulate at the regions
of flux leakage, producing a build-up, which can
be seen visually even when the crack opening is
very narrow. Thus, during Magnetic Particle Testing
a crack is indicated as a line of iron powder particles
on the surface.
At our head office in Ellesmere Port we have a magnetic
bench unit, which enables us to employ all MT techniques
available.
Radiography
Ultrasonic Testing
Dye Penetrant Inspection
High Pressure Testing
Positive Material Identification
Visual Inspection
