- Magnetic Particle Inspection
- Dye Penetrate Inspection
- Eddy Current Inspection
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This inspection is preformed on clean steel parts.
The part is placed within a magnetic coil and
magnetized. It is then coated with a magnetic
florescent liquid. In a darkened area a black light
is used to insect the part. If the part has a crack
or defect, the area will become polarized from the
magnetization. The magnetic florescent liquid will
be attracted to the area and will fluoresce or glow
bright green in the black light. After inspection,
the part is demagnetized.
This inspection is preformed on clean aluminum
parts. The part is coated with a special florescent
penetrant and is set aside to allow the penetrant to
absorb into any cracks or defects. The part is then
rinsed and dried. A chalky powder is sprayed onto
the part to draw out the penetrant from any cracks
or defects. In a darkened area a black light is used
to inspect the part. If the part has a crack or
defect, the drawn out penetrant will fluoresce or
glow bright green in the black light.
At our facility, this inspection is preformed on
clean aluminum parts. This method uses electric
current to detect changes in the properties of
conductive materials. These changes are represented
as a graph on the Eddy Current machine.
A probe, containing a very small tightly wound coil
is placed in contact with the part to be inspected.
Alternating current is applied to the coil which
causes a magnetic field to be created around the
coil. Similar to the principals of a transformer,
the area of the part closest to the probe, in turn,
produces its own magnetic field which counteracts
the probes magnetic field. The opposition between
these two magnetic fields can be monitored for any
change. Since the current applied to the probe
remains constant, any change is attributed to the
part being inspected.
This allows the Eddy Current method to detect
changes in alloy, geometry, hardness, as well as
detecting flaws in the material such as corrosion,
fatigue cracks, laps, seams, and porosity.