2. Dye penetration is a non-destructive
method which is used to detect surface
breaking discontinuities in metals, plastics
and ceramics.
The test is performed by cleaning the test
surface thoroughly and then applying the
penetrate followed by the application of
developer.
3. he flaws can be recognized regardless of
the size, configuration, internal structure
and chemical composition of the surface
area to be tested.
The process is well suited for various types
of surface like cracks, laps, porosity,
shrinkage areas, lamination and similar
discontinuities in castings, forgings and
welds.
4. The developer is drawn
out of the crack by the
reversed capillary action
resulting in a color
indication on the
surface that is broader
than the actual flow and
therefore is much more
visible.
