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Quality and Inspection Process Knowledge
Quality and Inspection Services
Penetrant inspection is used on nonporous metal and nonmetal
components to find material discontinuities that are open to the surface and may
not be evident to normal visual inspection. The part must be clean before
performing a penetrant inspection. The basic purpose of penetrant inspection is
to increase the visible contrast between a discontinuity and its background.
This is accomplished by applying a liquid of high penetrating power that enters
the surface opening of a discontinuity. Excess penetrant is removed and a
developer material is then applied that draws the liquid from the suspected
defect to reveal the discontinuity. The visual evidence of the suspected defect
can then be seen either by a color contrast in normal visible white light or by
fluorescence under black ultraviolet light. (See below.)
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