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Quality
Control of Dwell
 The
dwell step involves allowing the test component to sit for a sufficient
period of time for the penetrant to fill any surface breaking
defects that happen to be present. There are basically two dwell
modes, immersion-dwell and drain-dwell. The drain-dwell mode has
been shown to produce the most sensitive results. The only real
quality control required in the dwell step of the process is to
ensure that a minimum dwell time is reached. Dwell times are usually
recommended by the penetrant producer or required by the specification
being followed. There is no harm in allowing a penetrant to dwell
longer than the minimum time as long as the penetrant is not allowed
to dry on the part.
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