Fusion experiments are complex equipments with often com-
plicated geometry. It is desirable to operate the machines over long
time periods without shut-down interruptions for repair or service.
If there are interruptions of the regular experiment operation, the
search for failures and the repair will be very difficult and extensive
in time and costs. To avoid these kinds of breakdowns, a strong
effort on quality control is necessary like e.g. non-destructive
testing procedures during the manufacturing of components and
its assembly. Beside the visual examination (VT), the method of
penetrant testing (PT) is often most common non-destructive