Is an optical inspection of a product or part for defects and blemishes as a conventional step in the production process at the end or after completion of the manufacturing of a product for quality control reasons.
Sight checks are also performed on operating parts. Visual inspection as a non-destructive testing method is standardised according to DIN standard DIN EN 13018 (General principles of visual inspection).
This standard is distinguishing between:
The distinction between direct and indirect visual inspections is defined in the standard as follows:
Are mechanical damage (scratches, cracks), dirt settlings, assembly errors, feathering, end-crater-cracks and undercuts.
Alongside colour changes (annealing colours at e.g. austenitic steels), surface roughness etc. can be discovered effectively.
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