Optical and visual testing, is a kind of non destructive testing where the test parts are visually checked.The following kinds of defects can be found with this inspection:
- faulty or incomplete assembly, connection
- burr formation untercuts and cracks
- change of colour (tarnishing with for example austenitic steels)
- surface roughness
- lack of fusion
Visual testing is limited to only detect defects on the surface of a test part.