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).
The penetrant test (according to ÖN EN ISO 3452-1: penetrant test, general principles) is a non-destructive testing method which uses capillary forces of fine surface cracks and porosities to make these visible. There is a distinction between dye penetrant test and fluorescent penetrant test.
The magnetic particle testing (also magnetic particle crack detection) is a technique to detect cracks in or close to the surface of ferromagnetic materials. The material has to be magnetised for the test. Cracks and surface-near defects which lie crossways to the field lines produce a magnetic leakage field.
The ultrasonic testing is an acoustic method for detecting material defects. This is a non-destructive testing method. Thus it is possible to test components when installed e.g. components of an aircraft.
The radiographic testing method uses an imaging technique of non-destructive testing for the illustration of differences in materials. By means of a proper emitter (X-ray tube or gamma emitting nuclides such as Selen75 or Iridium-192) the density of the tested object is imaged on a radiographic film. A projected image of the tested object appears on the radiographic film.
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