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It is the examination of conditions affecting the quality such as discontinuities, structural defects, surface condition on the surface of a product or metal parts, with or without the use of an optical aid (such as a magnifying glass).
Visual inspection can be seen as a very simple method, but it is one of the most important inspection methods. It is mostly a work that needs to be done before the application of another non-destructive testing method. In fact, most of the application standards prepared for other non-destructive testing methods require first visual inspection and recording the findings.
This method can be applied to all metallic or non-metallic materials. Depending on the accessibility to the examination surfaces, it can be applied by using auxiliary devices such as endoscopes when necessary. Surface cleaning is generally not desirable as a preparation for the inspection surface. More precisely, the surface should be such that the expected defects are best visible. The examination is carried out under sufficient light conditions and according to appropriate viewing angles.
