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About Visual Testing

Often overlooked in any listing of NDT methods, visual inspection is one of the most common and most powerful means of non-destructive testing. Visual testing requires adequate illumination of the test surface and proper eye-sight of the tester. To be most effective visual inspection does however, merit special attention because it requires training (knowledge of product and process, anticipated service conditions, acceptance criteria, record keeping, for example) and it has its own range of equipment and instrumentation. It is also a fact that all defects found by other NDT methods ultimately must be substantiated by visual inspection. Visual testing can be classified as direct visual testing, remote visual testing and translucent visual testing.

The applications of visual testing include:

(1) Checking of the surface condition of the test specimen.

(2) Checking of alignment of mating surfaces.

(3) Checking of shape of the component.

(4) Checking for evidence of leaking.

(5) Checking for internal side defects.