2. • VT is the monitoring of specific parameters by
visual and optical assessments of test.
• objects and surfaces using the visible portion of
the electromagnetic spectrum.
• is observation of test object/surface
• with eyes (directly) or optical instrument
(indirectly)
• to evaluate presence of any anomalies and/or
confirmation of test object to specification
3. • an integral part of many of the other
nondestructive testing methods.
• eg., LPT and MPT requires visual observation and assessment of the detected
indication; radiographs require visual inspection for the interpretation of
results; ultrasonic inspection often requires the visual assessment of the trace
on a monitor.
• Luminous energy tests are used for two purposes
a) Testing of exposed or accessible surface of opaque test objects
b) Testing of the interior of transparent objects.
• Visual Testing is used to determine the quantity,
size, surface finish, shape, colour, function,
leakage, and surface discontinuities.
