VISUAL TESTING (VT)

Description

Visual Inspection NDT techniques rely on the aided and unaided eye for the purpose of inspecting a part. VT is the most common testing method used across all industries. Visual Testing is inherently part of all other test methods. Visual test method may be performed by direct line-of-sight viewing of a specimen or may be used indirectly through the use of mirrors, borescopes, or via remote viewing. Visual inspection may be aided by the use of a magnifying glass or unaided with the naked eye. Many defects can be found using visual testing, including cracks, corrosion, misalignment of parts and discoloration.

As long as inspections are being performed, the Visual Testing Method will be one of the most important tools an inspector can have in his arsenal.

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Advantages

1. Inexpensive
2. Little to no equipment needed
3. Portable
4. Minimum Part Preparation

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Limitation

1. Surface indications only
2. Generally only able to detect large flaws
3. Possible misinterpretation of flaws