During a visual weld examination, which discontinuity could not be detected?

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Multiple Choice

During a visual weld examination, which discontinuity could not be detected?

Explanation:
Visual inspection can only reveal defects that are visible on or very near the surface. It works well for surface irregularities like undercut, surface cracks, or underfill, which alter the appearance or shape of the weld crown or toe. Side wall lack of fusion is an internal issue where the weld metal hasn’t properly fused to the base metal along the side wall, and it can lie beneath the surface. Because of that, it typically cannot be detected by eye during a visual weld examination and requires non-destructive testing methods that probe beneath the surface, such as radiography or ultrasonic testing.

Visual inspection can only reveal defects that are visible on or very near the surface. It works well for surface irregularities like undercut, surface cracks, or underfill, which alter the appearance or shape of the weld crown or toe. Side wall lack of fusion is an internal issue where the weld metal hasn’t properly fused to the base metal along the side wall, and it can lie beneath the surface. Because of that, it typically cannot be detected by eye during a visual weld examination and requires non-destructive testing methods that probe beneath the surface, such as radiography or ultrasonic testing.

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