Which defect is not expected to be found by visual examination of completed welds?

• A. Linear slag inclusion
• B. Undercuts
• C. Overlap
• D. Linear misalignment

Answer: (A)

In the context of visual examination of completed welds, linear slag inclusion is inherently more challenging to identify compared to the other defects listed. While skilled inspectors can often detect undercuts, overlap, and linear misalignment through careful observation, slag inclusions can be difficult to spot because they are typically embedded within the weld metal rather than being visible on the surface. Slag is a byproduct of the welding process and may lie beneath the weld surface, making it elusive to the naked eye during visual examinations.

Undercuts can be readily seen as they create a groove along the weld and can be detected with careful inspection. Overlap appears as a ridge on the surface that can be easily noticed, while linear misalignment results in a visible discrepancy between the parts being welded, also detectable through visual means. Therefore, the correct answer emphasizes that while other defects present clear visual indicators, linear slag inclusion does not reliably conform to this characteristic, making it an exception during visual inspections.