Provide an example of a VT defect indication and its generic acceptance criterion.

• A. A surface scratch that is cosmetic and cosmetic defects are always rejectable.
• B. A broad area discoloration; acceptable if below a threshold.
• C. A visible linear crack along a weld toe; acceptance is defined by the applicable standard or drawing—any crack exceeding specified limits or showing signs of progressive damage is rejectable.
• D. A minor pinhole in coating; always rejectable.

Answer: (C)

In visual testing, defect indications are surface flaws that are judged against a defined acceptance standard. A visible linear crack along a weld toe is a classic VT defect indication because it directly signals a potential structural concern. The generic acceptance criterion for this type of defect is that acceptance or rejection is governed by the applicable standard or drawing; any crack that exceeds the specified size limits or shows signs of progressive damage is rejectable, while cracks within the limits or not progressing may be accepted per the standard. This captures the essential idea: cracks are treated with strict, standard-defined limits, not as absolute rejects or absolutes.

Cosmetic surface scratches, broad area discoloration, and minor coating pinholes are not inherently always rejectable. They can be acceptable if they stay within the threshold defined by the relevant standard or drawing, or may be rejected if they exceed those limits or indicate potential issues. The crack along the weld toe example best illustrates how VT relies on explicit size and progression criteria to determine acceptance.