Which factors are specified as considerations for fillet welded patches?

Which factors are specified as considerations for fillet welded patches?

• A. Fabrication Speed and Cost
• B. Visual Appearance and Weight
• C. Weld Joint Efficiency & Crevice Corrosion
• D. Thermal Expansion and Fatigue

Answer: (C)

The key idea is that fillet welded patches must be evaluated for how well the patch welds restore strength and how they affect corrosion in the crevice that forms between the patch and the base metal. Weld Joint Efficiency tells you how much of the original weld strength the patch weld can provide, which is crucial for ensuring the repaired section can carry the intended loads. Crevice corrosion is a common failure mode in patched areas because moisture and corrosive agents can stagnate in the narrow gap under the patch; avoiding or mitigating this is essential for long-term reliability. Together, these two factors—how effective the weld joint is and the potential for crevice corrosion—cover the primary considerations for fillet welded patches. The other options involve operational costs, aesthetics, or general material behavior, which aren’t the specific acceptance criteria for patch integrity in this context.

The key idea is that fillet welded patches must be evaluated for how well the patch welds restore strength and how they affect corrosion in the crevice that forms between the patch and the base metal. Weld Joint Efficiency tells you how much of the original weld strength the patch weld can provide, which is crucial for ensuring the repaired section can carry the intended loads. Crevice corrosion is a common failure mode in patched areas because moisture and corrosive agents can stagnate in the narrow gap under the patch; avoiding or mitigating this is essential for long-term reliability. Together, these two factors—how effective the weld joint is and the potential for crevice corrosion—cover the primary considerations for fillet welded patches. The other options involve operational costs, aesthetics, or general material behavior, which aren’t the specific acceptance criteria for patch integrity in this context.