Which action is specified for repairing cracks in welds?

Which action is specified for repairing cracks in welds?

• A. Grind and weld over the crack
• B. Remove and reweld bad sections
• C. Fill with epoxy only
• D. Ignore the crack and proceed

Answer: (B)

When repairing cracks in welds, the repair must remove the defect and recreate a sound joint. That means cutting out the cracked weld section (and a small surrounding area of heat-affected material) so all compromised metal is eliminated, then cleaning and re-welding with proper technique on clean, sound base metal. This approach directly addresses the flaw, removes the source of weakness, and allows the new weld to fuse correctly with the base metal. Grinding over the crack hides it rather than fixing it and can leave a hidden flaw that may crack again under load. Filling with epoxy isn’t suitable for structural weld repairs because it won’t provide the necessary strength or heat resistance. Ignoring the crack is dangerous and can lead to sudden failure. After removing the bad portion and welding, proper inspection and, if required, preheating or post-weld treatment should be done to ensure the repair holds under service conditions.

When repairing cracks in welds, the repair must remove the defect and recreate a sound joint. That means cutting out the cracked weld section (and a small surrounding area of heat-affected material) so all compromised metal is eliminated, then cleaning and re-welding with proper technique on clean, sound base metal. This approach directly addresses the flaw, removes the source of weakness, and allows the new weld to fuse correctly with the base metal.

Grinding over the crack hides it rather than fixing it and can leave a hidden flaw that may crack again under load. Filling with epoxy isn’t suitable for structural weld repairs because it won’t provide the necessary strength or heat resistance. Ignoring the crack is dangerous and can lead to sudden failure. After removing the bad portion and welding, proper inspection and, if required, preheating or post-weld treatment should be done to ensure the repair holds under service conditions.