Welder Red Seal · Question
'Weld decay' is a form of intergranular corrosion that can occur when welding unstabilized austenitic stainless steels. What is the metallurgical cause of this issue?
When some stainless steels are heated in the sensitization range (approx. 425-870°C), carbon combines with chromium to form chromium carbides at grain boundarie
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Question: 'Weld decay' is a form of intergranular corrosion that can occur when welding unstabilized austenitic stainless steels. What is the metallurgical cause of this issue?
Answer options:
- Excessive hydrogen being introduced into the weld
- Formation of iron nitrides at the grain boundaries ✅ Sensitization due to chromium carbide precipitation at grain boundaries
- Using a filler metal with a lower alloy content than the base metal
Correct answer: Sensitization due to chromium carbide precipitation at grain boundaries
Explanation: When some stainless steels are heated in the sensitization range (approx. 425-870°C), carbon combines with chromium to form chromium carbides at grain boundaries. This depletes the adjacent areas of chromium, reducing their corrosion resistance and making them susceptible to attack.
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