Welder Red Seal · Question
In the heat-affected zone (HAZ) of a high-carbon steel weld, which region is typically the most brittle and susceptible to cracking?
The coarse-grained region experiences the highest temperatures short of melting, causing grain growth. This larger grain structure, especially if cooled rapidly
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Question: In the heat-affected zone (HAZ) of a high-carbon steel weld, which region is typically the most brittle and susceptible to cracking?
Answer options:
- The unaffected base metal far from the weld.
- The fine-grained region where recrystallization occurred. ✅ The coarse-grained region immediately adjacent to the fusion line.
- The partially melted zone at the fusion boundary.
Correct answer: The coarse-grained region immediately adjacent to the fusion line.
Explanation: The coarse-grained region experiences the highest temperatures short of melting, causing grain growth. This larger grain structure, especially if cooled rapidly to form martensite, has reduced toughness and is the most susceptible area to hydrogen-induced cracking.
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