Welder Red Seal · Question
In the heat-affected zone (HAZ) of a single-pass carbon steel weld, which region typically experiences the most significant grain coarsening and a subsequent reduction in toughness?
The area of the HAZ immediately next to the weld fusion line is heated to the highest temperatures (just below melting). This high heat and time at temperature
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Question: In the heat-affected zone (HAZ) of a single-pass carbon steel weld, which region typically experiences the most significant grain coarsening and a subsequent reduction in toughness?
Answer options: ✅ The region immediately adjacent to the fusion line
- The intercritical region heated between Ac1 and Ac3
- The fine-grained region
- The unaffected base metal far from the weld
Correct answer: The region immediately adjacent to the fusion line
Explanation: The area of the HAZ immediately next to the weld fusion line is heated to the highest temperatures (just below melting). This high heat and time at temperature causes significant grain growth, forming the Coarse-Grained HAZ (CGHAZ), which can have lower toughness compared to the rest of the weldment.
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