Welder Red Seal · Question
A welding procedure specification (WPS) indicates that preheat is required. What is the primary metallurgical reason for preheating a thick section of medium-carbon steel?
Preheating slows the cooling rate of the weldment. This helps prevent the formation of brittle microstructures like martensite and reduces the risk of hydrogen-
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Question: A welding procedure specification (WPS) indicates that preheat is required. What is the primary metallurgical reason for preheating a thick section of medium-carbon steel?
Answer options:
- To increase the welder's comfort
- To remove surface contaminants like oil and rust ✅ To slow the cooling rate of the weld and heat-affected zone
- To increase the tensile strength of the final weld
Correct answer: To slow the cooling rate of the weld and heat-affected zone
Explanation: Preheating slows the cooling rate of the weldment. This helps prevent the formation of brittle microstructures like martensite and reduces the risk of hydrogen-induced cracking in the heat-affected zone (HAZ).
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