Welder Red Seal · Question
A welder is tasked with repairing a structural component made of A36 carbon steel. The shop temperature is 10 °C, and the component thickness is 20 mm. What would be the most appropriate preheating temperature range to minimize the risk of hydrogen-induced cracking?
For A36 carbon steel with a thickness up to 25 mm, a preheat temperature of 50-75 °C is generally recommended, especially at lower ambient temperatures, to redu
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Question: A welder is tasked with repairing a structural component made of A36 carbon steel. The shop temperature is 10 °C, and the component thickness is 20 mm. What would be the most appropriate preheating temperature range to minimize the risk of hydrogen-induced cracking?
Answer options:
- No preheat is required for this material and thickness. ✅ 50 °C to 75 °C
- 100 °C to 150 °C
- 200 °C to 250 °C
Correct answer: 50 °C to 75 °C
Explanation: For A36 carbon steel with a thickness up to 25 mm, a preheat temperature of 50-75 °C is generally recommended, especially at lower ambient temperatures, to reduce the cooling rate and mitigate hydrogen-induced cracking. No preheat would increase the risk, while higher temperatures are typically overkill and can be uneconomical for this specific scenario.
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