Welder Red Seal · Question
What is the primary purpose of preheating a base metal before welding?
Preheating slows down the cooling rate of the weld and heat-affected zone (HAZ), reducing the formation of brittle microstructures and allowing more time for di
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Question: What is the primary purpose of preheating a base metal before welding?
Answer options: ✅ To reduce the risk of hydrogen-induced cracking and improve ductility
- To increase the speed of welding
- To improve the aesthetic appearance of the weld bead
- To decrease the required welding current
Correct answer: To reduce the risk of hydrogen-induced cracking and improve ductility
Explanation: Preheating slows down the cooling rate of the weld and heat-affected zone (HAZ), reducing the formation of brittle microstructures and allowing more time for diffusible hydrogen to escape, thereby reducing the risk of hydrogen-induced cracking.
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