Topic: Manufacturing
Which of the following carbon steels is most weldable
- A. 1.0% carbon steel
- B. 0.3% carbon steel
- C. 0.5% carbon steel
- D. 0.15% carbon steel
Answer: D. 0.15% carbon steel
Explanation: Low carbon steel (0.15% carbon) is most weldable among them because they can be welded with low preheat and no post-treatment is required.