Preheating before welding is done to____________________?
Correct answer: B. Prevent cold cracks
- A. Make the plate softer
- B. Prevent cold cracks
- C. Avoid plate distortion
- D. Burn oil & grease sticking to plate surfaces
Explanation
Preheating slows the cooling rate of the weld and reduces the formation of hard, brittle structures and hydrogen-induced cold cracks. It is not primarily intended to prevent distortion, which is controlled by welding sequence and restraint.
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