Hot cracks occur in the weld and fusion zone’ as the metal solidifies. Which of the following are the causes for hot cracks?
1. Presence of sulphur and phosphorus in the base metal
2. High carbon or alloy content of the base metal
3. Moisture in the joint or electrode
4. Joint restraint
Select the correct answer using the code given below:
(a) 1, 2 and 4 (b) 1, 2 and 3
(c) 3 and 4 (d) 1, 2 3 and 4