Consider the following statements:
The size of the heat affected zone (HAZ) will increase with
1. increased starting temperature
2. increased welding speed
3. increased thermal conductivity of the base metal
4. increase in base metal thickness
Which of the statements given above are correct?
(a) 1,2 and 3
(b) 1 and 3
(c) 1 and 4
(d) 2 and 3