(b) What would happen if the other torch-valve were opened first?
(c) What would likely occur if both valves were opened before torch was lighted?
6. (a) How is it possible, when lighting torch, to determine whether enough pressure is on the acetylene line without looking at gauge?
(b) How is it possible, in the case of oxygen pressure?
7. (a) What is meant by a neutral flame?
(b) How hot is a neutral oxy-acetylene flame?
(c) Is the temperature of a neutral flame the same whether large or small tip is used?
8. (a) If too much acetylene gas is used, how will the flame be affected?
(b) What action will this have on the weld?
9. (a) If too much oxygen gas is used, how will the flame be affected?