(c) If too small?
4. (a) What kind of a “filler-rod” is used in welding steel?
(b) Give a general rule covering relation of “filler-rod” to the metal being welded in all cases, but one or two.
(c) Name one exception.
5. (a) Is a flux (or scaling powder) necessary in welding steel?
(b) Explain why.
6. (a) How is the flame adjusted for steel welding?
(b) What kind of a flame is generally used in finishing steel work?
(c) Why is this done?
7. (a) How is the flame held when executing a steel weld?