(b) In welding overhead why is it so important that the work be in a molten state before adding the “filler-rod”?
(c) In overhead welding, why doesn’t the metal drop when in a molten state?
LECTURE NUMBER THIRTEEN
Subject—Oxy-acetylene Cutting
1. Explain fully which parts of an oxy-acetylene cutting plant are different from a welding unit.
2. (a) If there is a difference in either of the regulators, mention which one it is.
(b) What is the difference?
(c) Why is it necessary?
3. (a) Is it possible to weld with a cutting torch?
(b) What precaution is necessary if this is done?
(c) Why isn’t this process used?