4. Explain how cutting can be done with the welding torch if necessary.
5. (a) In cutting by the oxy-acetylene process, which does the cutting, the oxygen jet or the neutral flame?
(b) What action has the oxygen jet on the metal?
(c) What part does the neutral flame play in cutting?
6. Can oxygen or acetylene under sufficient pressure be made to cut individually? Explain fully.
7. Why is it specially important that armored hose be used on the oxygen line when making heavy cuts?
(Give at least two reasons.)
8. (a) How is a cutting torch lighted? Describe in detail.
(b) How is cut started on metal?
(c) How is torch held in regard to metal being cut?