Discussion
Which flame is suitable for cutting operations?
Answer: C
The flame associated with cutting is the oxidising flame.
Oxy-fuel cutting works by oxidation: the steel is heated to its ignition temperature and then a jet of pure oxygen burns it, the molten oxide being blown out of the cut. The cutting operation is therefore an oxygen-rich, oxidising process, which is the textbook basis for this answer. In practice the small preheating flames are often set close to neutral, but the cut itself is made by an excess of oxygen.
A carburising flame, with excess acetylene, adds carbon and is used for hard-facing and some non-ferrous work, not cutting. The neutral flame is the general welding flame for steel.
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