An excess of acetylene in an oxy-acetylene flame will give which type of flame?

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Multiple Choice

An excess of acetylene in an oxy-acetylene flame will give which type of flame?

Explanation:
When there is more acetylene than the oxygen can burn, the mixture is fuel-rich. In this carburizing (fuel-rich) condition, not all acetylene can react, so soot particles form and the flame becomes sooty and often yellowish. This creates a reducing environment around the work, which is why it’s called carburizing. It’s the opposite of an oxidizing flame (excess oxygen, blue and cleaner) and different from a neutral flame (balanced fuel and oxygen). An invisible flame isn’t typical for oxy-acetylene in practical use.

When there is more acetylene than the oxygen can burn, the mixture is fuel-rich. In this carburizing (fuel-rich) condition, not all acetylene can react, so soot particles form and the flame becomes sooty and often yellowish. This creates a reducing environment around the work, which is why it’s called carburizing. It’s the opposite of an oxidizing flame (excess oxygen, blue and cleaner) and different from a neutral flame (balanced fuel and oxygen). An invisible flame isn’t typical for oxy-acetylene in practical use.

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