An operator notices excessive soot in the flame during welding. What adjustment should be made?
Increase the oxygen supply to the flame
Excessive soot in a gas-welding flame means the mixture is burning with too much fuel gas and not enough oxygen, giving a rich, carburising flame.
Soot is unburnt carbon from the acetylene that lacks the oxygen needed to burn completely.
The correct fix is to raise the oxygen supply to the flame until the smoky carbon feather disappears and a clean, neutral flame is obtained.
Adding more acetylene would make it richer and sootier, while lowering both gases equally keeps the same rich ratio, so neither solves the problem.
Hence, the answer is Increase the oxygen supply to the flame.
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Important Questions from Welding
To weld metals together, high temperature is required. Such a high temperature is obtained by burning:
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The material used for coating the electrode is called
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