An operator notices excessive soot in the flame during welding. What adjustment should be made?
Increase the oxygen supply to the flame
In oxy-acetylene gas welding the flame character depends on the ratio of oxygen to acetylene fed to the torch.
Excessive soot means the flame is burning with too much fuel gas and too little oxygen, producing a rich, carburising flame.
The soot is unburnt carbon released from the acetylene because there is not enough oxygen to burn it completely.
The correct fix is to increase the oxygen supply to the flame until the smoky carbon feather disappears and a clean, sharp neutral flame is obtained.
Reducing the oxygen supply would make the mixture even richer and sootier, worsening the problem.
Adding more acetylene likewise increases the fuel excess and soot, while lowering both gases at the same rate keeps the same faulty ratio, so none of these clears the soot.
Hence, the answer is Increase the oxygen supply to the flame.
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Important Questions from Welding
The flame which contains excess oxygen than theoretical required:
In gas welding, the inclination of the blow pipe with respect to the plate in Leftward welding is-
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In the flash butt welding:
Carburising flame is used to weld metals like _____.
