Introduction
Oxy-acetylene gas welding is a fusion welding based on the use of a welding flame produced by mixing acetylene and oxygen gases. This process is suitable for joining sheets, plates, pipes, repairs, etc. Oxygen and acetylene mixed in suitable proportion produce a flame which has a temperature of 32000c approximately (at its hottest point).
A manual welding process is generally used. Acetylene was generally used as the fuel gas in ox-fuel gas welding, but other gas has also been used. Hydrocarbon fuel gases such as propane, butane, and natural gas are not suitable for welding ferrous metals because the heat output of the primary flame is too low for concentrated transfer or the flame atmosphere is too oxidizing.