why a mixture of oxygen and acetylene are used in gas welding?
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However, if ethyne (acetylene) is burnt in oxygen, it gives a clean flame with high temperature (3000°C ) due to complete combustion of ethyne. Hence, This oxy-acetylene flame is used for welding and it is not possible to attain such a high temperature with air. Due this reason a mixture of ethyne and air is not used for welding.
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Acetylene being an unsaturated hydrocarbon, burns incompletely in air due to which a sooty flame is produced with very low temperature. On the other hand when a mixture of acetylene and pure oxygen is burnt, then it gives rise to the complete combustion of acetylene to produce a blue flame with a very high temperature which can be used to weld the metals.
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