When ethyne is burnt in air incomplete burning takes place and produce sooty flame due to limited supply oxygen present in the air. 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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Explanation:
When ethyne is burnt in air incomplete burning takes place and produce sooty flame due to limited supply oxygen present in the air. 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.