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Oxy-fuel
welding is a welding process commonly called oxy-acetylene welding, since
acetylene is the predominant choice for a fuel, or often simply gas welding. A
virtually identical procedure, with a different type of gas torch, is used for
cutting metal and called oxy-fuel cutting. In gas welding and cutting, the heat
energy and high temperature needed to melt the metal is obtained by the
combustion of a fuel gas with oxygen in a torch. This sort of torch is often
called a blowtorch.