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WHAT IS GAS WELDING GAS welding is a m etal  joining  process  in which the ends of pieces to be joined are heated at their  interface  by producing coalescence with one or more gas flames (such as oxygen and acetylene), with or without the use of a filler metal. It can also be defined as a welding in which combination of gases , usually   oxyacetylene , is used to provide a   hot flame . Gas welding is a process that use fuel gases and oxygen to  weld  and cut metals, respectively. French engineers Edmond Fouché and Charles Picard became the first to develop oxygen- acetylene welding in 1903. Pure oxygen, instead of  air , is used to increase the  flame temperature  to allow localized melting of the workpiece material (e.g. steel) in a room environment. A common propane/air flame burns at about 2,250 K (1,980 °C; 3,590 °F), a propane/oxygen flame burns at about 2,526 K (2,253 °C; 4,087 °F), an  oxyhydrogen  flame burns at 3,073 K (2,800 °C; 5,072 °F), and an acetylene/oxygen flame