Oxy-fuel welding

Oxy-fuel welding (commonly called oxyacetylene welding, oxy welding, or gas welding in the United States) and oxy-fuel cutting are processes that use fuel gases (or liquid fuels such as gasoline) and oxygen to weld or cut metals. 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.

common propane/air  flame burns at about 2,250 K (1,980 ° C; 3,590 ° F)
propane/oxygen            flame burns at about 2,526 K (2,253 ° C; 4,087 ° F)
oxyhydrogen                    flame burns at about 3,073 K (2,800 ° C; 5,072 ° F)
acetylene/oxygen            flame burns at about 3,773 K (3,500 ° C; 6,332 ° F)

In oxy-fuel welding, a welding torch is used to weld metals. Welding metal results when two pieces are heated to a temperature that produces a shared pool of molten metal. The molten pool is generally supplied with additional metal called filler. Filler material selection depends upon the metals to be welded.

In oxy-fuel cutting, a torch is used to heat metal to its kindling temperature. A stream of oxygen is then trained on the metal, burning it into a metal oxide that flows out of the kerf as dross.

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