Editing Welding (section)

===Gas welding===
{{main|Oxy-fuel welding and cutting}}
[[File:Oxyfuel gas welding operation-no.svg|thumb|right|alt=diagram|Diagram of oxyfuel welding:
{{image key
|list type=ordered
|Torch tip
|Filler rod
|Flame (outer envelope)
|Fusion
|Base metal
|Weld metal
}}]]

Gas welding, also known as oxyacetylene welding, uses an open flame to generate heat and shield the weld. Compared to arc welding, the flame is less concentrated and lower in temperature, about 3100&nbsp;°C (5600&nbsp;°F) near the torch tip. This causes slower weld cooling, which can lead to greater residual stresses and weld distortion, though it eases the welding of high alloy steels. The diffuse outer envelope of the flame consumes oxygen before it can reach the molten weld pool.<ref name="Weman26" /> When working with easily oxidized metals, such as stainless steel, flux can be brushed onto the base metals.<ref>{{harvnb|Weman|2003|p=30}}</ref>

The equipment is relatively inexpensive and simple, consisting of a torch, hoses, pressure regulators, a tank of [[oxygen]], and a tank of fuel (usually [[acetylene]]).<ref>{{harvnb|Weman|2003|pp=26-29}}</ref> It is one of the oldest and most versatile welding processes, but it has become less popular in industrial applications. It is still widely used for welding pipes and tubes, as well as repair work.<ref name="Weman26" /> A similar process, generally called oxyfuel cutting, is used to cut metals. Oxyfuel equipment can also be used to heat metal before bending or straightening.<ref>{{harvnb|Weman|2003|pp=26-29}}</ref>