Gas welding is a metal joining process in which fuel gasses (gasoline) and oxygen are used to weld and cut metals.
 
Gas welding is the process of using heat generated from burning a fuel gas (like acetylene) to cut and/or join metals together. Gas welding is one of the most impotypes of welding because of its scope of application.
 
It is one of the oldest forms of heat-based welding and remains the go-to option for many industries.