State the working principle of gas welding.

State the working principle of gas welding.
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Working principle of gas welding: Gas Welding is a fusion welding process. It joins metals, using the heat of combustion of the oxygen/air and combustible gas (i.e. acetylene, hydrogen, propane, or butane) mixture. The purpose of flame is to heat and melt the parent metal and filler rod of the joint. The intense heat produced melts the edges of parts and fuses together to form the welded, generally with the addition of a filler metal. The torch mixes a combustible gas with oxygen in the proper ratio and flow rate providing combustion process at a required temperature. The flame temperature is determined by a type of the combustible gas and proportion of oxygen in the combustion mixture: 4500°F - 6300°F (2500°C - 3500°C). Depending on the proportion of the fuel gas and oxygen in the combustion mixture, the flame may be chemically neutral (content of the gases), oxidizing (excess of oxygen), and carburizing (excess of fuel gas). Welding does not require the components to be forced together under pressure until the weld is forms and solidifies. 

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