Why does an oxyfuel gas welding torch usually have a flame with two distinct regions?
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It preheats the metal and serves as an oxidation shield as for the welding as this layer is where oxygen is consumed in reactions.
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The outer region is the combustion reaction of CO and H2 while the first region is the oxygen and acetylene react to produce carbon monoxide and hydrogen. In the acetylene "feather" or first region closest to the end of the torch.
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