When the ratio of oxygen to acetylene is 1~1.2, the flame generated is calledNeutral flame, also known as normal flame.It consists of flame core,Internal flameandouter flameComposition: near the welding nozzle is the flame core, which is white and bright;The second is the internal flame, which is blue and purple. The temperature here is the highest, about 3150 ℃, 2~4mm away from the front of the flame core. When welding, the workpiece and welding wire should be heated here;The outermost layer is the outer flame, which is orange red.Neutral flame is a commonly used flame in welding, which is used to weld low carbon steel, medium carbon steel, alloy steel, red copper, aluminum alloy and other materials.
Carbonization flame
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When oxygen andacetyleneWhen the volume ratio of is less than 1Carbonization flame。Due to less oxygen and incomplete combustion, the whole flame is longer than the neutral flame, and the temperature is also lower.Excess acetylene in carbonization flame, suitable for welding high carbon steel, cast iron andHard alloy materials。When welding other materials with carbonization flame, the weld metal will be carbonized and become hard and brittle.
Oxidizing flame
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When oxygen andacetyleneWhen the volume ratio of is greater than 1.2Oxidizing flame。As there is more oxygen, the combustion is intense, the flame length is significantly shortened, the flame core is conical, the internal flame almost disappears, and there is a strong faint sound.Because there is much oxygen in the oxidation flame, it is easy to oxidize the metal, so it is not widely used. It is only used for welding brass to prevent the evaporation of zinc.
