Gas welding flame temperature

The highest temperature of neutral flame is within the inner flame range of 2 ~ 4 mm from the flame center end, where the temperature can reach 3 100 ~ 3 150℃. In gas welding, this temperature zone is generally used for welding, so it is called welding zone.

The farther away from here, the lower the flame temperature.

The highest temperature of carbonization flame is 2700 ~ 3000℃. Because there is excessive acetylene in the carbonization flame, it can be decomposed into hydrogen and carbon. When welding carbon steel, the free carbon in the flame will penetrate into the molten pool, which will increase the carbon content of the weld, improve the strength of the weld metal and reduce its plasticity.

The highest temperature of oxidation flame can reach about 3 100 ~ 3400℃. Due to the abundant supply of oxygen, the whole flame is being oxidized. If ordinary carbon steel is welded, the oxidation flame will cause the oxidation of molten metal and the burning loss of alloy elements, which will increase the metal oxides and pores in the weld and enhance the boiling phenomenon of the weld pool, thus greatly reducing the welding quality.