What kinds of oxyacetylene flame are there in gas welding?

The adjustment of oxygen-acetylene flame gas welding mostly uses oxygen-acetylene flame as heat source. Flames are generally divided into oxidation flame, neutral flame and carbonization flame. What are the characteristics and uses of each flame? Neutral flame, oxidation flame and carbonization flame can be obtained by adjusting the different mixing ratio of oxygen and acetylene. Oxygen and acetylene are fully burned in neutral flame, and there is no excess of oxygen and acetylene, and the internal flame has certain reducibility. The highest temperature is 3050~3 150℃. Mainly used for welding low carbon steel, low alloy steel, high chromium steel, stainless steel, copper, tin bronze, aluminum and their alloys. When welding steel parts, the weld seam is prone to porosity and brittleness. The highest candle flame is divided into three layers, namely, outer flame, inner flame and flame core. The bottom of the innermost flame is red, the second flame is dim, the outermost flame is yellow, and its flame temperature is external flame. It is absolutely correct for me to adopt it. The core of the flame is the lowest temperature alcohol vapor; The internal flame is reducible, also known as "reducing flame", and the temperature is high due to the insufficient combustion of alcohol vapor and the formation of carbonaceous substances. The external flame alcohol vapor burns fully and the temperature is the highest. When conducting experiments, external flame heating is generally used.