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本文通过对双层气体保护焊焊枪结构设计及其工艺试验研究,指出双层保护气体从内外喷咀喷出后维持层流流态是焊枪结构设计的重要依据,并给出了焊枪内外喷咀尺寸参数的设计计算方法,工艺试验研究结果表明,在内层为20％～25％Ar,外层为75％～80％CO_2的气体比例的范围内,配合以恰当的焊接规范参数,可以获得与富Ar混合气体(80％Ar+20％CO_2)保护时相近的各项工艺性能,但Ar气消耗量仅为富Ar混合气体保护时的1/4左右,取得了以少量Ar气保护达到富Ar保护效果。
In this paper, the structure design of the double-layer gas-shielded welding torch and its experimental study are pointed out. It is pointed out that maintaining the laminar flow pattern after the double-layer protective gas is ejected from the inside and outside nozzles is an important basis for designing the torch structure. The design and calculation methods of the dimension parameters and the experimental results show that within the range of the gas ratio of 20% -25% Ar with the outer layer of 75% -80% CO_2, the appropriate welding parameters can be obtained Compared with Ar-rich mixed gas (80% Ar + 20% CO 2), the process performance was close, but the Ar gas consumption was only about 1/4 of the Ar-rich mixed gas protection and achieved with a small amount of Ar gas protection Rich Ar protection effect.