研究了四种单一成分活性剂TiO2、Cr2O3、CdCl2、ZnCl2在不同的涂敷量条件下对镁合金交流TIG焊接熔深的影响，通过对最大熔深时活性剂元素在焊缝中的分布状态分析了熔池的流动情况，在此基础上对不同种类活性剂对镁合金焊接熔深的影响进行了研究。结果表明，在进行镁合金交流TIG焊时，活性剂TiO2、Cr2O3、CdCl2、ZnCl2均可以增加焊缝熔深。从总的趋势看，所选的四种活性剂的涂敷量增加熔深的效果均有一个饱和值。涂敷活性剂后不同程度的改变了熔池中Mg、Al元素的分布情况。涂敷活性剂CdCl2、ZnCl2后在焊缝中没有观察到活性剂元素的存在，而涂敷活性剂TiO2、Cr2O3后在焊缝中观察到了Ti、Cr、O元素的存在，分析认为氯化物活性剂增加熔深的机理主要是活性剂与电弧的相互作用，氧化物活性剂增加熔深的机理主要是活性剂与熔池金属的相互作用。
Five single activating fluxes, TiO2, Cr2O3, CdCl2, ZnCl2, AlF3, were used to investigate the effects of the coating quantity of active fluxes on TIG welding penetration of magnesium alloy. The distribution of active flux element in the weld-pool was measured by EPMA analysis. The results showed that the above activating fluxes all increased the weld penetration. Each flux has a saturation point in penetration increment. The distributions of Mg and Al elements in the weld-pool are changed in different degrees after welding with flux. No active flux element was found in the weld-pool after welding with CdCl2 and ZnCl2 fluxes, however, the elements Ti, Cr and O were observed in the weld-pool after welding with TiO2 and Cr2O3 fluxes, By the analysis, the chlorides increased weld penetration mainly due to the effect of flux on the arc, the oxide increased weld penetration mainly due to the reaction of flux with the fusion zone metal.
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