CAJ | 학술논문

采用钨极氩弧焊(TIG)方法对AZ31镁合金进行焊接实验，研究新型复合助焊剂对AZ31镁合金焊接接头组织的性能的影响，探索优化镁合金焊接质量的方法和工艺。结果表明：实验所使用的新型助焊剂可通过“电弧收缩”和“表面张力”复合效应来优化焊接热循环；部分助焊剂以原子态进入电弧区域作用于焊接电弧，而熔入熔池的助焊剂则是通过改变熔池表面张力来加大AZ31镁合金焊接熔深，减小熔宽；助焊剂增加熔合区晶粒形核能力，细化该区晶粒，使第二相呈网状分布，提高AZ31镁合金焊接接头的综合力学性能。
채용오겁아호한(TIG)방법대AZ31미합금진행한접실험，연구신형복합조한제대AZ31미합금한접접두조직적성능적영향，탐색우화미합금한접질량적방법화공예。결과표명：실험소사용적신형조한제가통과“전호수축”화“표면장력”복합효응래우화한접열순배；부분조한제이원자태진입전호구역작용우한접전호，이용입용지적조한제칙시통과개변용지표면장력래가대AZ31미합금한접용심，감소용관；조한제증가용합구정립형핵능력，세화해구정립，사제이상정망상분포，제고AZ31미합금한접접두적종합역학성능。
GTAW (TIG) method was applied to the AZ31 magnesium alloy’s welding and the effects of new compound flux on the microstructure and properties of TIG welding of AZ31 magnesium alloy were investigated to develop new method and technology for promoting the quality of magnesium alloy welding. The results show that the new compound flux can optimize the welding thermal cycle through combining the arc-contraction effect and surface tension effect. Part of the flux runs into the arc region and acts on the welding arc. The melting flux into the pool increases the welding penetration of AZ31 magnesium and reduces the melting width by changing the surface tension of the molten pool significantly. The new flux increases fusion zone grain nucleation capacity, refines the grain, and makes the second phase distribute as network, which improves the mechanical properties of welded joints of AZ31 magnesium alloy.