DC A-TIG welding on 3003 Aluminum alloy was investigated.The single component and multi-component of halide NaCl,CaF2and oxide SiO2,MnO2,TiOv were served as activating fluxes to study the effect on weld penetration,weld forming and joint microstructure.The result shows that DC A-TIG with certain activating fluxes can improve weld penetration,quality and productivity.Overall,the activating fluxes could increase weld penetration more than twice,except for NaCl.Multi-component of halides and oxides has more si...