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The effect of trace amounts of GaF₃ and Ga₂O₃ nanoparticles on the wettability and spreadability of CsF-AlF₃ flux matched Zn-15Al filler metal were comparatively studied on 6061 aluminum alloy and Q235 low-carbon steel. The experimental results indicate that appropriate amounts of GaF₃ and Ga₂O₃ added into the flux could significantly promote the Zn-15Al filler metal to wet and spread on the surface of 6061 aluminum alloy and Q235 low-carbon steel. The optimum ranges for GaF₃ and Ga₂O₃ were 0.0075–0.01wt.% and 0.009–0.01 wt.%, respectively. Comparative analysis showed that the activity of CsF-AlF₃ flux bearing GaF₃ was higher than that bearing Ga₂O₃. The reason for this is that the former flux has a stronger ability to remove oxides of the base metal and reduce the interfacial tension of the molten filler metal and the base metal.