Abstract：AZ31/7005 dissimilar materials were welded successfully by using gas tungsten arc welding (GTAW) with ER4043 and ER4047 welding wire of Al-Si system. Microstructure of the joints was observed and microhardness of the joints was analyzed. The results indicate that joints with good surface and free defects are achieved by GTAW.The fusion zone near magnesium side is the weak zone for mechanical performance of the joints. Contents of Mg and Al keep stable in the fusion zone near magnesium. The fusion zone is mainly composed of Mg17Al12+Mg eutectic microstructure. There is no obvious high hardness brittle phase in the fusion zone near magnesium side. The hardness of joints is slightly higher than that of Mg base metal, but far less than that of Al base metal.
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