Dissimilar metal joining between 5A02 aluminum alloy and AISI 304 stainless steel was conducted by gas tungsten arc welding with ZnAl15 and AlSi12 flux-cored filler metals,and the effect of the filler metal composition on the microstructures and mechanical properties of the joints were investigated.The results revealed that the tensile strength of as-welded joints made with ZnAl15 and AlSi12 flux-cored filler metals was 121 MPa and 162 MPa respectively.After annealed at 280 ℃ for 30 min,the tensile strength of joints made with ZnAl15 flux-cored filler metal reached 180 MPa,while that with AlSi12 flux-cored filler metal was 166 MPa.The interfacial layer in the weld made with ZnAl15 filler metal was comprised of Znx and [Fe2Al5]Znx,and ternary intermetallic compound Al7.4Fe2Si was found in the interfacial layer in the joint made with AlSi12 flux-cored filler metal.The thickness of the interfacial layers made with both filler metal was less than 10 μm.
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