Abstract
Since Mg and Fe are virtually insoluble in both solid and liquid states, it is a challenging task to connect AZ31B alloy and 304 stainless steels. In this study, the feasibility of fiber laser butt joining AZ31B alloy to 304 stainless steels with copper foil is investigated. The microstructure and mechanical properties of AZ31B/304SS butt joints during laser welding are studied. The results indicate that the microstructure of the fusion zone consists of equiaxed grains with many white particles. Due to the violent eutectic reaction between the copper foil and AZ31B alloy, a large number of Mg2Cu and Mg-Cu-Al ternary phase form in the fusion zone. The weld seam forms mainly from the melted copper foil and AZ31B alloy. Many eutectic phases are attached on the stainless steels, which displays a good wetting effect. The eutectic phases become scarce at the interface beside AZ31B side and finally vanish in the AZ31B base metals. The maximum tensile strength of butt joints with copper foil can reach 133 MPa. The butt joints are fractured along the interface between the weld seam and stainless steels. Due to the copper foil as a transition bridge, it can be an approach to achieve butt joining AZ31B alloy to 304 stainless steels using copper foil interlayer.
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