科研之友
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摘要
The microstructure and mechanical properties of Mg/Al alloy dissimilar metal resistance lap joints were studied by adding an interlayer of titanium foil. The results show that adding a 0.2 mm thick titanium interlayer can greatly improve the strength of Mg/ Al dissimilar metal resistance spot welding (RSW) joints. The maximum tensile shear force of the joint first increases and then decreases with the increase of welding current; the maximum tensile shear force reaches the maximum of 2.3 kN while the welding current is 14 kA. Al3Ti is formed at the aluminum-titanium interface, and the joint fractures in the heat- affected zone on the magnesium side. After conversion, the shear strength of the joint can reach 156 MPa. SEM and EDS analysis shows that the addition of titanium interlayer blocks the mutual diffusion of magnesium alloy and aluminum alloy, and the titanium interlayer hinders the formation of Mg-Al intermetallic compounds, thereby greatly improving the bonding strength of the joint.
