<p>Magnesium alloy AZ31B and titanium TA2 were welded by resistance spot welding technology employing an interlayer of brass foil. The microstructure of the joint was observed and analyzed by using SEM and EBSD, with an analysis conducted on the impact of welding current and welding time on the tensile shear load of the joint. An independent nugget was formed on both the AZ31B side and the TA2 side of the joint, with an interstitial layer of unmelted titanium present between the two nuggets. A discontinuous thin Ti₂Cu reaction layer was formed at the welding interface of Mg/Ti. The shear load of the obtained joint initially increased and subsequently decreased as the welding current increased or the welding time extended. When the welding current was set to 23&#xa0;kA and the welding time was maintained at 260&#xa0;ms, the tensile shear load of the joint reached its maximum value of approximately 5.44&#xa0;kN. The results indicate that the welding process of AZ31B magnesium alloy and TA2 titanium using brass foil as an interlayer is fundamentally a welding-brazing process, and that the use of brass enhances the wettability of liquid metal on solid titanium, thereby improving the performance of the joint.</p>