Micro-welding　of　Al　and　Cu　foils　is　increasing　used　in　various　industries,　particularly　in　the　production　of　battery　components　for　electric　vehicles.　However,　direct　fusion　welding　of　Al　and　Cu　may　compromise　joint　mechanical　properties　due　to　the　formation　of　brittle　intermetallic　compounds　(IMC).　Consequently,　strategies　for　controlling　IMC　to　enhance　joint　mechanical　properties　have　received　significant　research　attention.　In　this　study,　lap　welds　of　1050　Al　foil　and　T2　Cu　foil　(both　200　μm　thick)　are　achieved　using　a　single-mode　fiber　laser　equipped　with　a　scanning　galvanometer.　This　setup　enables　spatial　power　modulation　for　laser　spot　welding　via　beam　spiral　scanning.　Notably,　laser　fusion　welding　occurs　along　the　laser　beam　scanning　path,　while　laser　weld-brazing　is　achieved　through　heat　conduction　in　the　spiral　spacing　between　the　adjacent　scanning　paths,　resulting　in　a　hybrid　joint　with　alternated　fused　and　brazed　areas.　The　laser　weld-brazing　areas　expand　the　effective　connection　area　of　the　joint,　improving　its　load-bearing　capacity　while　effectively　controlling　IMC　compared　to　fusion　joints.　The　screw-type　hybrid　joints　exhibit　excellent　mechanical　properties,　with　a　maximum　tensile　strength　of　140　MPa.　Experimental　and　simulation　results　indicate　the　mechanism　for　hybrid　joint　formation　and　improvement　in　mechanical　properties.　This　study　provides　an　effective　strategy　for　regulating　joint　microstructure　to　mitigate　the　negative　influence　of　IMC.　©　2024