Laser　metal　deposition　process　was　introduced　to　join　AlSi10Mg　alloys　fabricated　by　powder　bed　fusion-laser　beam/metal　to　improve　the　tensile　strength　of　laser　welded　joints.　The　size　and　the　porosity　of　the　hydrogen　pores　in　the　weld　seam　are　significantly　reduced　by　laser　metal　deposition　welding.　The　ultimate　tensile　strength　of　the　welded　joint　by　using　laser　metal　deposition　reaches　318.8　MPa,　and　the　microhardness　of　the　weld　seam　ranges　from　99.5　to　105.4　HV.　Compared　with　single-pass　welding,　the　ultimate　tensile　strength　and　hardness　are　increased　by　60.6%　and　27.6%.　This　is　mainly　attributed　to　the　reduced　porosity,　refined　α-Al　structures　and　increased　connectivity　of　the　Si-rich　networks　of　the　weld　seam　achieved　by　laser　metal　deposition　welding.　©　2023　Institute　of　Materials,　Minerals　and　Mining.　Published　by　Taylor　&　Francis　on　behalf　of　the　Institute.