Cold　metal　transfer　(CMT)　welding　of　AlSi7Mg　alloy　sheets　prepared　by　selective　laser　melting　(SLM)　was　employed　using　ER4047　and　ER5356　filler　wire.　Effect　of　the　filler　wires　on　hydrogen　pores,　microstructures　and　mechanical　properties　of　welded　joints　was　studied.　As　a　result,　CMT　welding　of　AlSi7Mg　alloy　sheets　using　ER5356　wire　reduces　the　porosity,　refines　the　grains,　increases　the　fraction　of　high　angle　grain　boundaries　(HAGBs),　modifies　the　eutectic　Si-rich　morphology,　and　improves　the　solid　solution　strengthening　of　Si　elements　in　the　alpha-Al　matrix　of　the　microstructures　in　the　weld　metal　(WM).　Additionally,　the　morphology　of　eutectic　Si-rich　phases　in　heat　affected　zone　(HAZ)　of　the　welded　joint　is　noticeably　changed　from　the　continuous　cellular　networks　in　base　metal　(BM)　to　totally　globularized　particles,　as　a　result　of　the　increased　welding　heat　effect　with　decreasing　distance　to　the　WM.　Compared　with　the　ER4047　wire,　the　welded　joint　with　ER5356　wire　achieves　higher　WM　hardness　and　higher　ultimate　tensile　strength　(UTS),　which　have　been　increased　by　13.9　%　and　18.6　%,　respectively.　The　enhanced　mechanical　properties　of　the　welded　joints　with　ER5356　wire　are　mainly　attributed　to　the　reduced　porosity　and　the　improved　microstructures　in　the　WM.