A　new　type　of　Al-Mg-Er-Zr　alloy　was　welded　by　a　gas　metal　arc　welding　(GMAW)　process.　The　effect　of　GMAW　welding　on　the　microstructure,　microtexture,　and　mechanical　properties　was　investigated　and　compared　with　the　base　material　(BM).　The　results　show　that　GMAW　welding　leads　to　a　change　in　the　grain　shape,　grain　orientations,　phase　composition,　microtexture,　microhardness,　and　tensile　properties.　The　weld　metal　(WM)　exhibits　coarse　grains,　high　proportion　of　high　angle　grain　boundaries　(HAGBs),　and　low　intensities　of　random　textures　compared　with　the　BM.　In　addition,　the　recrystallization　occurs　in　the　HAZ　due　to　the　welding　heat　effect;　grains　and　secondary　phases　are　coarsened　compared　with　the　BM.　The　texture　evolution　in　the　HAZ　exhibits　the　disappearance　of　the　deformation　textures,　along　with　the　transformation　and　competitive　growth　of　P,　R,　and　Cube　recrystallization　textures.　The　average　ultimate　tensile　strength　(UTS)　of　the　GMAW　joints　is　280.7　MPa,　and　the　lowest　hardness　of　75.2　HV　is　located　in　the　WM.　Compared　to　the　BM,　the　welded　joints　in　the　Al-Mg-Er-Zr　alloy　produce　reduced　microhardness　and　tensile　properties.　However,　the　strength　coefficient　of　the　welded　joints　reaches　0.75,　together　with　the　elongation　index　(EI)　of　11.4%,　implying　GMAW　welding　for　the　Al-Mg-Er-Zr　alloys　achieves　a　good　combination　of　strength　and　ductility.