Welding　is　one　of　the　most　important　ways　to　connect　metal　materials.　The　mechanical　properties　of　the　welded　joint　are　not　uniform,　which　affects　the　overall　strength　of　the　joint.　Through　the　traditional　experimental　method,　it　is　difficult　to　test　the　mechanical　properties　of　materials　in　different　regions　of　welded　joint.　With　2219　aluminum　alloy　friction　stir　welding(FSW)　joint　as　the　research　object,　two　kinds　of　micro　sample　methods,　nanoindentation　test　and　micro　specimen　tensile　test,　were　respectively　adopted　for　testing.　Through　these　experimental　studies,　the　mechanical　properties　of　materials　were　obtained　in　different　regions　of　welded　joint:　such　as　the　elastic　modulus,　yield　limit,　ultimate　strength　and　so　on.　The　changes　of　the　mechanical　properties　of　the　welded　joint　were　analyzed　from　the　weld　center　to　the　base　metal.　Through　the　data　comparison,　the　results　of　the　two　kinds　of　micro　test　methods　are　basically　consistent　with　each　other.　The　elastic　modulus　in　the　center　of　the　weld　is　relatively　large,　and　decreases　gradually　with　the　transition　to　the　base　material.　The　yield　limit　and　the　ultimate　strength　in　the　center　of　the　weld　are　relatively　small,　and　increase　gradually　with　the　transition　to　the　base　material.　The　elongation　is　relatively　high　in　the　heat　affected　zone　and　relatively　low　in　the　weld　zone　and　the　base　metal　zone.　These　studies　also　provided　the　data　basis　for　the　research　on　the　strength　of　welded　joint.　©　2017　Trans　Tech　Publications,　Switzerland.