2219　aluminum　alloys　welding　joints　were　prepared　by　Friction　stir　welding　(FSW)　and　Variable　polarity　plasma　arc　welding　(VPPAW).　The　microstructure　of　joints　was　characterized　by　means　of　OM,　SEM,　and　EDX.　Microhardness　measurements　was　performed　to　differentiate　the　joint　zones　and　to　evaluate　the　symmetry　level　of　the　joints　with　the　help　of　nano-indentation　experiment.　The　dissymmetry　of　microstructure　and　mechanical　properties　was　found　both　in　FSW　joint　and　VPPAW　joint.　The　dissymmetry　in　FSW　joint　can　not　be　suppressed　due　to　the　nature　of　the　mixing　head,　but　the　symmetry　and　satisfactory　welding　joint　can　be　obtained　by　changing　the　working　pattern　of　VPPAW.