简介：Plasma-MIG(metalinertgasarcwelding)hybridweldingof6061aluminumalloywith6mmthicknessusingER5356weldingwirewascarriedout.Themicrostructuresandmechanicalpropertiesoftheweldedjointwereinvestigatedbyopticalmicroscopy,X-raydiffraction(XRD),energydispersivespectroscopy(EDS),tensiletest,hardnesstestandscanningelectronmicroscope(SEM)wereusedtojudgethetypeoftensilefracture.Theresultsshowedthatthetensilestrengthofweldedjointwas142MPawhichwas53.6%ofthestrengthofthebasemetal.Theweldingseamzonewascharacterizedbydendriticstructure.Inthefusionzone,thecolumnargrainsexistedatonesideoftheweldingseam.Thefibrousorganizationwasfoundinthebasemetal,andalsointheheataffectedzone(HAZ)wheretherecrystallizationoccurred.TheHAZwastheweakestpositionoftheweldedjointduetothecoarseningofMg_2Siphase.Thetypeoftensilefracturewasductilefracture.