简介：Automaticgastungstenarc(GTA)weldinghasbeenutilizedtoconnectAZ31magnesiumalloybuttedplateswithAZ61andAZ61-1.0Sbfillerwire.ContrastedtoAZ61fillerwire,theAZ61-1.0Sbfillerwireholdsacomponentof1wt%antimony(Sb).Inthepresentwork,properweldingtechnologyparaneterswereexplored.AndthemicrostructureandperformanceofweldedjointswereanalyzedtoresearchtheinfluenceofSbonmagnesiumalloyweldedjoint.Observedfromthemicrostructureofweldedjoint,additionofSbhasrefinedcrystalgrainsandchangedthepatternofeutecticinbeadandheataffectedzone(HAZ)adjacenttobeadfromdiscontinuousreticulartograininessstructure,whichstrengthentheweaknessofjoint.Inaddition,becauseoftheanchoringactionofMg3Sb2phasesaswellashamperingactiontocrystalboundaryslip,theperformanceofjointweldedbyAZ61-1.0Sbfillerwirehasbeenimproved.

简介：Africtionstirringweldingtojoint5mmrolledAZ31magnesiumhadbeendeveloped.Themicrostructuresinvariousregionsincludingtheweldnugget,thermo-mechanicallyaffectedzone(TMAZ)andheataffectedzone(HAZ)wereinvestigatedandcomparedwithunaffectedparentmetalusingopticalmicroscopy.Theresultsshowedthattheheatandmechanicalprocesshadgreateffectonthemicrostructureevolution.Inweldnugget,theheatwasenoughtoproducesufficientsuperplasticmaterialflowandthemechanicaleffectwasgreatest,andthedynamicrecrystallizationwascompletedthoroughly.InTMAZ,themechanicaleffectwasindirectlyaffectedbytheweldingtoolandonlysomegrainshadundergonedynamicrecrystallization.Thevariousregionswerestudiedindetailtobetterunderstandthemicrostructuralevolutionduringfrictionstirringwelding(FSW).Thecrosssectionnearthe'keyhole'showedclearonionringsbecausethematerialwasstirredonlybytherotationoftheprobeandmaterialsrotatedwiththeprobeanddidnotmovealongweldingdirectionandinverticaldirection,therewasnomaterialflowandtheflowmovementcanberegardedastwodimensionallayerflow.

简介：SolderingofLD31aluminumalloysusingSn-PbsolderpasteafterelectricbrushplatingNiandCucoatingswasnvestigated.ThetechnologyofelectricbrushplatingNiandCuwasstudiedandplatingsolutionwasdeveloped.Themicrostructureofthecoatings,solderedjointandfracturefacewereanalyzedusingopticmicroscopy,SEMandEDX.Theshearstrengthofsolderedjointcouldreachashighas26.83MPa.Theresultsshowedthatreliablesolderedjointcouldbeobtainedat230℃,theadhesionofcoatingsandLD31aluminumalloysubstratewashighenoughtobearthethermalprocessinthesoldering.