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27320063TRANSACTIONSOFTHECHINAWELDINGINSTITUTIONVol.27No.3March20062219,,,(,150001):2219,2219400500,45060%,,:;;2219:TG403:A:0253-360X(2006)03-09-0402219,,,,[1],,,,[2,3],,,(HAZ),,,,,,[4]Gleeble-1500,2219:2004-12-03:863(2002AA305402)11.122191T87112219(,%)Table1Chemicalcompositionsof2219Al2alloyCuMnTiZrSiFeNi6.380.320.0640.180.0840.180.0321Fig.1Microstructureofbasemetal2219(Al)1(Al),CuAl2,CuAl2,T(CuMn2Al12)[5]1.222191027400mm300mm20mm282K,32Table2WeldingstandardsI0/AI1/Av/(mms-1)U0/VU1/V/mm151133151918.5Ar73Table3Verticaldistancebetweenmeasuringpointsandcenterlineofweldingbeadd/mm162103154205306407608801.3HAZ2,,,,520500450400350,2s350,,3502Fig.2Thermalcyclecurvestested22.1HAZ3,,,(Al),CuAl2CuAl2,500,CuAl2,,520,,(),(Al),CuAl2,,,,450CuAl2,,CuAl2,450CuAl2,CuAl2,Cu,,4Cu2.2HAZ,5,,400500,,450,60%,4mm500,520,500,,,,,,,,3,:221911[6],450CuAl23Fig.3Microstructuresimulatedbydifferentpeaktemperature,500CuAl2(Al),,520,4Fig.4ContentofCuinbasebodybydifferentpeaktemperature5Fig.5Strength2peaktemperaturecurvesindifferentcoolingrate,,,,,,60%,,,,,2.3HAZ1227,(),,,,6,CuAl26Fig.6SEMmicrographsoffracturesurface500,CuAl23(1),2219CuAl2,,,HAZ,4mm450(2),,20/s60%,HAZ(3)2219,:[1],,,.[J].,2004,25(3):11-14.[2],,.}[J].,1990,88(3):108-114.[3]CullisionA.ModernizationprogramfeaturesuniqueGTAweldingoperation[J].WeldingJournal,1990,69(12):53-57.[4],,.[J].,1999,28(4):41-43.[5].[M].:,1975.[6].[M].:,1989.:,,197812,,7Email:mqg66@163.com2006,Vol.27,No.3TRANSACTIONSOFTHECHINAWELDINGINSTITUTIONMAINTOPICS,ABSTRACTS&KEYWORDSCharacteristicparameterdescribingappearanceofaluminumalloyweldinelectronbeamweldingWUQing2sheng,HEJing2shan,FENGJi2cai(NationalKeyLaboratoryofAdvancedWeldingProductionTechnology,HarbinInstituteofTechnology,Harbin150001,China).p1-4Abstract:Basedonvisualimagesensingmethod,variationoftherearpartofthelength(LR)andthewidth(W)ofthefeaturezoneine2lectronbeamweldingofaluminumalloywereinvestigated.Thecharacter2isticparametersdescribingtheappearanceofthealuminumalloyweldinelectronbeamweldingweredeterminedbyanalyzingtherelationshipbe2tweentheappearanceofweldandthefluctuationofRLandW.There2sultsshowthattheappearanceofweldcanbedescribedsuccessfullybythevariationcoefficientofLR(RL)andthevariationcoefficientofW(W)asthecharacteristicparameters,becausethefluctuationofRLandWarethedependentvariableandtheindependentvariableofthevariationoftheweldingpoolrespectively.Theeffectthattheappearanceofweldisdescribedbyboththecharacteristicparametersisthesame.Keywords:electronbeamwelding;appearanceofweld;charac2teristicparameter;imagesensing;aluminumalloyDeterminationofheatedbandwidthcriterionoflocalpostweldheattreatmentforCr2MosteelpipeLUHao,WANGJian2hua,MU2RAKAWAHidekazu(1.MaterialsSchool,ShanghaiJiaotongUniversity,Shanghai200030,China;2.WeldingandJoiningResearchInstituteofOsakaUniversity,Osaka56720047,Japan).p5-8Abstract:Optimumheatingconditionsforlocalpostweldheattreatment(PWHT)ofCr2Mosteelpipewerediscussedfromthepointofviewofresidualstressusingthermal2visco2elastic2plasticfiniteelementmethod(FEM).ThewholehistoryofthestressrelaxationduringlocalPWHTcouldbeclarifiedthroughFEManalysis.TheinvestigationshowedthatthetransientandresidualstressesinducedbylocalPWHTweresig2nificantlyaffectedbycreepbehaviorandtemperaturedependencyofYoungsmodulus.Thestressesdecreasedquicklyintheheatingstage,withdecreasedyieldstrergth.Theycontinuedtodecreaseslowlyaccord2ingtothecreeplawintheholdingstageandincreasedslightlyduetore2coveryofYoungsmoduluswhenthecoolingstagestarted.TheresidualstressafterPWHTdecreasedwithincreaseofheatedbandwidth.Whentheheatedbandwidthwaslargeenough,theresidualstressafterlocalPWHTbecomeclosetothatoftheuniformPWHT.Comparedwiththeex2istingcodes,itwasfoundthattheheatedbandwidthof5Rtoncenteroftheweldseemsreasonablefromtheresidualstresspointofview.AnewphasetransformationmodelwasproposedconsideringthelowtemperatureexpansionduringthecoolingstageofweldingofCr2Mosteelpipe.Experi2mentresultsofweldingresidualstressandthestressafterlocalpostweldheattreatmentarecomparedwithnumericalsimulation.Keywords:localpostweldheattreatment;lowtemperaturephasetransformation;Cr2Mosteel;numericalanalysisMicrostructureandmechanicalpropertiesof2219Al2alloyheat2af2fectedzonewithtwinwireweldingMENGQing2guo,FANGHong2yuan,XUWen2li,JIShu2de(NationalKeyLaboratoryofAdvancedWeldingProductiontechnology,HarbinInstituteofTechnology,Harbin150001,China).p9-12Abstract:Microstructureandmechanicalpropertieschangingrulesof2219Al2alloyHAZ(heat2affectedzone)withtwinwireweldingwerestudiedusingweldingthermalsimulationmethod.Theresultshowsthatthetemperatureintervalofsoftenzoneis400-500for2219Al2al2loytwinwirewelding,and450isthemostserioustemperature.Theminimumstrengthisonly60%ofthebasemetalwithnormalcoolingrate.AndpropertyofHAZisdamagedmoreseriouslywithslowercoolingrate,soincreasingcoolingratecanbeusedtostrengtheningHAZ.Effectofpeaktemperatureonfracturetypeissmall,andthealloyfracturesareallductilerupture.Keywords:thermalsimulation;microstructure;2219Al2alloyNumericalsimulationonvibrationinultrasonicweldingSHENJie