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    2008,Vo1.29,No.1TRANSACTIONSOFTHECHINAWELDINGINSTITUTION ;MAINTOPICS,ABSTRACTS&KEYW0RDS

    ;P’lrec0璐伽allddIpropertiesm,mly~of

    ;tiImseries0fdectmdedisplaI:eltdIngAl-alloysspotweld-

    ;ingLIUPengfei,SHANPing,LUOZhen,LILianghai2(1.

    ;SchoolofMaterialsScienceandEngineering,TianjinUniversity, ;Tiin300072,China;2.HenanTianfonSteelS~ctureCo., ;LTD,Xinxiang453000,Henan.China).pl4

    ;Abstr’aet:Thechaotictheoryandmethodofphaserecoil—

    ;structionwIereusedtoanalyzesignaltimeseriesofelectrodedis

    ;placementduringspotwelding.Andsomeindexessuchasoptimal ;delaytime,correlationdimension,embeddingdimension,andLya- ;punovexponentwhichcanreflectthechaoticpropertyoftimeseries ;atullnnstwereestimatedquantitativelyfromsignalsofelectrodedis

    ;placement.Asaresult,thechaoticpropertieswerediscoveredin ;thesetimeseries.Andthecomparisonweredoneamongthethree ;methods:energyspeetnunofwavelet,fractaldimensionandLya

    ;punovcomponent.TheresultsshowthattheLyapunovcomponent ;canreflectthechangeofnuggetsizemoreaccurately. ;Keywords:spotwelding;chaotictimeseries;correlation ;dimension;Lyapunovexponent

    ;Effectsoftrllnsverserotatingnlag~cfieldonappearanceof ;weldin~stelrlinert-gasarcweldingHUAAibing,CHEN ;Shujun,YINShuyan,ZHANGXiaoliang(CollegeofMech~d ;EngineeringandAppliedElectronic,BeijingUniversityofTechnolo

    ;gY,Beijing100022,China).p58

    ;Abstr’aet:Ageneratingdeviceoft/’a.nsvel’serotatingmagnetic

    ;fieldwithhigh-frequencymodulationwasdesigned.Carrierwaveand ;modulatingwavewithhighfrequencywereusedtocontroltheexcit- ;ingcurrentandfrequencyrespectively.magneticfieldwas印一

    ;pliedtotungsteninert-gasayeweldinginordertodrivetheaDo- ;tate.Forausteniticstainhsssteel0Cr18Ni12M02i.theinfluenceof ;magneticparametersonappearanceofweldwasstudied.I11echar

    ;acteristicsofainstantshapeinthemagneticfieldareanalyzed. ;Basedonactingzoneofthebasemetal,theinfluencemechanismof ;rotatingmagneticfieldonappearanceofweldisdiscussed.Thetest ;resultsshowthatappearanceofweldiseffectivelyandsimplycon

    ;trolledbytherotatingmagneticfieldifmagneticparametersareprop- ;erlysetted,whichcallsatisfyweldingstandardofdifferentsituations.

    ;Keywords:rotatingmagneticfield;rotatingarc;appear- ;anceofweld

    ;Investigationandapplicationofpulseelectromagneticforcegen- ;eratorfortr~UngcontrolofweldingstressXUDa,XUWei, ;XUWenli,FANGHongyuan(StateKeyLaboratoryofAdvanced ;WeldingProductionTechnology,HarbinInstituteofTechnology, ;Harbin150001.China).p9l2

    ;Abstract:Thet}lin.waUedstructuresofhigh-s~ngthalloy ;haveseriousdistortionandghsusceptibilitytoweldinghotcrack. ;ing.Tosolvetheseproblems,anewtypeofpulseelectromagnetic ;forcegeneratorwasdevelopedtocontrolweldingsnBssinvirtueof

    ;thepulseelectromagneticforceduringwelding,withoutdirectcon. ;tactingtheweldment.Themagnitudeoftheforcecanbecontrolled ;bychangingvoltageofenergystoragecapacitor,whilethefrequency ;oftheforcecanalsobesetin1090Hz.Thegeneratorischarac.

    ;terizedbysimplestructureofmaincircuit,convenientadjustment ;andexcellentrehability.Simulationandexperimentresultsindicate ;thatthegeneratorsatisfiestherequirementofdesign.Thefishbone ;crackingtestwithpulseelectromagneticforceconfirmsthatthepulse ;electromagneticforceiscapableofcontrollingweldinghotcracking. ;Keywords:electromagneticforce;pulse;hotcracking ;Preparationand~~_plexiIl叩甜跗lceanalysisoffunctionallygra?

    ;dientPENforMOLB-typeSOFCbyplasmasprayingdi~Ua

    ;formingYANGYunzhen’,

    ;WANGGuilan1,

    ;ZHANGHaiou2,

    ;XIAWeisheng(1.StateKeyLaboratoryofMaterialProcessingand ;Die&MouldTechnology.HuazhongUniversityofScience&Techn

    ;ology,Wuhan430074,China;2.StateKeyLaboratoryofDigital ;ManufacturingandEquipmentTechnology,HuazhongUniversityof ;Science&Technology,Wuhan430074,China).p1316

    ;Abstract:ThetechnologyintegratedtheFGMdesigntheory, ;theplasmaspray,robotdigitalformingandrapidprototypingwaspr- ;esented.Onthehelpofthefunctionallygradedpowerfeeddevice, ;thePENwaspreparedcontinually,whichwasthecorecomponents ;ofMOLB(mono-blocklayerbuilt)typesolidoxidefuelcell ;(SOFC).Thevariationoftheelements,n1icms?uctureofPENand

    ;porosityofelectrodeswereanalyzedusingE??probeandenergyspec?? ;tramanalysis.Theelectricalconductivityofcompositeelectrodewas ;alsoanalyzedbytheACcompleximpedancetechnology.Theresults ;indicatethatthismethodissuccessfullyusedintopreparingthefunc- ;tionallygradientPENincludingelectrodeswithhighporousandgra

    ;dientlayersthatingredientandorganizationcontinuouslyvary.Asa ;comparison,thematchofcomponentsinthethermalexpansionand

    ;otherperformanceisenhanced,andtheporosityandtheporosity ;distributionafealsoimproved.Moreover.theinterfaceresistances ;betweentheelectrodesandelectrolytesharplydecreasethanthePEN ;withoutthegradientlayers,whichistheadvantageofimprovingthe ;electricalperformanceofS0FC.

    ;Keywords:solidoxidefuelcell;plasmaspraying;function- ;algradedmaterials;positiveelectrolytenegative;compleximped- ;anCe

    ;

    ;?MAINTOPICS.ABSTRACTS&KEYWORDS2008,V01.29,No.1 ;Visualinmge~lllsorforarcweldingwithcontrollableexpo~llre ;basedonCPLIUPengfei,SUNZhenguo,HUANGCao,

    ;CHENQiang,ZHANGWenzeng(KeyLaboratoryforAdvancedMa

    ;terialsProcessingTechnology,MinistryofEducation,TsinghuaUni? ;versity,Beijing100084,China).p1720

    ;Abstract:Tosolvethesynchronizingproblembetweenthe ;fixedexposurescheduleoftheordinaryindustrialCCDcalneraand ;thevariousstateofweldingaredttringweldingprocesses,avisual ;imagesensorwithcontrollableexposurewasdevelopedbasedon ;CPLD(complexprogrammablelogicdevice)forarewelding.The ;novelsensoriscomposedofanordinaryindustrialCCDcalnera,op

    ;ticalsystem,mechanicalirisandanexposurecontroller.Theexpo

    ;surecontrollerconsistsofthemodulesofdetectionofweldingare ;statedetecting,exposureparameterspresetting,logiccontrolwith ;CPLDandsoon.Theexposureschedulelogicsofdifferentafcweld

    ;ingprocessesweredescribedwithvery-highspeedintegratedcircuit

    ;hardwaredescriptionlanguage(VHDL)andprogrammedwitha ;CPLD.BothCO:shortcircuitingtransferarcweldingandpulsedgas ;tungstenarcweldingwerecarriedout,andtheexperimentalresults ;showthatclearandconsistentmoltenpoolimagescanbeacquired, ;andthedisturbancesofarelightandspatterareavoided. ;Keywords:arcwelding;complexprogrammablelogicde

    ;vice;weldpoolimage;visualimagesensor;controllableexposure ;StrippingweManewtechniqueofwetmngenamelledwiresby

    ;nlnceweldYANGShitong,LIYuanbo,LINJianhong(1.

    ;GuangzhouMicroWeldingEquipmentCo.,Gnangzhou510385, ;China;2.SchoolofMechnicalEngineeing,GuangzhouUniversityof ;Technology,Guangzhou510090,China).p2125

    ;Abstract:Anewtechniqueofdirectlyweldingenamelled ;wireswasintroducedandtheweldingtheorywithrelevantexperiment ;resultswasdiscussed.BycombiningSW(strippingwelding)tips ;withcapacitorspotweldingmachine,allequipmenttodirectlyweld ;enamelledwireswasdesigned.Basedonsettingthreeproperwelding ;parameters,SWtipsrealizestrippingandweldingofenamelledwire

    ;inonepulseoutputbyprovidingohmiccontactonthesharpendof ;SWtips.Experimentsshowthemeritsofthenewtechniquesuchas ;thestableweldingprocess,smallerscalenuggetandassuredwelding ;quality.Now,micro-weldingequipmentwaswidelyusedinindustry ;production,andanewtechniqueofweldingtheenamelledwireend ;ofsmallcoilofelectroniccomponentswasprovided.

    ;Keywords:strippingweld;directlyweldingenamelled ;wires;strippingweldingtips;singlesidewelding

    ;Analysisofcorrelationbetweenposition0ffluxstripinits00n? ;striedngarcandpotential0ffluxsZHENGShaoxian,

    ;ZHULiang.ZHANGXulei,CHENJianhong(StateKeyLaboratory ;ofGansuAdvancedNonFerrousMetalMaterials,LanzhouUniversity ;ofTechnology.Lanzhou730050,China).p2630

    ;Abslrad:Positionoffluxstripinitsconstrictingarcisthe ;keytocouswainarcwhichdecidestheheatingcharacteristicsof ;are.Inordertoperfectlyapplyconstrictedafcbyfluxstripstoultra- ;narrowgapwelding,positionoffluxstripinitsconstrictingarehas ;beenanalyzedbycollectingvoltagewaveformoffluxstripwhichisas ;aprobe.Theresultsindicatethepositionoffluxstripinitsconstrict? ;ingarcandthetransfermodeofmeltedfluxstripcanbeestimated ;accordingtothenumericalvalueofvoltagewaveformsoffluxstrip. ;Whenthedistancefromfluxstriptothecenterofareisincreased, ;positionoffluxstripinarezonewillbechanged,atthesametime, ;theeffectofareheatingfluxstripsandthecontactingfrequencyof ;fluxstripanddropletsalereduced.Inaddition,thepositionofflux ;stripwithdifferentpotentialoffluxstripwasmeasured. ;Keywords:constrictingarc;positionoffluxstrip;correla

    ;tionofpotential

    ;Investigationofsprh~obackcontrolandmovementofwelding ;Sealnoftailor-weMedblanksinformingwitlIblankhok]erforce ;J~ANGYinfang~,ZHANGYongkang,ZHUYuanyou2,LI

    ;Luna,WANGJianmin(1.SchcolofMechanicalEngineering, ;JiangsuUniversity,Zhenjiang212013,Jiangsu,China;2.Depart

    ;mentofMechanicalEngineering,NanjingInstituteofTechnology, ;Nanjing210013,China).p3l34

    ;A[~l-act_-Bythemethodsoftheoreticalanalysis,experiments ;andsimulations,themovementofweldingsealnandthespringback ;characteristicoftailor-weldedblanks(TWBs)withlongitudinalweld. ;ingseamwereinvestigatedonthedifferentblankholderforce(BHF) ;forTWBs’springbackcontro1.Inordertocontrolmovementofweld—

    ;ingsean’landeventocontrolTWBs’springback,theformulaabout

    ;thecontrolofmovementofweldingsean’1wasdeducedaccordingto

    ;theprinciplethatequalsectionalstressisdistributedoneachsideof ;TWBs.Fromtheresultsaboutexperimentsandsimulations,when

;BHFissmall,TWBs’springbackisinthemidstofthatofnon—weld

    ;edblanks,whilewiththeincreaseofBHF,TWBs’springbackisthe

    ;biggestamongthem.nleincreaseoftotalBHFbringsdoableef- ;fects,ontheonehand,TWBs’springbackdecreaseswiththein—

    ;creaseofBHF.andontheotherhandthemovementofweldingsearn ;onTWBsincreaseswiththeincreaseoftotalBHF.Inthecondition ;ofimmovabletotalBHF,byadjustingthedistributionofBHF,the ;movementofweldingseamiseliminatedandthespringbackreaches ;totheminimum.Tosumup,onthethoughtofuniformdeformation, ;abigenoughtotalBHFisadopted,andaproperdistributionofBHF ;appliedtoeachsideofTWBsinformingcanreduceweldingseana ;movementandgettheminimumTWBs’springback,whichgivesnew

    ;theoriesandmethodstocontrolTWBs’springback.

    ;Keywords:tailor-weldedblanks;blankholderforce;weld

    ;ingseammovement;springback

    ;Numericalsinmlationonsolderedjoints0fQFI”device,vitlIdif-

    ;ferentsubstratematerialsandthicknessesZHANGHang, ;XUESonghai,LUFangyan,HANZongjie(CollegeofMaterialsSci- ;enceandTeehnology,NanjingUniversityofAeronauticsandAstro

    ;

    ;2008,Vo1.29,No.1TRANSACT0NSOF,I]}IECHINAWEIJD?,4GINSI1TUnON?

    ;nautics,Nanjing210016,China).p3539

    ;Abstract:Visco-plasticfiniteelementmethodwasusedto ;analyzethereliabilityonsolderedjointsofQFPdeviceswiththree ;kindsofdifferentsubstratematerials.nleresultsindicatethatthe ;maximumstressofsolderedjointconcentratesonthesharpcomerof ;interiorpartofthejointwithFR-4substrate,andthemaximumstress ;focusesonthesharpcomerofe~eriorpartofthejointwithLTCC ;substrateandthelargeststressconcentratedaisatthesharpcor?

    ;nerbetweenthesolderedjointandleadwithPrFEsubstrate.Com

    ;panngtheresidualstressofsolderedjointswiththethreesubstrate ;materials,thevalueofresidualstressintheiointwithFR-4substrate ;istheleast,andthevalueismiddleinthesolderediointwithP?1E

    ;substrate,andthevalueisthelargestinthesolderedjointwith ;LTCCsubstrate.3”heanalysisresultsofSn37Pbsolderedjointsarein

    ;accordwiththoseofSn3.8Ag0.7Cusolderedjoint.AtthesalTle ;time,theoptimizingsimulationsonsubstratethicknessesaremade ;andtheresultsshowthatthevalueofresidualstressisthelargestin ;thesolderedjointwhenthethicknessis0.8mln.

    ;Keywords:finiteelementmethod;substratematerials; ;maximulTlstress;substratethickness

    ;Ell’eelsoflllllll(16i~lepowderonconUngdepositedbyaxialplas-

    ;masprayingB2/AI203compositepowdersCHENGHanc

    ;hi’,

;LIZhuoxin’

    ;,

    ;SHIYaowu’,LIQilian2,LIShuqing2(1.College

    ;ofMaterialScienceandEngineering,BeijingUniversityofTechnolo

    ;gY,Beijing100022,China;2.BeijingAeronauticalManufacturing

    44 ;TechnologyResearchInstitute,Bering100024,China).p40

    ;Abstract:TiB2/Al203compositecoatingsweredepositedby ;axialplasmaspraying(MettchAxial?m):oneoffeedstockpowders ;wasconventionalmicrometerpowderderivedfromserf-propagating ;hightemperaturesynthesisprocess,andtheotherwasfabricatedby ;spray-dryingTiB2/03compositepowderdopedwith10%mass ;fractionnanosizeAlE03powder.Microstructureandwearresistance ;oftwotypecoatingswerecompared,andeffectsofnanoscalepowder ;onthecoatingswereinvestigated.Scanningelectronmicroscopeand ;X.raydiffractionanalysiswereusedtoanalyzethesprayedcoatings, ;anddiscablrasivewearapparatuswasemployedtotestwearresis? ;tanceofthecoatings.Resultsshowthatdensityandwearresistance ;ofsprayedcoatingfromspray?ar~ngpowderarebetterthanthatfrom ;conventionalpowder,TiO2contentisalsolessthanthatinthecoat

    ;ingfromconventionalpowder,andsuperficialRockwellnardnesses ;oftwocoatingsareaboutthesal’ne.

    ;Keywords:titaniumdiberide-alumina;nanoscalepowder; ;axialplasmaspray;microstmcture;wearresistance

    ;MechanismofweMpenetrationincreasedbySiO2inACA-TIG ;weldingforahlnlinunlalloyHUANGYong,FANDing(State ;KeyLaboratoryofNewNon-FerrousMetalMaterials,LanzhouUni’

    ;versityofTechnology,Lan~ou730050,China).p4549

    ;Abstract:3”heweldpenetrationincreasedbySiOaisthemost

    ;obviouslywhensomesingle?-componentfluxesareusedassurfaceac.. ;tivatingfluxinACA?TIG(altemafingcurrentactivating-ttmgstenin

    ;ert—gas)weldingofaluminumau0y.3”hemechanismofSiO2increas—

    ;ingweldpenetrationofACA-TIGwddingwasstudied.SiO2haslit. ;tieeffectonweldappearanceofelectronbeamweldingwithpositive ;defocus.AseriesofDCSPA?TIGweldingexperimentswerecarried ;outtoinvestigatetheeffectsofSiO2onweldingarc.Itisfoundthat ;sjO2canconstrictarcpolarityarea.broadenarccolumnandimprove ;arcvoltage.ACA-TIGweldingwithheliumshiehlinggaswascarried ;out.ItisfoundthatSiO2constrictsevaporationa.weakensevap?

    ;orationofactivatingfluxorbasemetal,anddepressesweldpoolSill”

    ;face.Duringtheweldingprocess,SiO2coatingisalwaysontheweld ;poolsurface.OnlythereisverynalTowgaponthecentralregionof ;depressedweldpoo1.Vaporconcentratesinthelowermiddlepartof ;arc.3”heresultsindicatethatarcpolarityareaconstrictionandinput

    ;heatincreasearethemainmechanismtoincreaseweldpenetration

;bySi()2inACA?TIGweldingforaluminumalloy.

    ;Keywords:SiO2;aluminumalloy;altematingcurrentacti

    ;vating-tungsteninert-gaswelding;weldpenetration ;Calculatingmethodofreliabilityonantifatiguefracalreofweld ;LINGuoxiang,YEJinbao,QIUChangiun(SchoolofMechani? ;calEngineering,UniversityofSouthChina,Hengyang421001,Hu

    52 ;nan.China).050

    ;Abstract:Fatiguefractureoftenhappensinweldedjointwith ;gI1strengthinenneeringpractice.3”hereliabilityofweldantifa?

    ;tigueinsafeshonldbeestimated.Accordingtofatiguefracturetheo

    ;ryofmetalmaterialanddriftprincipleinreliabilitytechnology,the ;methodtocalcalatethereliabilityunderthefailureratewithacertain ;cyclenumbersorunderthecyclenumberswithoutfailurewasdis? ;cussedbyusingcrack-lengthbeforeweldfatiguefractureasoutput ;parameter.Apraiticalexamplewasusedtodesignthereliabilityof ;antifatiguefailurestrengthofweldundertheconditionoftheven

    ;cyclenumbersandreliability.

    ;Keywords:weldedjoint;fatiguefracture;reliabihty ;Determinationofweldingresid~stressdistrilmfioninT-s~e ;weldedecj埘蚰JIANGKebin,XIAOYetao,GUOYongtao

    ;(EngineeringInstituteofEngineeringCorps,PLAUniversityofSci? ;enceandTechnology,Nanjing210007,China).05356

    ;Abstract:Inordertoknowthedistributionofweldingresidu. ;alstressesinweldedstructures,thenondestructivetestm?

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