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简介：TheprocesspropertiesandinterfacebehaviorofCO2laserbrazingwithautomaticwirefeedforgalvanizedsteelsheetswereinvestigated,inwhichthebrazingfillermetalwasCuSi3andnofluxwasused.Astotheappearancequalityofthebrazingseams,therolesoftheprocessingparameters,suchasbrazingspeed,wirefeedingrate,inclinationandfeedingdirectionofthewire,laserpower,spotdiameterandheatingposition,wereassessed.ThefurtherinvestigationindicatesthatthebehavioroftheactiveelementsSi,MnandZnaresignificantlyinfluencedbyenergyinput.Attheinterface,themicrostructureofthebasemetalwascomposedofcolumnarcrystalsandtheacicalarαsolidsolutionwasfoundonthefillermetalside.

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简介：Theeffectivethermalconductivityofcompositeswithellipsoidalfillersisanalyzedbyusingahomogenizationmethodthatisabletorepresentthemicrostructureprecisely.Inthisstudy,variousparameterssuchasthevolumefraction,shape,anddistributionofthefillerarequantitativelyestimatedtounderstandthemechanismsofheattransferinthecomposite.First,thermalboundaryresistancebetweenresinandfillerisimportantforobtainingcompositeswithhigherthermalconductivity.Second,theanisotropyoftheeffectivethermalconductivityarisesfromcontactbetweenfillerinthecaseofellipsoidalfillerandproduceslowerthermalresistance.Finally,thefillernetworkandthermalresistanceareessentialfortheheattransferincompositesbecausethepathofthermalconductionisimprovedbycontactbetweenneighboringfillerparticles.

简介：在这篇论文，韧性剧降裂开(DDC)在不同压力状态下面的在Inconel600同伴Filler金属82的危险性(FM82)被调查。Inconel600是有到一般腐蚀，局部性的腐蚀，和压力腐蚀的优秀抵抗的Ni-Cr-Fe合金，它广泛地尽最大努力被使用了植物。然而，同伴FM82被显示了产生在焊接过程的DDC。解决这个问题，这个工作主要集中于在焊接过程在FM82评估DDC危险性。首先，到破裂(STF)测试的紧张被用来在简单压力状态下面完成DDC标准，并且DDC的形成机制被解释。真实焊接是有复杂压力状态的一个过程。后来，强调状态在建筑群下面得到DDC危险性，关于焊接的多传递的模型借助于有限元素方法被建立。根据数字模拟结果，变丑和温度历史的关系被完成。而且，易受影响的地点和时刻能被决定把结果与STF联系了。模拟结果相当适合从另一研究焊接实验。

简介：Accordingtothespecificationofsuperalloy-stainlesssteelarcbrazingandcharacteristicofthebasemetal,abestfillermetalwhichhasrelativelowermeltingpoint,nicewettability,goodweldforming,andadequateshearstrengthwasresearched.TheexperimentresultsshowthatwettabilityofCuFeMnonthestainlesssteelisverypoor,concomitantwithamassofpurplesootduringtheweldingwhichdeterioratestheworkingcondition.CuSiMnhasthebestwettabilityonboththesuperalloyandstainlesssteel,butthereremainsalotofpitandslagonthesurfaceoftheweldbead.Copper-basedsolderhasthehighestmeltingpointanditswettabilityandclearancefillabilityareweakerthanCuSi3.WettabilityandclearancefillabilityoftheCuSi3arethebestinallthecandidatefillermetals,anditsweldissmoothnessandhashighershearstrength.Foritscomprehensiveability,CuSi3isselectedasthefinalfillermetal.

简介：我们在场为聚合物的有效热传导性(等等)的一个实验模型合成那在填料尺寸分发上包括相关性—选择为Rosin-Rammler分发。等等基于某些假设被决定，到一个模型的连接真实合成材料A的行为合成材料B，充满了单音维的填料。到为等等的马模型的这些假设的申请被介绍。新模型和它的典型方程的确认从参考用试验性的数据被执行。比较由使用尺寸分发法律显示出那一很好在新模型(为ETC的尺寸分发模型)和参考的方程之间合适试验性的结果被获得甚至为大量的部分，大约多达50%。

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简介：Forthedevelopmentofalow-melting-pointfillermetalforbrazingaluminumalloys,aseriesofAl-Si-Cu-(Ni,Sn,Zn)fillermetalshavebeenstudied.Throughdifferentialthermalanalysis(DTA),themeltingtemperaturesofsuchAl-Si-Cu-(Ni,Sn,Zn)fillermetalsweredetermined.Theresultsshowthattheadditionof3wt.%-5wt.%SnintotheAl-6Si-15Cufillermetalcausesitssolidustemperaturetodecreasebyabout12℃.ThefillermetalwiththecompositionAl-6Si-l5Cu-2Niisproposed,whichpossessesameltingtemperaturerangeof512℃to520℃andamicrostructarethatincludesanAl-Cueutecticphases,Al-Si-Cueutecticphases,siliconparticlesandCu_2Al,AlNi_3,Al_7Cu_4NiandAl_3Ni_2intermetalliccompounds.Anadditionof5wt.%-7wt.%ZnintosuchAl-Si-Cufillermetalscausetheirsolidustemperaturestodropfurthertoavaluelowerthan498℃.MetallographicobservationsindicatethattheadditionofZnintotheAl-Si-CufillermetalinhibitstheformationoftheAl-Si,Al-CuandAl-Si-Cueutecticphases.TheremainingphasesareaAl_2Cuintermetalliecompound,anα-Alsolidsolutionandsiliconparticles.

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简介：Ti-basedfillermetalsmadebytransientsolidificationandnormalcrystallizationwereselectedforthevacuumbrazingoftheTiAlalloyand42CrMounderdifferentprocessingparameters.Theresultsshowthatthetensilestrengthofthejointoftransientsolidifiedfillermetalishigherthanthatofnormalcrystallizedfillermetalunderthesameprocessingparameters.Bytheanalysisofscanningelectronmicroscope(SEM)andX-raydiffracting(XRD),itisfoundthatthehigherstrengthmaybecausedbythegeneratingofTiAl,TiNiandTiCuattheinterfaceofjointmadebytransientsolidifiedfillermetal.

简介：Inthispaper,theweldpoolshapecontrolbyintelligentstrategywasstudied.Aneuronself-learningPSDcontrollerforbacksidewidthofweldpoolinpulsedGTAWwithwirefillerwasdesigned.ThePSDcontrolarithmeticwasanalyzed,simulatingexperimentbyMATLABsoftwarewasdone,andthevalidatingexperimentsonvariedheatsinkworkpieceandvariedgapworkpieceweresuccessfullyimplemented.Thestudyresultsshowthattheneuronself-learningPSDcontrolmethodcanattainaperfectcontroleffectunderdifferentsetvaluesandconditions,andissuitablefortheweldingprocesswiththevariedstructureandcoefficientsofcontrolmodel.

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简介：Theobjectiveofthisstudyistoinvestigatetheinfluenceofaddingtinyamountofmixedrareearth(La,Ce)andSrtoAl-20Cu-5Si-2Nifillermetal,byanalyzingthemicrostructure,wettabilityandmechanicalpropertiesofbrazedjoints.Theresultsshowthawiththeadditionofmixedrareearth(La,Ce)intoAl-20Cu-5Si-2Nialloy,theα-AlsolidsolutionaswellasCuAl_2(Ni)intermetalliccompoundphasesignificantlyreduced,whilemoreAl-SieutecticphaseandAl-Si-Cuternaryeutecticphasewereproduced.Andasmixedrareearth(La,Ce)addedin,thewettabilityofAl-20Cu-5Si-2Nifillermetaldecreased,whiletheshearstrengthofthebrazedjointsincreased.TheadditionofMinorSrmodificatedAl-20Cu-5Si-2Nifillermetal,furtherreducedtheCuAl_2(Ni)intermetalliccompoundphase,whichwaspartiallyreplacedAl-Si-Cuternaryeutecticphase.Asaresult,thetensilestrengthaswellasthewettabilityofthefillermetalwasimproved.

简介：LaserweldingwithfillerwireofAZ31magnesiumalloysisinvestigatedusingaCO2laserexperimentalsystem.Theeffectofthreedifferentfillerwiresonthejointpropertiesisresearched.Theresultsshowthattheweldappearancecanbeeffectivelyimprovedwhenusinglaserweldingwithfillerwire.ThemicrohardnessandtensilestrengthofjointsarealmostthesameasthoseofthebasemetalwhenERAZ31orERAZ61wireisadopted.However,whenthefillerwireofER5356aluminumalloyisused,themechanicalpropertiesofjointsbecomeworse.ForERAZ31andERAZ61fillerwires,themicrostructureofweldzoneshowssmalldendritegrains.Incomparison,forER5356fillerwire,theweldshowsastructureofsnowydendritesandmanyintermetalliccompoundsandeutecticphasesdistributeinthedendrites.Theseintermetallicconstituentswithlowmeltingpointincreasethetendencyofhotcrackandresultinfragilejointproperties.Therefore,ERAZ31andERAZ61wirearemoresuitablefillermaterialthanER5356forCO2laserweldingofAZ31magnesiumalloys.

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