简介：Three-dimensionalfiniteelementmodelwasestablishedtosimulatetemperaturefieldsofT-jointtitaniumsheetsduringTIGweldingwithfiniteelementmethod(FEM)software.Temperaturedependentmaterialpropertiesandtheeffectoflatentheatwereconsidered.Atechniqueofelementbirthanddeathwasusedtosimulatetheprocessofweldedmetalfilling.DynamicvariationprocessoftemperaturefieldsduringTIGweldingwasachieved.Thesimulatedresultsagreedwellwiththemeasuredresults.

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简介：Theeffectofweldingjigontheweldingstressandbucklingdistortionofthinaluminumplatejointswassimulatedbyfiniteelementmethod(FEM).Theresultsshowthattherestraintdistanceandtheheatconductionabilityofthefixturedohaveessentialeffectsontheresidualstressanddistortion.Theresidualcompressivestressanddistortionwillbeincreasingwiththeincreaseoftherestraintdistance,whiletheresidualcompressivestressanddistortionwillbedecreasingwiththeincreaseoftheheatconductionabilityofthefixture.

简介：AnewkindofsimpleandflexibleCO_2weldingsystemwasdevelopedtocarryoutwaveformcontrol.ThesystemconsistedofIGBTinverter,PWMcircuitandmicroprocessorunit(MPU),inwhichtheoutputcurrentofconstantcurrent(CC)powersupplycouldbechangedaccordingtotransientphysicalstate,andthevariabledownsloperatecontrolcouldbeusedtoensureastableweldingprocess.Theweldingexperimentresultsprovedtheeffectivenessofthiscontrolapproach.

简介：Tandemgasmetalarcwelding(T-GMAW)processshowsahighdepositionratethatuptothreetimesofthesingleelectrodeGMAW,sotheweldingspeedcouldbesignificantlyincreasedinthisprocess.However,themajorityofthisprocessapplicationsarebasedonthepre-programmedroboticwelding,whichdoesnotallowthemtotracktheseamreal-timeduringwelding.Rotatingarcsensor,sensingtheseampositionbydetectingthechangingofweldingcurrents,hasbeenwidelyadoptedintheautomaticrobotweldingprocess.Itisproposedinthispapertointegratetherotatingarcsensorwithatrailingtorchtodevelopanewapproachofrotatingarcleadtandemgasmetalarcwelding(RLT-GMAW)process.Thecharacteristicsoftheweldingcurrentsintheproposednewweldingprocesswerefirstlystudied,andthenaself-turningfuzzycontrolseamtrackingstrategywasdevelopedforthemobilerobotautomaticwelding.TheexperimentalresultsshowedthattheproposedRLT-GMAWprocesshadanexcellentseamtrackingperformanceandhighweldingdepositionrate.Evenifthereweresomeelectromagneticinteractionsbetweenthetwoarcs,thedeviationoftheweldingseamcouldalsobereflectedbythefluctuationoftheweldingcurrentsontheleadingarconcethecorrectweldingparameterswereselected.Basedonthedetecteddeviation,theweldingtrackingexperimentsshowedthattheproposedself-turningfuzzycontrollerhadagoodperformancefortheRLT-GMAWprocessseamtracking.

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简介：新奇双旋转的线轴工具磨擦促使焊接(DBT-FSW)被开发，在哪个上面的肩膀(美国)和更低的肩膀(LS)有不同旋转速度。这个过程被试试焊接3.2?公里厚铝锂合金表。metallographic分析和转矩测量被执行描绘焊接formability。试验性的结果与常规线轴工具磨擦相比显示出那促使焊接，DBT-FSW有优秀进程稳定性，和罐头在大量焊接参数生产没有缺点的关节。这些能被归因于在US和LS之间的蹒跚的层结构和失衡的力量的形成在DBT-FSW过程期间引起的材料流动的重要改进。

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简介：数字模拟基于计算液体动力学(CFD)是为在FSW期间调查内在的热机械的条件的份量上的一条有用途径，例如温度地和材料变丑地。在FSW的CFD模拟的关键问题之一是摩擦边界条件的使用，它在数字模型代表在焊接工具和细工品之间的磨擦。在这研究，三维的数字模拟被进行在AA2024的FSW期间分析热转移和塑料变丑行为。为比较目的，边界速度(BV)模型和边界砍压力(BSS)模特儿被雇用以便在在FSW预言温度和材料变丑估计他们的表演。注意不同边界条件在材料变丑上在温度，而是相当不同的预言上产出类似的预言有趣。数字预言与试验性的结果相比。当由BV模型和试验性的大小的预言之间有大差别时，由BSS模型的预言的变丑地区几何学与试验性的结果一致。BSS模型在变丑地区几何学上产出更合理的预言的事实被归因于它的能力自动地在工具/细工品接口调整接触状态。在温度地和材料变丑地上基于有利预言，BSS模型被建议比BV模型在FSW的数字模拟有更好的表演。

简介：Thecharacteristicsoftemperatures,stressesandstrainsfieldshavebeenstudiednumericallyforatitaniumalloysheetweldedwithanimprovedgastungstenarcweldingmethod,inwhichatrailingspotheatsinkisintroducedtocontroltheweldingstressanddistortion.Theimpingingjetmodelisemployedtodescribetheintenseheattransferbetweenthecoolingmediaandthetopsurfaceoftheworkpiece.Theinfluenceofthedistancebetweenarcandheatsinkisinvestigated.Resultsshowthatthereisanidealrangeofdistance.Usingtheidealdistance,alowstressandnodistortionweldingstructurecanbederived.

简介：Thedigitalizationofarcweldingpowersourcemainlydependsonthedigitalizationofarcweldinginverter,sothatmaincircuitandcontrollingsystemcangivefullplaytoadvantages.DigitalswitchingcontrolmakesmaincircuitdigitalandDSPand/orMCUmakescontrollingsystem,digital.SoIGBTdrivingcircuit,asatieofmaincircuitandcontrollingsystem,shouldalsobegotdigitalized.Thus,adigitaldrivingcircuitbasedonoptocouplerdeviceHCPL-316Jisprovided.Sometestingexperimentsweredone.Afterdrivingtesting,thedrivingcircuitcertificatesthatdrivingwaveformssatisfytherequirementsofarcweldingpowersourceandthedrivingcircuitisreasonablyandsimplydesigned.Andthedrivingcircuithashighcontrollingprecisionandreliability.No-load-voltagetestingandweldingexternalcharacteristictestingprovethatthedrivingcircuitcanbeappliedinarcweldingpowersource.

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简介：ThispaperpresentsanintegratedsimulationmodelforfulldigitalcontrolledPMIG/MAGweldingsystemwithMatlab/Simulink,anditconsistsofpowerinverter,digitalcontrolsystemanddynamicarc-loadmodel.AnintegratedsimulationstudywasdoneforfulldigitalPMIG/MAGwelding,andamethodofconnectingdynamicarc-loadmodeltothesystemwithcontrolledcurrentsourcewaspresented,inaddition,thesimulationresultswereutilizedtostudytheissuesofdigitalcontrolPMIG/MAGweldinginthispaper.Theexperimentalresultsvalidatedthedevelopedsimulationmodel,andthissimulationstudycanbeappliedinimplementationofthefulldigitalPMIG/MAGweldingandanalysisofsystemdynamicprocess.

简介：Theeffectsoftwopost-weldheattreatmentprocessesonthemicrostructureandfatiguepropertiesoftheelectronbeamweldedjointsof30CrMnSiNi2Asteelwerestudied.Electronbeamlocalpost-weldheattreatment(EBLPWHT),inavacuumchamber,immediatelyafterweldingandatraditionalfurnacewholepost-weldheattreatment(FWPWHT)wereaccepted.Theexperimentalresultsshowthat,afterEBLPWHT,themainmicrostructureofweldischangedfromcoarseacicularmartensiteintolathmartensite,andbasemetalischangedfromferriteandperliteintoupperbainiteandresidualaustenite,howeverthemicrostructuresofdifferentzonesofjointsinFWPWHTconditionsaretemperedsorbite.Thefatiguecrackgrowthrateda/dNofweldsandbasemetalarenotobviouslychangedamongEBLPWHT,FWPWHTtestandas-welded(AW)test,asthemechanicalpropertiesofmaterialshaveacertainbutnotlargeeffectontheda/dNofweldedjoints.TheresistancetonearthresholdfatiguecrackgrowthdataofweldedjointscanbelargelyimprovedbyEBLPWHTanditisrelatedtomicrostructureandcrackclosureeffect.

简介：AnexperimentalsetupofacquiringthecoaxialvisualimageofthemoltenpoolandkeyholeinhighpowerNd:YAGlaserweldingisintroducedinthispaper.Itisoneofthemostdifficultproblemsinacquiringcoaxialimagethatthecoaxialimagingsignalofmoltenpoolandkeyholemustbeseparatedfromthelaserbeamwithhighpower.Thisproblemwasresolvedbydesigningadichroiticspectroscope.Thecharacteristicsofimagingsignalwereanalyzedandthecoaxialimageofmoltenpoolandkeyholewasacquired.Asmoothingfilterandahomomorphicfilterweredesignedtoremovethelowfrequencynoiseandtoenhancetheimageaccordingtothecharacteristicsofimagingsignal.Atlast,edgesofmoltenpoolandkeyholeweredetectedandextractedbasedonimagesegmentationwiththreshold.

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简介：Cracksmayeasilyoccurinthefusionweldbetweenvanadiumalloysandstainlesssteelduetothebrittleintermetallicsandweldingstress.Thehighvacuumelectronbeambraze-weldinghasbeensuccessfullyusedtojoinvanadiumalloy(V-5Cr-5Ti)tostainlesssteel(HR-2)withelectroplatedCuandAgcoating.Toinvestigatetheeffectsofelectroplatedcoatingontheweldability,thejointappearance,themicrostructureandthemechanicalpropertiesofthejointshavebeenthoroughlyanalyzed.Theresultsshowthatthejointsurfaceconfigurationwasgoodandrootreinforcementwasfullandsmooth.Areactionzone(RZ)wasgainedontheinterfacebetweentheVSCrSTialloyandHR-2stainlesssteelbasemetals.Thewidthofreactionzoneatthetopofthejointwasupto0.65mm,widerthanthatinthebottomofthejoint(0.46mm).Thereactionzoneconsistedofconsiderablysmallerdendriticstructureswithanaveragegrainsizeoflessthan10μm.ElementAgandCualmostenrichedtheinterfacebetweenV-5Cr-5TialloysubstrateandRZ,servingasaphysicalbarrierwhichdecreasesoravoidstheformationofintermetallics.Themaximumtensilestrengthofvanadiumalloy/stainlesssteeldissimilaralloyjointwasmorethan300MPa.Thejointwasdefectsfree.

简介：AnewsimulationmodelofCO2short-circuitingtransferweldingmaybeemployedtodevelopanewpatternofweldingmachineandtopredictweldingprocessparameterstoobtaintheoptimumweldingtechnologyproperties.Inthispaper,anewsimulatingmodelisdevelopedaccordingtotheAWP(adaptingweldingphysicsprocess)waveformcontrolmethod.Goodagreementisshownbetweenthepredictedandexperimentallydeterminedresults.ThemodelwillmakeanimportantpromotioninthedevelopmentofCO2arcweldingtechnique.