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简介：从短路过渡GMAW模式与其他方法比较中,讨论了RWF-GMAW工艺特点。结果表明,RWF-GMAW工艺能生产低热输入、低的母材稀释和精确焊道位置的几乎无飞溅的焊缝。熔滴过渡是通过表面张力和焊丝机械回抽结合实现的,这使它和常规及先进的短路GMAW工艺区别开来。RWF-GMAW已被入选众多的应用。

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简介：<正>由于气体保护焊(GMAW)具有低成本、高效率、易于自动化等优点,已经成为金属结构制造中最广泛应用的连接工艺。GMAW在应用中也存在一些问题,焊接飞溅就是其中之一。降低焊接飞溅一直是GMAW技术中备受关注的问题。众所周知,射流过渡模式GMAW的焊接飞溅近乎为零,因此被广泛采用。然而在汽车车身机器零部件等的焊接应用中,一个令人疑惑和困扰的问题是:即使采用射流过渡,实际焊接飞溅量仍然比较大。这是因为焊接过程中有频繁的引弧过程,为此,国外的研究者对改善GMAW引弧过程进行了大量研究。加拿大多伦多大学对GMAW引弧采用高速摄像及同

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简介：Roboticgasmetalarcwelding(GMAW)experimentswereconductedusinganERTOS-1electrodewithAr+10%CO_2shieldinggas,andtheweldingcurrentandarcvoltagesignalswerecollectedbyadataacquisitionsystem.TheboundariesbetweenglobulartransferandspraytransferintermsoftheweldingcurrentandarcvoltageweredeterminedaccordingtothewaveformofelectricsignalsandtheFouriertransformresultsofarcvoltage.Theoptimumweldingparametersforthetwotransfermodeswereobtained,whichlaidafoundationforthenumericalsimulationandcontrolofGMAWprocess.

简介：采用熔化极气体保护焊和H08Mn2Si实芯丝材进行三维堆焊成形,采用光学显微镜和扫描电子显微镜观察成形件横截面的组织形貌,并分析其组织机理。结果表明：堆焊成形件的组织呈现出宏观组织整体均匀、微观组织却有循环变化的特点;堆焊成形的循环加热模式决定了成形件的微观组织呈现出循环变化的规律;而已熔敷焊道对后续焊道的预热以及后续焊道对前面焊道的后热,是造成成形件整体组织均匀的主要原因。

简介：Inthispaper,anumericalinvestigationaboutthemetaltransferofGMAWisinvestigatedbasedonthephasefieldmodel.Bedifferentofmostpublishedwork,wetakethethermocapillaryeffectandmixtureenergyintotheprocessofphasetransferandinterfacechangewhichisdifferentfromvolumeoffluid(VOF)method.Wediscretizethewholemodelwithacontinuousfiniteelementmethodandwealsoapplyapenaltyformulationtothecontinuityconditionenhancingthestabilityofthepressure.MetaltransferofGMAWwithconstantandpulsecurrentiscomputedasnumericalexampleswhichagreeswellwiththedataofhigh-speedphotography.Theresultshowsthatthecomputingprocessofthephasefieldmodelisstabilityandithasahigherprecisioninpredictingthediameterofdroplet.

简介：Asadepositiontechnology,gasmetalarcwelding(GMAW)hasshownnewpromiseforrapidprototypingofmetallicparts.DuringtheprocessofmetalformingusingthearcofGMAW,lowheatinputandstabledroplettransitionarecriticaltohighqualityfiguration.TheeffectsofvariousprocessingparametersonfigurationqualitywerestudiedintheexperimentofGMAWrapidprototypingusingthewireofER50-6,includingweldingvoltage,wirefeedingrate,weldingspeedandsoon.TheoptimalparametersforER50-6areobtained.Simultaneously,itisverifiedthattherapidprototypingpartswithfavorablestructuresandqualitycanbeachievedundertheconditionsoflowheatinputandstabledroplettransition.

简介：Weldshapecontrolisafundamentalissueinautomaticwelding.Inthispaper,adoublesidevisualsystemisestablishedforpulsedgasmetalarcwelding(P-GMAW),andbothtopsideandbacksideweldpoolimagescanbecapturedandstoredcontinuouslyinrealtime.Byanalyzingtheweldshaperegulationwiththemoltenmetalvolume,sometopsideweldpoolcharacterizedparameters(WPCPs)areproposedfordeterminingpenetrationinbuttweldingofthinmildsteel.Moreover,someBPnetworkmodelsareestablishedtopredictbacksideweldpoolwidthwithweldingparametersandWPCPsasinputs.

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简介：为在电极融化和金属期间，转移在Gas-Metal-Arc-Welding(GMAW)过程包含了的电、热的特征的模拟的二维的短暂数字分析和计算模块被介绍。非线性的短暂的热转移方程的答案用控制卷被执行有限差别技术。计算模块也包括控制并且工业焊接的规定算法驱动来源。模拟结果是电流和电压波形，在电路的不同部分的吝啬的电压落下，全部的电力，阴极，阳极和弧力量和弧长度。我们与U/I和I/I-modulation模式为正常过程(经常的电压)并且为搏动的进程描述模型的申请。有电流和电压的试验性的波形的比较证明模型与高精确性预言电流，电压和电力。模型为热流动的计算在模拟包裹SimWeld被使用进细工品和焊接缝接形成。从计算的热流动和焊接水池尺寸，相等的容量的热来源能根据Goldak模型，的意见被产生。方法与软件SimWeld在RWTHAachen大学由ISF开发了的模拟被实现并且调查。

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简介：摘要本文对焊缝咬边的产生机理进行了探讨，并对焊接过程中的熔池行为进行了分析，提出了增加焊丝倾角、降低电压和缩短电弧长度等几个方面来控制焊缝咬边产生的工艺措施。

简介：Atypeofnovelinverterpowersupplysystemforhigh-powertwin-wirepulsedgasmetalarcwelding(GMAW)ispresentedmainlyfordealingwiththedisadvantagesoftheconventionalpowersupplyfortwin-wirepulsedGMAWofwhichtheoutputpowerisgenerallydifficulttoincreaseduetolimitationsofthepowerofsemiconductorsandthepowerdensityofmagneticdevices.Inthepowersuppliesforthemasterandslavearcs,thedigitalsignalprocessor(DSP)TMS320F28335isusedtoformtheDSP-basedsynergiccontrolsystemforparallelhigh-powerpulsedGMAW,whichachieveshigh-poweroutputoftwoparallelinverterscontrolledbyasingleDSP;master-slavecommunicationisachievedbyusingecontrollerareanetwork(eCAN)moduleofDSP,thusrealizinganti-phasepulseoutputofhigh-powertwin-wirepulsedGMAWandreducingtheinterferencebetweentwinarcs.Theexperimentresultsdemonstratethatthedesignedinverterpowersupplysystemforhigh-powertwin-wirepulsedGMAWcanbringabouthigh-powerefficiencyofwelding,stableweldingprocessandproperformationofwelds.

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.