光焊接过程视觉传感技术的发展现状

:2007-11-01(,150080):CCDCMOS,,,,,,,:;;:TG115.28:A:0253-360X(2008)02-0108-050,,,,,,,,,,1,CCD(charged-coupleddevices)CMOS(complementaryoxidesemiconductors)CCD,,;CMOS,,,,1CCDCMOS1CCDCMOSTable1ComparisonofperformancesbetweenCCDandCMOSCCDCMOS,(/s),60dB,120dB,CMOS,,,,,,,CCD,,,,29220082TRANSACTIONSOFTHECHINAWELDINGINSTITUTIONVol.29No.2February2008CMOS,21990,VoelkelMazumder[1]1997(FraunhoferInstituteofLaserTechnique)(UniversityofWaterloo),CCD[2],;,,2.1Matsunawa[3],,,Ar+,X,,,1,Ar+,,,X,;XXKamimuki[4],Ar+,,21Fig.1Activesidevisualsensingsystem2Fig.2Sketchofsidevisualmonitoringwithcoaxialillumina2tion,,,;,,2.2,2:109,,Nd:YAG,,,,3a,b;CO2,,3c3Fig.3SketchmapofcoaxialimagingsignalacquisredfromCO2andNd:YAGlaserbeamlightpathKratzsch[5,6]3a,b,CCD,,,,Beersiek[2,7-9]CO2Nd:YAG,CMOS,4,Beersiek,,,,,Beersiek,Boeske[10]4Fig.4Coaxialimageacquisitionsystemoflaserweldingpro2cess,FraunhoferCMOSCPC(coaxialprocesscontrol),Prome2tecCMOSPD2000,5110295Fig.5CoaxialvisualsensordevelopedbyGermanycompanyFraunhoferPrometecKamimuki[11]514.5nmAr+,Ar+,,6KamimukiAr+,,Ar+,,Ar+Kamimuki,6Fig.6Activecoaxialvisualsensingsystem,,,,[12],Nd:YAG,Nd:YAG,7[13]CMOSCO27Nd:YAGFig.7CoaxialvisualsensingsystemofNd:YAGlaserweld2ingprocess3,,,,,:[1]VoelkelD,MazumderJ.Visualizationofalasermeltpool[J].Ap2pliedOptics,1990,29(12):1718-1720.[2]BeersiekJ.On2linemonitoringofkeyholeinstabilitiesduringbeam2:111welding[C]//InternationalConferenceonAppliedLaserandElectro2Optics:Proceedingsofthelasermaterialsprocessingconference.Or2lando:LaserInstituteofAmerica,1999:49-58.[3]MatsunawaA,SetoN,KinJD.DynamicsofkeyholeandmoltenpoolinhighpowerCO2laserwelding[C]//SPIE-TheInternationalSocietyforOpticalEngineering.Osaka,Japan,1999,3888:1-12.[4]KamimukiK,InoueT,YasudaK,etal.Preventionofweldingde2fectbysidegasflowanditsmonitoringmethodincontinuouswaveNd:YAGlaserwelding[J].JournalofLaserApplication,2002,14(3):136-145.[5]KratzschC,AbelsP,KaierleS.Coaxialprocesscontrolduringlaserbeamweldingoftailoredblanks[C]//InternationalForumonAd2vancedHighPowerLaserandItsApplication.Osaka,Japan1999,3888:472-782.[6]AbelsP,KaierleS,KratzschC.Universalcoaxialprocesscontrolsystemforlasermaterialprocessing[C]//InternationalConferenceonAppliedLaserandElectro2Optics:Proceedingsofthelasermaterialsprocessingconference.Orlando:LaserInstituteofAmerica,1999:99-108.[7]BeersiekJ.In2processmonitoringoflaserbeamwelding[J].Industri2alLaserSolutions,2003(4):15-16.[8]BeersiekJ.ACMOScameraasatoolforprocessanalysisnotonlyforLaserBeamWelding[C]//InternationalConferenceonAppliedLaserandElectro2Optics:ProceedingsoftheLaserMaterialsProcessingConference.Florida,USA,2001:206-215.[9]BeersiekJ.NewaspectsofmonitoringwithACMOScameraforlasermaterialsprocessing[C]//InternationalConferenceonAppliedLaserandElectro2Optics:ProceedingsoftheLaserMaterialsProcessingConference.Arizona,USA,2002:11-21.[10]BoeskeL,KreutzEW,PeterritJ.Failurerecognitionandonlineprocessingcontrolinlaserbeamwelding[C]//InternationalConfer2enceonLaseerTechnologiesinWeldingandMaterialsProcessing.Katsiveli,Crimea,Ukraine,2003:217-221.[11]KamimukiK,InoueT,YasudaK.DevelopmentofmonitoringmethodforYAGlaserweldinganditsapplication:studymonitoringtechnologyforYAGlaserwelding[J].WeldingInternational,2002,16(3):212-218.[12].Nd:YAG[D].:,2004.[13].[D].:,2003.:,,1965,,1,10Email:[e-mail]112292005,thepredictionaccuracyofthemodeltrainedusing19samplesof29samplesreached100%usingtheother10samples.Keywords:alternaterailflashbuttwelding;radialbasicfunctionneuralnetwork;grey2spotarea;predictionFrictionstirweldingofAZ91DmagnesiumalloysheetLUOHua,HAOChuanyong(InstituteofMetalResearch,ChineseA2cademyofSciences,Shenyang110000,China).p97-100Abstract:Frictionstirwelding(FSW)andgastungstenarcwelding(GTAW)wereusedtoweldAZ91Dmagnesiumalloysheetswiththethicknessof2.2mm.Theinfluenceoftheweldingparame2tersontheFSWweldqualityandmicrostructureandmechanicalpropertieswasinvestigated.Soundweldmentwasobtainedatthetoolrotatingspeedof1380r/min,whiletherotatingspeedof1960r/minwastoohigh.Themicrostructureofeachzoneshowedverydif2ferentfeatures,whichdependsonthethermalandmechanicalcondi2tions.Thehardnessandstrengthofthestirzonewereremarkablyim2provedduetothefinerecrystallizedgrainstructure.ThemechanicalpropertiesofFSWweldmentswhichweresuperiortothoseofGTAWweldmentsdependsmainlyonheatinputduringtheweldingprocess2ing.Keywords:frictionstirwelding;AZ91Dmagnesiumalloy;mechanicalpropertiesApplicationofChoi2WilliamsdistributiontoelectricalsignalsdetectoninCO2arcweldingLUOYi,WUGuangfeng,LIChuntian(SchoolofMaterialScienceandEngineering,ChongqingIn2stituteofTechnology,Chongqing400050,China).p101-103,107Abstract:Time2frequencydistributionofChoi2Williams,whichisthealgorithmmodifiedbasedonWigner2Villdistribution,wasusedtostudyarcvoltagesignalsacquiredduringCO2arcweld2ing.Thesignalswasanalyzedintime2frequencydomaintogetthetime2frequencydistributionpattern.Theinfluenceoffourparameterssuchasanalysiswindowtypeandanalysiswindowwidthoftimeandfrequencyonanalysisefficiencyofdistributionpatternwasdiscussedonthepremiseofsmoothingfac