殷钢薄板材料激光焊接试验研究

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1、大连理工大学硕士学位论文殷钢薄板材料激光焊接试验研究姓名：周秋菊申请学位级别：硕士专业：机械电子工程指导教师：吴东江20071201大连理工大学硕士学位论文TheResearchonLaserWeldingofThinInvar36AlloyPlateAbstractInvar36flloyinthefee-丫phaseisatypicalalloywithlowthermalexpansioncoefficientunderthel'oomtemperatme，whichcanbeappliedtomakehighprecisi

2、ondevices,thepartsrequiredinvariabledimensionsinappearancesandscientificinstruments，theshadow-maskofLED。liquefiedgastankersandcompositetoolingsintheaerospace。Inparticular,wi也thedevelopmentofmicroelectronies，Invar36alloyiswidelyusedinlithographymachinesinrecentyears．Th

3、erefore,itisveryessentialtoinvestigatetheweldingtechnology"andpropertiesofthisalloy．LaserweldingtechnologyofInvar36alloyisallinnovativeandimmatureissue，sotheresearchonthisaspecthassignificanttheoryandapplicationvalues．Inthispaper,aninvestigafionaboutlaserweldingofthin

4、Invar36alloyplateexperimentswascarriedoutbasedonlaserthermalconductionweldingtheorywithmillisecondp山∞Nd：YAGlaser．Wi也referencetoNd：YAGpulselasercharacteristics,one-dimensionalthermalconductionmodelWasusedtodiscusstheheatingandmeltingproblemsintheprocessoflaserthermalco

5、nductionwelding．Thethresholdoflaserpowerdensity，whichmadetheInvar36alloymelted,wascalculatedandtheinfluencingfactorstothebiggestpenetrationdepthwerediscussed．Thepreliminaryprocessingparameters，whichpreparedforthefollowinglaserweldingexperiments，WCI'edeterminedafterhow

6、theweldqualitiesWasinfluencedbytheprocessingparameterswasanalyzed．Laserbead-on-plateweldingexperimentswereconductedontwokindsofthinplates(O．5mmand0．Smm)withone-wayexperimentalmethod．Theinfluenceoftheparameters,includinglaserpower,pulseenergy，pulseduration,weldingspeed

7、anddefocusingdistance，onthequalityandsnrfaeemorphologyoftheweldbeadwereinvestigatedandtheexperimentalresultsWereanalyzedcombinedwiththelaserthermalconductionweldingtheory．Atlast，theproperprocessparametersbeingappliedtobuttweldfortwokindsofthinplates(o．5mmandO．Snun)wer

8、egainedaftertestingandanalysisoftheweldbeadwidth，penetrationdepthand$urfae七morphologyinbead-on-plateweldingexperiments．髓emic