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ID:36516941
大小:2.21 MB
页数:62页
时间:2019-05-11
《殷钢薄板材料激光焊接试验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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