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1、addition,thetensiletestofjointsweldedunderdifferentprocessingparameterswereconducted,andthetensilepropertieswererelatedtothemacro-morphologyandmicrostructureofjoints.Whenthejointobtainstheappropriatemacro-dimensionsandfinegrainsinthefusionzone,itgetsthebesttensilepropertiesandfractur
2、esinthebasemetalaftertensiletest.Themorphologyoffracturesurfacewasexaminedviaascanningelectronmicroscope.Itisvisiblethatlargequantityofdimplesisformedonthefracturesurfaces,revealingthattheweldedjointfailsinaductilemode.Finally,accordingtothefeatureofweldshapeoflaserwelding,acombinedh
3、eatsourcemodelofdoubleellipsoidbodyheatsourceandgausssurfaceheatsourcewasestablished.ThedynamicsimulationoftemperaturedistributionoflaserweldingwasrealizedbyusingFEsoftwareABAQUSandtheusersubroutinewhichisintheFORTRANlanguage.Fromtheaspectofmacro-morphology,theweldingpoolboundaryinsi
4、mulationisinaccordancewiththefusionboundaryinexperiment,whichverifythereliabilityofmodel.Fromtheaspectofmicrostructure,thetemperaturedistributioncanpredictthetemperaturegradientofliquidandthecoolingrateofweldcenter,andfurtherpredictthetendencyofsolidificationmodeandtherelativesizeofg
5、rainsqualitatively.Sotherelationbetweenthetemperaturedistributionandmicrostructureofweldisstudied.Keywords:Laserwelding;Microstructure;Mechanicalproperty;Temperaturedistribution;FiniteelementsimulationIII萬(wàn)方數(shù)據(jù)目錄中文摘要......................................................................
6、.................................................IAbstract.......................................................................................................................II目錄.......................................................................................................
7、...................IV第1章緒論.................................................................................................................11.1研究背景.........................................................................................................11.2304不銹鋼的傳統(tǒng)焊接方法...............
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