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1、山東大學(xué)博士學(xué)位論文激光+GMAW-P復(fù)合熱源焊焊縫成形的數(shù)值模擬姓名：胥國(guó)祥申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：材料加工工程指導(dǎo)教師：武傳松;SuckJooNa20091026山東大學(xué)博十學(xué)何論文應(yīng)用已建立的復(fù)合熱源焊的組合式體積熱源模型，對(duì)激光+GMAW-P復(fù)合熱源焊的熱場(chǎng)進(jìn)行數(shù)值分析，定量研究不同電弧功率對(duì)激光+GMAW-P復(fù)合熱源焊熱影響區(qū)寬度和熱循環(huán)參數(shù)等熱場(chǎng)特征基礎(chǔ)數(shù)據(jù)的影響規(guī)律，并與純激光焊、單GMAW-P的情況進(jìn)行了比較，為從冶金上揭示復(fù)合熱源焊的特點(diǎn)奠定了基礎(chǔ)。為更合理地選定熱源分布參數(shù)，將光線追蹤法與線熱源小孔模
2、型相結(jié)合，較詳細(xì)和準(zhǔn)確地描述了激光束在非對(duì)稱小孔內(nèi)的多次反射過程以及孔壁對(duì)光能的Fresnel吸收，研發(fā)出新的小孔形狀尺寸算法。將小孔尺寸與激光焊體積熱源分布區(qū)域相聯(lián)系，提出了基于小孔模型的激光焊體積熱源模式。將此熱源模式應(yīng)用于激光焊和復(fù)合焊焊縫成形的數(shù)值模擬。結(jié)果表明，計(jì)算結(jié)果與實(shí)驗(yàn)結(jié)果吻合良好。關(guān)鍵詞：復(fù)合熱源焊，激光焊，GMAW-P，組合式體積熱源，焊縫成形，溫度場(chǎng)，小孔，數(shù)值模擬山東大學(xué)博十學(xué)侍論文Numericalsimulationofweldformationinlaser+GMAW-Phybridweld
3、ingABSTRACTAsanew-stylehigh—qualityandhigh—efficiencyjoiningtechnique，laser+pulsedGMAW(GMAW-P)hybridweldingcombinesthebenefitsofbothlaserbeamwelding(LBW)andGMAW-Pandhasthesynergisticeffectof“1+1>2”．Thus，itisofsignificantpotentialinindustrialapplications．Uptonow,h
4、owever,mostofstudiesonhybridweldinghavejustfocusedontheparameteroptimizationbyexperiments，andthereisalackoffundamentalinvestigationsinvolvingitsphy’sicalmechanism．Sincehybridweldinginvolvesmoreweldingparameterscomparedwithsingleweldingprocess，itsphysicalprocessis
5、morecomplicated．So，determiningtheprocessparametersonlybyexperimentsrequiresvastamountsofmanpowerandmaterialresources，therebyhinderingitsfurtherspreading．Inthisstudy,usingthenumericalsimulationtechnique，theweldformationandthermalfieldcharacteristicsinlaser+GMAW-Ph
6、ybridweldingareinvestigatedthroughdevelopingtheadaptiveheatsourcemodel，thusprovidingthetheoreticalbasisandreferencedataforstudyofhemtransfermechanismandweldingparameteroptimization,whichisofgreattheoreticalsignificanceandpracticalvalue．Afterconsideringthegeometry
7、characteristicsofweldcrosssectionandanalyzingthethermalactionfea：turesindeep-penetrationlaserwelding，fouradaptiveandsuitablerotaryvolumetricheatsourcesfordeep—penetrationlaserweldingaredeveloped，i．e．powerpeakdensityexponentiallyincreasing-conicheatsource，powerpea
8、l(densitylinearlyincreasing-logarithmiccurverotatedbodyheatsource，powerpeakdensitylinearlyincreasing—paraboliccurverotatedbodyheatsourceandpowerpeakdensityhype
