雙絲埋弧焊熱源模型研究.pdf

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3、modeloftwinwiresubmergedarcweldingSpeciality：MaterialProcessingEngineeringName：HuShasha(signatu舊出S逝選Instructor：LiXiao(signature)自：幺￡絲ABSTRACTTwinwiresubmergedarcwelding(SAW)iskeytechnologyinhighstrengthlinepipefabricatio

4、n，itincreasesweldingspeedandhi曲depositionrateremarkablyHowevertheoreticalresearchingandapplicationaboutweldingtemperaturefieldofthetwinwiresubmergedarCweldingiscurrentlystillkeepinthelevelofsinglewireweldingstageAsimplem

5、athematicalmodel，whichCanaccuratelyexpresstemperaturefieldandthermalcycleoftwinwireSAWisveryimportantforcontrollingweldingperformanceofheataffectedzoneandgettinghighqualitypipesBasedonweldingheatsourcemodelandclassicweld

6、ingtemperaturefieldmodelRosenthalmodel，aparameter亭isdeterminedthroughtheoreticalderivationmethodanddatafittingmethod，whichisintroducedintheequationstocharacterizetheefficiencyofeachuniquewireintwinwireweldingAsetofsimple

7、peaktemperatureandts／5equationsareacquired，whichareveryfitforengineeringapplicationAtthesametime，thecriticalthicknessesofthickplateandthinplateintwinwiresubmergedarCweldingarealsodefinedBasedonsolutionsofthickplateandthi

8、nplateintwinwireSAWthethermalcycleofintermediatethickplatearedeterminedbyinterpolationmethodTheaccuracyoftheproposedequationsfortwinwireSAWareverifiedwithfiniteelementmethodandexperimentalmethod，especiallytheaccuracyofpe

9、aktemperatureandcoolingtimets／5，theresultsshowthetheoreticalmodelisreasonableThermalcycleparametertg／5havegreatinfluenceonthephasetransformationandpropertiesofHAZ，SOthenewconceptequivalentheati11putisintroducedbasedonitT

10、hevaluesofts／5duringtwinwireSAWwithdifferentweldingheatinputsanddifferentdistancebetweentwowiresarecalculated，andanequationisdeterminedthroughdataregressiontocharacterizetherelationshipbetweents／5andweldingparametersUnde

11、rconditionofproducingsamets／5，singlewiretw5equationandtwinwiret8／5equationareconnectedtogetherandthentheheatiIlputofsinglewireweldingisdefinedasequivalentheatinputoftwinwireSAWTheequivalentheatinputconceptisverifiedwithe