船体结构的焊接工艺外文文献

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1、AnewalgorithmonweldingprocessofT-shapedplatesinshiphullstructuretominimizedistortionbasedonthermalsimulationMehdiIranmanesha,NavidAzadaandMahmoodZabihpoorb,∗aMarineEngineeringDepartment,AmirkabirUniversityofTechnology,Tehran,Iran;bSpaceTechnologyCenter,Tehran,Iran(Received2

2、8April2013;accepted28January2014)InthispaperTheinfluenceofweldingsequenceonthedistributionofdistortiononaT-shapedplatebarisinvestigated.Thesimulationconsistsofsequentiallycoupledthermalandmechanicalanalysesusinganelementbirthanddeathtechniquetomodeltheadditionofweldingmetal

3、totheworkpiece.ThermaldistributioninsteelT-shapedplatesubjectedtogasmetalarcweldingisdeterminedthroughfiniteelementmethod(FEM)innumericalsimulations.Three-dimensional(3D)thermalmodelissimulatedinANSYSFEMcommercialcode.AmacrocodeprogrammebasedonGoldakmodelisdevelopedtoapplyt

4、hermalloadinggeneratedbytheheatsources.Theanalysesareplannedtobeperformedfor3D,transientandnon-linearconditions.Temperaturedistributionduringwelding,welding-induceddistortionfieldsandthermalgraphsarepredicted.Theresultsarecomparedwiththepredictionsfrommechanicalanalyses.The

5、resultsoffourweldingsequencesonthemagnitudeofdistortionintheplatearediscussedandtheireffectsonthethermalsmoothdistributionforspecialpointsintheplatearestudied.Evaluationoftheresultswithminimumdistortionrepresentsproperpredictionsandprovesapplicabilityandsimplicityofthenewin

6、troducedalgorithminthispaper.Keywords:weldingsequence,thermalsimulation，minimumdistortion,finiteelementmodeling171.IntroductionHightemperatureconcentrationisgeneratedinjointsectionsduetomeltstateoccurringinweldingprocess.Increasingtemperature,non-uniformtemperaturedistribut

7、ionandcoolingratecausedistortioninweldingpieces.Ontheotherhand,occurrenceofdistortioncouldinducedeformationinthestructurecomponentsthroughwhichthetolerancesconsideredmaybeunsatisfied(Brustetal.2010).Hence,inordertominimisedistortionontheplatesunderwelding,asuitableweldingse

8、quenceisdevelopedthroughgeneratinguniformthermaldistribution.Asuitableweldingseque