简介:摘 要:在我国的科学技术发展水平不断进步的今天,自动焊接技术应用环节作为管道模块化生产中的重要组成部分,为管道的模块化预制提供优质高效的技术保障。且目前油田薄壁管主要采用TIG自动焊,因此探讨TIG自动焊技术在管线焊接中有效的发展方向是及其有价值的。本文从管线自动焊技术现状、优点、设备等方面进行了介绍,最终分析了TIG自动焊技术存在问题,并提出了解决措施。
简介:Adigitalman-machineinteractionsystemcontrolledbycommunicationsbetweentwoprocessorsofTMS320F240andAT98C2051wasresearchedinthepaper.Thesystemiseasytosetandmodifyweldingprocessparametersbykeyboards,anddisplayinformationofweldingsitebyLCD(LiquidCrystalDisplay).Asonepartofmulti-tasksystemaboutTIGweldingmachine,thecoordinationofman-machineinteractionsystemwithothertasksisthemainpointtothestabilityandreliabilityofitsoperation.Experimentsresultindicatesthatthesystemisstable,operation-flexible,highprecision,andanti-interfering.
简介:FSWandTIGwereconductedon316Lstainlesssteel.Variationduringmicrostructureandpropertiesinjointsobtainedbydifferentweldingmethodswasstudied.TheresultsshowthattheeffectofseveremechanicalstirringandintenseplasticdeformationcreatafinerecrystallizedgrainintheweldingjointduringFSW.AsforTIG,thetemperatureofweldingjointexceedsthemeltingpointofweldedmaterialitself.Theentireweldingprocessbelongstothesolidificationofasmallmoltenpool;andthemicrostructureofthejointtakesonatypicalcastingstructure.Whentheweldingparameterswereselectedappropriately,theaverageultimatetensilestrengthofFSWjointscanreach493MPa,whichis83.6%ofbasemetal;theaverageelongationis52.1%ofbasemetal.TheaverageultimatetensilestrengthofTIGjointsis475MPa,whichis80.5%ofbasemetal;theaverageelongationis40.8%ofbasemetal.ThetensiletestofFSWjointsissuperiortotheTIGjoints.ThemicrohardnessofFSWjointcomparedtobasemetalandTIGjointhavingasignificantimprovement,whicharel95.5HV,159.7HVand160.7HV,respectively;grainrefinementstrengtheningplaysanimportantroleinenhancingthemicrohardness.TheelectrochemicalcorrosiontestsshowthatthejointofFSW316Lausteniticstainlesssteelhasagoodcorrosionresistance.
简介:摘要气孔是铝合金TIG焊焊接工艺中常见的缺陷,本文结合焊接实践,对气孔缺陷类型和气孔形成原因进行了深入分析,并总结出了其产生的规律,为采取何种工艺措施,避免气孔的产生,积累了一定的技术资料。
简介:Thetungsten-inert-gas(TIG)arcweldingexperimentsofcementedcarbideYG30andsteel45werecarriedoutusingtheNi-Fe-Cfillingalloys.Theetaphasesandmechanicalpropertiesofweldedjointswereanalyzedbymeansofscanningelectronicmicroscope(SEM),transmissionelectronicmicroscope(TEM)coupledwithselecteddiffraction,electronicprobemicroanalysisandbendingstrengthmethods.Theexperimentalresultsshowthatthechemicalcompositionofthefillingalloysaffectsetaphaseformation.Whenthecarbonandnickelcontentsinfillingalloysare0.61wt%and55.29wt%,respectively,noetaphasesform.Andthejointbendingstrengthisthehighestto1.352GPa.Butiftheyare0.01wt%and55.38wt%,theetaphasesareformedattheboundariesofthecementedcarbideandtheweld,andthethicknessofetaphaselayerisabout110micrometers.Andthejointbendingstrengthislow.Usually,theseetaphasesareanomalouslygranular,andeasytoaccumulateattheboundariesbetweencementedcarbidesandtheweld.TheyaremultipleM6Crichintungstenandiron.