宇航材料工艺http://www.yhclgy.com2023年第1期2195铝锂合金钨极氩弧焊接工艺研究温斯涵1朱文俐2孙建秋1胡正根2焦好军1(1航天材料及工艺研究所,北京100076)(2北京宇航系统工程研究所,北京100076)文摘针对2195铝锂合金在焊接时裂纹敏感性高、气孔敏感性高、易氧化等问题,开展氩弧焊接工艺研究,对焊接头的抗裂性、力学性能及显微组织进行了分析。研究表明,提高焊缝金属中的Cu含量,可以有效降低2195铝锂合金熔焊接头的裂纹敏感性,裂纹率K1=0%,K2=0%。2195铝锂合金单面双层焊接接头力学性能最佳,抗拉强度超过376MPa,延伸率达到5.5%。提高焊接试板的清理深度可以解决焊接气孔敏感性高的问题,增加氩气拖后保护及背保护措施可以有效防止焊接氧化问题。熔焊工艺研究可为2195铝锂合金的工程应用提供技术支撑。关键词铝锂合金,熔焊工艺,力学性能,微观组织中图分类号:TG442DOI:10.12044/j.issn.1007-2330.2023.01.010StudyontheTIGWeldingCraftsof2195Aluminum-lithiumAlloyWENSihan1ZHUWenli2SUNJianqiu1HUZhenggen2JIAOHaojun1(1AerospaceResearchInstituteofMaterials&ProcessingTechnology,Beijing100076)(2BeijingInstituteofAstronauticalSystemsEngineering,Beijing100076)AbstractTheweldingcraftsof2195aluminum-lithiumalloywasinvestigatedtosolvetheproblemsofhighcracksensitivity,highporositysensitivity,oxidationduringweldingof2195aluminum-lithiumalloy.Thecracksensitivity,mechanicalpropertiesandmicrostructureoftheweldjointswereanalyzed.TheresultsshowthattheincreasingCucontentinfusioncaneffectivelyreducethecracksensitivityoftheweldjoints,withK1=0%andK2=0%.Thetwopassweldedjointdisplaythebesttensileproperties.Thetensilestrengthofjointis376MPa,whiletheelongationofjointis5.5%.Theproblemofhighporositysensitivityissolvedbyincreasingthecleaningdepthoftheweldingplate.UsingpureArgasforbackwardgasandrootsidepurgegascanavoidthefusionweldingfromoxidation.Theresearchofweldingprocessprovidedtechnicalsupportfortheengineeringapplicationof2195aluminum-lithiumalloy.KeywordsAl-Lialloy,Weldingcrafts,Mechanicalproperty,Microstructure0引言锂(Li)是最轻的金属元素,密度仅为0.534g/cm3,每添加1%(w)的Li可以使合金的密度降低3%,弹性模量提高6%。2195铝锂...