2195铝锂合金钨极氩弧焊接工艺研究  

Study on the TIG Welding Crafts of 2195 Aluminum-lithium Alloy

作　　者：温斯涵 朱文俐 孙建秋 胡正根 焦好军[1] WEN Sihan;ZHU Wenli;SUN Jianqiu;HU Zhenggen;JIAO Haojun(Aerospace Research Institute of Materials&Processing Technology,Beijing 100076;Beijing Institute of Astronautical Systems Engineering,Beijing 100076)

机构地区：[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

出　　处：《宇航材料工艺》2023年第1期69-74,共6页Aerospace Materials & Technology

摘　　要：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376 MPa,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。The welding crafts of 2195 aluminum-lithium alloy was investigated to solve the problems of high crack sensitivity,high porosity sensitivity,oxidation during welding of 2195 aluminum-lithium alloy.The crack sensitivity,mechanical properties and microstructure of the weld joints were analyzed.The results show that the increasing Cu content in fusion can effectively reduce the crack sensitivity of the weld joints,with K1=0%and K2=0%.The two pass welded joint display the best tensile properties.The tensile strength of joint is 376 MPa,while the elongation of joint is 5.5%.The problem of high porosity sensitivity is solved by increasing the cleaning depth of the welding plate.Using pure Ar gas for backward gas and root side purge gas can avoid the fusion welding from oxidation.The research of welding process provided technical support for the engineering application of 2195 aluminum-lithium alloy.

关 键 词：铝锂合金 熔焊工艺 力学性能 微观组织 

分 类 号：TG442[金属学及工艺—焊接]