铝/钛异种金属激光/激光-CMT复合熔钎焊工艺及其组织与力学性能  

Process,microstructures and mechanical properties of Al/Ti dissimilar metals with laser/laser-CMT hybrid welding-brazing

作　　者：王佳杰[1] 宋晓国[2] 武鹏博 胡佩佩[4] 滕彬 黄瑞生 于久灏[1] WANG Jiajie;SONG Xiaoguo;WU Pengbo;HU Peipei;TENG Bin;HUANG Ruisheng;YU Jiuhao(Heilongjiang Institute of Engineering,Harbin,150050,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150001,China;Harbin Welding Institute Limited Company,Harbin,150028,China;Shanghai Institute of Aerospace Precision Machinery,Shanghai,201600,China)

机构地区：[1]黑龙江工程学院,哈尔滨150050 [2]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001 [3]哈尔滨焊接研究院有限公司,哈尔滨150028 [4]上海航天精密机械研究所,上海201600

出　　处：《焊接学报》2023年第2期54-60,I0006,共8页Transactions of The China Welding Institution

基　　金：国家重点研发计划资助项目(2021YFB3401100);先进焊接与连接国家重点实验室开放课题研究基金资助项目(AWJ-23M23);黑龙江省自然科学基金资助项目(LH2022E102).

摘　　要：选用5A06铝合金和Ti6Al4V钛合金为母材,ER4047焊丝和粉状Nocolok钎剂为填充材料,采用激光熔钎焊和激光-CMT复合熔钎焊两种焊接方法,并对两种焊接接头的微观组织和力学性能进行对比分析.结果表明,激光熔钎焊与激光-CMT复合熔钎焊在合适的焊接工艺下均容易获得连续、稳定的焊接接头.铝/钛激光熔钎焊和激光-CMT复合熔钎焊焊缝中部组织均为α-Al固溶体和Al-Si共晶组织.激光熔钎焊和激光-CMT复合熔钎焊均在钛合金上表面处界面反应层最厚,其厚度分别小于10和6μm.激光熔钎焊焊缝偏钛侧界面主要为锯齿状,激光-CMT复合熔钎焊焊缝偏钛侧界面主要为层片状.激光熔钎焊和激光-CMT复合熔钎焊焊接接头均断裂在焊缝区,焊接接头平均抗拉强度分别为252和209 MPa,激光熔钎焊比激光-CMT复合熔钎焊接头抗拉强度高20%,而激光-CMT复合熔钎焊比激光熔钎焊焊接效率提升约1.5倍.ER4047 wire and powdered Nocolok brazing flux were selected as filler materials,and two welding methods,laser fusion brazing and laser-CMT hybrid welding-brazing,were used to join 5A06 aluminum alloy and Ti6Al4V alloy.The microstructure and mechanical properties of the two welded joints were compared and analyzed.The results show that continuous and stable welded joints can be easily obtained by laser welding-brazing and laser-CMT hybrid welding-brazing under appropriate welding process.The microstructure of the middle part of the weld of aluminum/titanium laser weldingbrazing and laser-CMT hybrid welding-brazing isα-Al solid solution and Al-Si eutectic structure.Both laser welding-brazing and laser-CMT hybrid welding-brazing have the thickest interface reaction layer on the upper surface of titanium alloy,with the thickness of less than 10 and 6μm respectively.The interface on the titanium side of the laser brazed weld is mainly serrated,and the interface on the titanium side of the laser-CMT composite brazed weld is mainly lamellar.The joints of laser welding-brazing and laser-CMT hybrid welding-brazing welding are fractured in the weld zone,and the average tensile strength of the joints are 252 and 209 MPa respectively.The tensile strength of laser welding-brazing is 20%higher than that of laser-CMT hybrid welding-brazing.The efficiency of laser-CMT hybrid welding-brazing is about 1.5 times higher than that of laser welding-brazing.

关 键 词：激光熔钎焊 激光-CMT复合熔钎焊 铝/钛异种金属 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]