TA2/5083异种合金电弧熔钎焊接头组织和性能研究  

Microstructure and Properties of Arc Brazed Joint of TA2/5083 Dissimilar Alloy

作　　者：廖志谦[1] 雷小伟[1] 胡伟民[1] 马照伟 余巍[1] 路全彬 常云峰 方乃文[3] 于华 林三宝 LIAO Zhiqian;LEI Xiaowei;HU Weimin;MA Zhaowei;YU Wei;LU Quanbin;CHANG Yunfeng;FANG Naiwen;YU Hua;LIN Sanbao(Luoyang Ship Material Research Institute,Henan Luoyang 471023,China;Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,China Academy of Machinery,Zhengzhou 450001,China;Harbin Welding Institute Limited Company,China Academy of Machinery,Harbin 150028,China;Longmen Laboratory,Henan Luoyang 471000,China;HIT Zhengzhou Research Institute,Zhengzhou 450000,China)

机构地区：[1]洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所),河南洛阳471023 [2]中国机械总院集团郑州机械研究所有限公司,郑州450001 [3]中国机械总院集团哈尔滨焊接研究所有限公司,哈尔滨150028 [4]龙门实验室,河南洛阳471000 [5]哈工大郑州研究院,郑州450000

出　　处：《精密成形工程》2025年第4期234-242,共9页Journal of Netshape Forming Engineering

基　　金：国家重点研发计划(2022YFB3705605)。

摘　　要：目的研究钛铝异种合金电弧熔钎焊接头微观组织与力学性能的分布特征,分析电弧熔钎焊在钛铝异种合金连接中的可行性与优势。方法采用5183焊丝和交流TIG电弧优化焊接工艺,以较低的热输入实现钛铝异种合金的熔钎焊连接,利用光学显微镜与扫描电子显微镜,对焊接接头的微观结构进行详细分析,并对焊接接头进行显微硬度测试与拉伸性能测试。结果采用TIG熔钎焊可以获得满足NB/T 47013Ⅱ级要求的焊接接头。熔钎焊接头的Ti/Al界面处形成了锯齿状金属间化合物层,厚度为1.6~3.4μm,成分主要为TiAl3和AlTi3;接头平均拉伸强度为127 MPa,断裂位置位于铝合金熔合线附近。结论金属间化合物层并未对接头强度造成不良影响,焊缝的平均硬度高于铝合金母材及其热影响区硬度,采用电弧熔钎焊技术进行钛铝异种合金焊接,能够获得组织性能较好的焊接接头。The work aims to explore the distribution characteristics of microstructure and mechanical properties in TIG arc brazed joints of titanium-aluminum dissimilar alloys and analyze the feasibility and advantages of TIG arc brazing for joining these alloys.To achieve this,an optimized TIG arc brazing process with 5183 filler wire and alternating current(AC)was employed,which enabled the brazing of titanium-aluminum alloys with the minimum heat input.The microstructure of the brazed joints was analyzed through optical microscopy and scanning electron microscopy(SEM),and their mechanical properties were evaluated through microhardness and tensile tests.The joints meeting the NB/T 47013II level requirements were successfully produced by TIG arc brazing process.At the Ti/Al interface,a serrated intermetallic compound layer,approximately 1.6-3.4μm thick,formed,predominantly composed of TiAl3 and AlTi3.The average tensile strength of the joint was 127 MPa,with fracture occurring in the heat affected zone on the aluminum alloy side.Overall,the intermetallic compound layer does not negatively affect the joint strength,and the average hardness of the weld is higher than that of the aluminum alloy base material and its heat affected zone.These findings demonstrate that TIG arc brazing is an effective method for joining titanium-aluminum dissimilar alloys,resulting in joints with favorable microstructure and mechanical properties.

关 键 词：钛/铝异种合金 电弧焊 熔钎焊 显微组织 力学性能 

分 类 号：TG444.1[金属学及工艺—焊接]