铜/钛异种金属激光焊接头组织及力学性能  

Microstructure and mechanical properties of laser welded joints of copper/titanium dissimilar metals

作　　者：张杰 徐建洲 谢宇航 张佳[2] 黄健康[2] Zhang Jie;Xu Jianzhou;Xie Yuhang;Zhang Jia;Huang Jiankang(Gansu Electric Apparatus Research Institute,Tianshui 741018,Gansu,China;State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]甘肃电器科学研究院,甘肃天水741018 [2]兰州理工大学,有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《焊接》2024年第7期23-28,37,共7页Welding & Joining

基　　金：国家自然科学基金资助项目(52175324)。

摘　　要：【目的】铜/钛异种金属焊接在航空航天、核工业等领域具有重要的潜在应用前景。该文旨在实现铜(T2)和钛(TA2)之间的连接。【方法】采用激光焊对铜/钛异种金属进行焊接工艺试验,分别对不同激光功率下接头宏观形貌、微观组织和力学性能进行分析。【结果】结果表明,采用激光焊可以实现铜/钛接头的有效连接,接头呈现熔钎焊形式,由铜侧热影响区、熔合区和钛侧热影响区组成;当激光功率为1.8 kW时,接头的抗拉强度为127.2 MPa,约为铜母材的53%;显微硬度最小值处于铜侧,断裂发生在铜侧。随着激光功率的增加,熔钎焊界面形成Cu-Ti金属间化合物,厚度约为34μm,使其成为接头处的薄弱点。【结论】合理控制激光功率可有效抑制金属间化合物的生成,提高接头的力学性能。这些发现不仅为铜与钛的激光焊接提供了有价值的参考,也为进一步优化异种金属接头的设计和制造工艺提供了重要的试验依据。[Objective]Welding of copper/titanium dissimilar metals has important potential application prospects in aerospace,nuclear industry and other fields.The purpose of this paper was to realize connection between copper(T2)and titanium(TA2).[Methods]Welding procedures test of copper/titanium dissimilar metals was carried out by laser welding.Macroscopic morphology,microstructure and mechanical properties of welded joints under different laser powers were analyzed.[Results]The results showed that effective connection of copper/titanium welded joints could be realized by laser welding.Welded joints presented the form of welding-brazing,which was composed of heat affected zone on the copper side,fusion zone and heat affected zone on the titanium side.When laser power was 1.8 kW,tensile strength of welded joints was 127.2 MPa,which was about 53%of copper base metal.Minimum microhardness was on the copper side,and fracture occurred on the copper side.With the increase of laser power,Cu-Ti intermetallic compound with thickness of about 34μm was formed at the welding-brazing interface,making it a weak point in welded joints.[Conclusion]Reasonable control of laser power could effectively inhibit formation of intermetallic compounds and improve mechanical properties of welded joints.These findings not only provided valuable reference for laser welding of copper and titanium,but also provided important experimental basis for further optimizing design and manufacturing process of dissimilar metal welded joints.

关 键 词：钛 铜 激光焊 显微组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]