针对传统焊接方法在结构适应性、连接质量等方面的不足，提出基于合金元素控制界面结构的铝/铜异种金属填丝熔钎焊方法，即通过控制焊丝中合金元素的种类和含量达到控制接头界面结构，改善接头力学性能的目的。在设计铝/铜异种金属熔钎焊用焊丝基础上，以研究铝/铜异种金属熔钎焊特性、铝/铜熔钎焊接头微观组织与力学行为以及铝/铜熔钎焊界面反应机理和反应层生长行为为切入点，获得合金元素对液态钎料润湿性和铺展动力学的影响规律，揭示界面反应层形成机制，建立反应层生长动力学方程，阐明合金元素对界面反应和反应层生长行为的作用机理。以控制反应层组成和厚度为目标，实现对界面结构的优化，获得高质量接头。本方法的提出，为实铝/铜异种金属的优质连接提供新的思路，对于其它异种难焊金属的连接问题也有着重要的参考价值。

Due to the shortage of traditional welding methods in structure adaptability, joint quality and other aspects, welding-brazing method with filler wire for Al/Cu dissimilar metals which controls the interface structure based on alloying element is proposed. That is, to control interface structure and improve the mechanical properties of joints by controlling the type and content of alloying element in the filler wire. On the basis of designing filler wire for welding-brazing of Al/Cu dissimilar metals, the influence mechanism of alloying element on the wettability and spread dynamics of liquid solder, the formation mechanism of interface reaction layer and the reaction layer growth kinetics equation are obtained by studying the characteristics of Al/Cu dissimilar metals welding-brazing, microstructure and mechanical properties of Al/Cu welding-brazing joints as well as interface reaction mechanism and interface layer growth behavior of Al/Cu welding-brazing as point of penetration. The influence mechanism of alloying element on interface structure and mechanical properties in Al/Cu welding-brazing joints is clarified. Aimed at controlling the composition and thickness of reaction layer, the optimization of interface structure is achieved and high quality joining is obtained. With the presentation of this method, new idea is provided for high quality joining of Al/Cu dissimilar metals, which also has important reference value for other dissimilar difficult-to-be-welded metals.