(1. 哈爾濱工業(yè)大學(xué)(威海) 山東省特種焊接重點實驗室，威海 264209；
2. 哈爾濱工業(yè)大學(xué)先進(jìn)焊接與連接國家重點實驗室，哈爾濱 150001)
摘 要: 采用Zn-2%Al(質(zhì)量分?jǐn)?shù))藥芯焊絲對5052鋁合金和H62黃銅進(jìn)行TIG熔釬焊搭接試驗，并對接頭顯微組織、界面層結(jié)構(gòu)及力學(xué)性能進(jìn)行分析。結(jié)果表明：Zn-2%Al藥芯焊絲在黃銅母材表面潤濕性良好，能夠獲得較好的鋁/黃銅熔釬焊接頭。在黃銅側(cè)過渡區(qū)形成塊狀和條狀的AlCu脆性金屬間化合物相，同時在黃銅側(cè)界面處形成Cu9Al4、CuZn金屬間化合物層。隨焊接熱輸入的增大，界面層厚度先增大后減小，接頭拉伸載荷也是先增大后減小。焊縫中心區(qū)及界面層的顯微硬度高于鋁和黃銅母材的。接頭拉伸時斷于黃銅側(cè)界面區(qū)，且斷口為解理斷裂。
關(guān)鍵字: 鋁/黃銅異種金屬；TIG熔釬焊；藥芯焊絲；顯微組織；力學(xué)性能
（1. Shandong Provincial Key Laboratory of Special Welding Technology,
Harbin Institute of Technology at Weihai, Weihai 264209, China;
2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China）
Abstract:5052 aluminum alloy and H62 brass dissimilar metals were welded by TIG welding-brazing lap using Zn-2%Al (mass fraction) flux-cored wire. Microstructure, interface layer structure and mechanical properties of the joint were studied. The results show that favorable welding-brazing joints are obtained due to the excellent wettability of molten Zn-2%Al on the surface of brass. The massive and strip AlCu intermetallic compounds (IMCS) form in the transition zone at the brass side, meanwhile, Cu9Al4 and CuZn intermetallic compound layers form at the interface. The interface layer thickness and tensile load of joint increase at first and thendecrease with the increase of welding heat input. The micro-hardnesses of weld center and the interface layer are higher than those of aluminum and brass base metals. Tensile test results show that the joint fractures at interface layer of the brass side with cleavage fracture surface.
Key words: Al/brass dissimilar metals; TIG welding-brazing; flux-cored wire; microstructure; mechanical property
