工业纯钛TA2/紫铜T2异种金属CMT焊接接头的微观组织和腐蚀性能
Microstructure, bonding mechanism and corrosion property of titanium TA2/copper T2 welded joint by cold metal transfer technology
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摘要: 采用冷金属过渡技术(CMT)对工业纯钛TA2和紫铜T2异种金属薄板进行对接焊.焊接过程中,使焊丝偏向铜的一侧,铜母材和焊丝熔化形成熔焊接头,熔化的填充材料润湿钛母材,形成钎焊界面,实现钛和铜的熔钎焊连接.使用扫描电镜(SEM)、能谱分析(EDS)和力学试验研究焊接接头的组织以及连接机理.在室温下10%HCl溶液中,研究钛/铜异种金属CMT焊接接头的腐蚀行为.结果表明,钎焊界面由TiCu,Ti2Cu,AlCu2Ti等多种金属间化合物组成;焊缝区由铜基固溶体和Ti-Cu-Al-Ni-Fe五元素析出相组成;接头的抗拉强度达到205 MPa;焊接接头在室温10%HCl溶液中腐蚀7天后,钎焊界面出现腐蚀沟槽,14天后自行断裂.Abstract: This paper described a fundamental investigation of titanium TA2-copper T2 butt joint by cold metal transfer (CMT). During the welding process, wire was deviated from the edge of Cu sheet. A satisfied Ti-Cu CMT welding-brazing butt joint was obtained. Fusion welding joint was formed at copper side, while brazing joint was formed at titanium side. Welding-brazing joint was formed between titanium TA2-copper T2. Bonding mechanism of the welded joints was examined by scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) and tensile tests. Corrosion tests of Ti/Cu welded joint were conducted in solution of 10% HCl at room temperature. Results indicated that brazing interface consisted of various intermetallic compounds, i.e. Ti2Cu, TiCu, and AlCu2Ti. And the weld metal was composed of α-Cu solid solution and Ti-Cu-Al-Ni-Fe multi-phase. The tensile strength of the joint can reach to 205 MPa. There were corrosion grooves in brazing interfaces after corrosion for 7 days, and self-fracture after corrosion for 14 days.
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