(1. 西北有色金属研究院，西安 710016；
2. 西安交通大学 材料科学与工程学院，西安 710049)
摘 要: 对Ti35合金和Nb用钨极氩弧焊及爆炸复合两种工艺方法进行连接试验，通过光学显微镜、扫描电镜和能谱仪研究了两种工艺方法对Nb/Ti35连接界面附近组织形貌和成分的影响。结果表明：爆炸复合方法连接Ti35合金与Nb，在界面附近会产生爆炸旋涡，爆炸旋涡卷入大量Ti-Ta-Nb混合物，结合界面存在熔化缝隙，这些形貌特征和成分不利于接头在腐蚀性环境中使用。Nb/Ti35氩弧焊接的焊接接头界面处未发现孔洞等不结合缺陷，Nb在焊缝界面处呈梯度过渡，焊接接头具有较好的力学性能，氩弧焊工艺方法连接Ti35合金与Nb较为可行。
关键字: Ti35合金；铌；氩弧焊；爆炸复合；界面
（1. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;
2. School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China）
Abstract:The dissimilar metal joints of Ti35 titanium alloy to Nb were carried out with explosive cladding and argon tungsten-arc welding (TIG) processes. The effects of processes on metallographic microstructure and composition besides the bonding interfaces were investigated by means of optical microscope, scan electron microscope and energy spectrum. The results show that molten region in swirl and molten fracture layers comprised of Ti-Ta-Nb mixtures occur along the interface of Nb/Ti35 exploding joint. This is disadvantageous for joint to using in corrosive conditions. However, molten fracture layers are not observed in the TIG joint. Nb content is changed slowly along the interface of Nb and welding seam. Adequate mechanical properties are also obtained in the welding joint. These results indicate that TIG process is feasible to bonding Ti35 alloy and Nb.
Key words: Ti35 alloy; niobium; argon tungsten-arc welding; explosive cladding; interface
