( 1. 大连理工大学 三束材料表面改性国家重点实验室，
大连 116024;
2. 沈阳飞机制造有限公司 制造工程部, 沈阳 110034)
摘 要: 采用现代测试手段分析TA15钛合金活性剂补焊接头微观组织特征，探讨钛合金焊缝采用活性剂多次补焊的可行性。 结果表明： 涂有活性剂补焊接头各区域结合良好， 热影响区域小且与焊缝区过渡平缓， 没有出现明显分界； 涂活性剂焊缝区晶内组织并未因补焊次数的增加而粗大；焊缝接头主要元素Ti、 Al、 Mo、 V和Zr均分布均匀，没有因采用活性剂而出现烧损和偏聚的现象； 室温下补焊焊缝组织由α-Ti组成； 涂活性剂焊缝各补焊区硬度值接近，略低于正常焊缝区硬度。 采用活性剂对钛合金可以进行多次补焊并能够获得高质量焊缝。
关键字: TA15钛合金； 钨极氩弧焊； 活性剂； 补焊； 组织特征
（ 1. State Key Laboratory of Material Surface Modification by Laser,
Ion and Beams, Dalian University of Technology, Dalian 116024, China;
2. Department of Manufacturing Engineering,
Shenyang Aircraft Corporation, Shenyang 110034, China）
Abstract: The microstructure characteristics of TA15 titanium alloy joint multiple repaired with activated flux were analyzed by modern testing means. The results show that the interfaces of each repair zone welded with flux are joined well, the HAZ is narrow and the area from HAZ to bead transits smoothly. The microstructure of welding intracrystalline repair welded with flux does not grow up with increasing time. The major elements Ti, Al, Mo, V and Zr within the weld are distributed symmetrically, and the melting loss and segregation do not appear. In the room temperature repair joint structure is composed of α-Ti. Meanwhile the micro-rigidities of each repair zone are parallel, and are a bit lower than initial weld zone's. The repair welding of TA15 titanium alloy with flux is a mending method which can obtain high quality repairing bead.
Key words: TA15 Ti alloy; gas tungsten arc welding; flux; repair welding; structure character
