第22卷
第8期
2014年8月
1004-924X(2014)08-2075-06
文章编号
光学精密工程
Optics and Precision Engineering
Vol.22No,. 8
Aug.2014
TiNi形状记忆合金/钛合金异种材料激光焊
陈玉华*，戈军委，刘套成，柯黎明
（南昌航空大学航空制造工程学院，江西南昌330063）
摘要由于TiNi合金与钛合金的物理和化学性能差异较大，故其焊接性较差，焊缝区易形成大量的金属间化合物并产生裂纹，为实现上述材料的良好连接、提高接头性能，本文对采用激光焊连接0.2mm厚TiNi形状记忆亿合金和TC，钛合金异种材料进行了探索。分别采用直接对接焊和手工填丝焊的方法，研究了焊接接头的微观组织和力学性能。结果表明，直接对接焊时焊缝中心产生了纵向裂纹；手工填丝焊则通过合适的焊接工艺，改善了焊缝成形，避免了裂纹的产生，较优的焊接工艺参数为功率百分比18%、脉冲宽度3ms、脉冲额率3Hz;在界面区，Ni与TC，形成的过渡层宽度约为2 μm，Ni与TiNi形成的过渡层宽度约为0.5μm。接头最大抗拉强度为332MPa，断裂位置发生在靠近TiNi侧的熔合线附近。
关
键
词：TiNi形状记忆合金；TC，钛合金；激光微焊接；对接焊；手工填丝坏
中图分类号：TG456.7
文献标识码：A
doi;10,3788/OPE,20142208.2075
MicrolaserweldingofdissimilarmaterialsbetweenTiNi
shapememoryalloyandtitaniumalloy CHEN Yu-hua', GE Jun-wei, LIU Fen-cheng, KE Li-ming(SchoolofAeronautical ManufacturingEngineering, NanchangHangkongUniversity，Nanchang330063，China） Correspondingauthor,E-mail:ch_yu.hu@163.com
Abstract: The physical and chemistry properties of TiNi shape memory alloy and TC, titanium alloy are quite different, so the weldability is poor and a number of intermetallic compounds and cracks will produce in the weld seam. To achieve good joining of TiNi shape memory alloy and TC, titanium alloy and improve the welded joint properties, this paper explores the micro laser welding of dissimilar ma terials between TiNi shape memory alloy and titanium alloy. The butt welding method and manual welding filler wire method are carried out for O. 2 mm thick TiNi shape memory alloy and TC, titanium alloy to obtain the microstructure and mechanical properties. The results show that longitudinal cracks are brought out in butt welding, however, the appropriate welding process for manual welding filler wire improves weld forming and avoids cracks. The optimum welding parameters are the power percentage 8%, pulse width of 3 ms, and the pulse frequency of 3 Hz. Moreover, the transition width formed by Ni and TC, is about 2 μm, and that formed by Ni and TiNi is about o. 5 μm. In the com
收稿日期：2013-11-06：修订日期：2014-01-21
基金项目：上海航天科技创新基金资助项目（No.SAST201209)；江西省自然科学基金资助项目（No.
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