(1. 中国科学院 金属研究所，沈阳 110016；
2. 中国科学院大学，北京 100049；
3. 沈阳市新利兴有色合金有限公司，沈阳 110149)
摘 要: 本研究采用搅拌摩擦焊接(FSW)技术成功实现了8 mm厚铅合金板材的高速焊接，得到了表面美观、无宏观焊接缺陷的FSW接头。结果表明：高转速可以促进前进侧与后退侧材料的充分混合，避免弱结合的产生；焊速加快，在高温下停留的时间短，接头软化程度得到抑制，因此在高转速和高焊速条件下能得到性能更好的铅合金FSW接头。在转速800 r/min、焊速800 mm/min工艺条件下，得到了抗拉强度为34 MPa的铅合金搅拌摩擦焊接接头，其强度达到母材的95%；其均匀伸长率为2.5%，断裂伸长率为7%，其均匀伸长率比母材的要大。
关键字: 铅合金；搅拌摩擦焊；接头；微观组织；力学性能
（1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Shenyang Xinlixing Non-ferrous Metal Alloy Co., Ltd., Shenyang 110149, China）
Abstract:In this study, Pb-Sn alloy sheets with thickness of 8 mm were subjected to friction stir welding (FSW) under various welding parameters. The results show that high rotation rates promote the mixture of material in the stirred zone, which is beneficial to avoid the formation of void defects. Meanwhile, a faster traverse speed reduces the duration of welding tool at high temperatures, which can restrain the soft of material during FSW. Thus, higher rotation rates and faster traverse speeds are beneficial to obtain FSW joints of Pb alloys with high strength. Under the rotation rate of 800 r/min and welding speed of 800 mm/min, a sound FSW joint is obtained with the ultimate tensile strength (UTS) of 34 MPa, reaching to 95% of that of the parent metal. The uniform elongation and elongation to failure of this joint are 2.5% and 7%, respectively.
Key words: Pb alloy; friction stir welding; joints; microstructure; mechanical property
