(1. 中國科學院 金屬研究所，沈陽 110016；
2. 中國科學院大學，北京 100049；
3. 沈陽市新利興有色合金有限公司，沈陽 110149)
摘 要: 本研究采用攪拌摩擦焊接(FSW)技術成功實現(xiàn)了8 mm厚鉛合金板材的高速焊接，得到了表面美觀、無宏觀焊接缺陷的FSW接頭。結果表明：高轉速可以促進前進側與后退側材料的充分混合，避免弱結合的產(chǎn)生；焊速加快，在高溫下停留的時間短，接頭軟化程度得到抑制，因此在高轉速和高焊速條件下能得到性能更好的鉛合金FSW接頭。在轉速800 r/min、焊速800 mm/min工藝條件下，得到了抗拉強度為34 MPa的鉛合金攪拌摩擦焊接接頭，其強度達到母材的95%；其均勻伸長率為2.5%，斷裂伸長率為7%，其均勻伸長率比母材的要大。
關鍵字: 鉛合金；攪拌摩擦焊；接頭；微觀組織；力學性能
（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
