| 摩擦增材辅助Ti/Al搅拌摩擦搭接接头特征分析 |
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| 引用本文： | 吕宗亮,刘景麟,韩振宇,朱栋,万龙,黄永宪.摩擦增材辅助Ti/Al搅拌摩擦搭接接头特征分析[J].焊接学报,2022,43(6):69-74. |
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| 作者姓名： | 吕宗亮 刘景麟 韩振宇 朱栋 万龙 黄永宪 |
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| 作者单位： | 1.哈尔滨工业大学, 先进焊接与连接国家重点实验室, 哈尔滨, 150001 |
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| 基金项目： | 国家自然科学基金资助项目(52175301,52001099)； |
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| 摘 要： | 为解决Ti/Al异种材料搅拌摩擦焊接接头强度低、搅拌针磨损等问题，提出一种摩擦增材辅助搅拌摩擦搭接焊(friction addition-friction stir lap welding, FA-FSLW)技术. 该新工艺延续了固相连接的优势，具有热输入量低、界面金属间化合物薄等特点.文中研究了以6082铝合金作预沉积层辅助实现3 mm厚2A12铝合金板与4 mm厚TC4钛合金板之间的连接，焊接过程中搅拌头扎入铝沉积层而不接触钛表面，得到抗拉载荷最大为12.2 kN的接头.结果表明, FA-FSLW复合焊接头的界面迁移越大，接头承载越小.同时，发现界面处的Ti, Al元素发生了明显互扩散，Si元素在界面偏聚，与Ti, Al元素发生冶金反应后形成层状纳米级Ti-Al-Si金属间化合物，为提高接头强度奠定基础.
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| 关 键 词： | 摩擦增材 钛/铝异种材料 界面分析 元素扩散 |
| 收稿时间： | 2021-12-29 |
Characteristic analysis of friction additive assisted Ti/Al friction stir lap welding |
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| Affiliation: | 1.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China2.Kunshan World Wide Welding Co., Ltd., Kunshan, 215300,China3.Lingyun Automobile Technology Branch，Shanghai Lingyun Industrial & Technology Co., Ltd., Shanghai, 201708, China |
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| Abstract: | Friction stir lap welding assisted by friction additive (FA-FSLW) was proposed to solve the following problems during Ti/Al dissimilar friction stir welding process: low joint strength and wear of tool. This new technology contains the advantages of solid state welding, such as low heat input, thinner intermetallic compounds layer. This study selected 6082 aluminum alloys as the pre-deposition layer to assist the bonding between 3 mm thick 2A12 aluminum alloy and 4 mm thick TC4 titanium alloy plates. The tool was set into the 6082 deposition without touching the titanium surface. The joint with the maximum tensile load of 12.2 kN was obtained. The study found that the larger the interface offset, the lower the load bearing. The Ti and Al elements have undergone significant inter-diffusion during FA-FSLW process. The element of Si was segregated at the interface, and then metallurgical reacted with Ti and Al, to form a Ti-Al-Si intermetallic compound layered of nano-level, which established the foundation for high load-bearing of the joint. |
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