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| 回填式搅拌摩擦点焊接头多点拉剪行为研究 |
| Tensile-shear Behavior of Refill Friction Stir Spot Welded Multi-Point Joints |
| Received:August 29, 2019 Revised:November 10, 2019 |
| DOI：10.3969/j.issn.1674-6457.2019.06.006 |
| 中文关键词: 回填式搅拌摩擦点焊 2219铝合金 多点接头 力学性能 数值模拟 |
| 英文关键词: refill friction stir spot welding 2219 aluminum alloy multi-point joint mechanical properties numerical simulation |
| 基金项目:国家自然科学基金（U1637601） |
| Author Name | Affiliation | | ZOU Yang-fan | 1. Shaanxi Key Laboratory of Friction Welding Technologies, State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China | | WANG Fei-fan | 2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China | | LI Wen-ya | 1. Shaanxi Key Laboratory of Friction Welding Technologies, State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China | | YANG Xia-wei | 1. Shaanxi Key Laboratory of Friction Welding Technologies, State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China | | CHU Qiang | 1. Shaanxi Key Laboratory of Friction Welding Technologies, State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China | | GU Chen | 3. Capital Aerospace Machinery Co., Ltd., Beijing 100076, China |
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| 中文摘要: |
| 目的 研究焊点数量及分布对回填式搅拌摩擦点焊接头力学性能的影响。方法 选取2 mm的2219-O和8 mm的2219-CS铝合金板，采用试验研究和数值模拟相结合的方式，研究不同焊点数量（2点、3点和4点）及焊点分布对回填式搅拌摩擦点焊接头力学性能的影响，以及在拉剪力作用下接头的应力分布状态。结果 多点接头成形良好，无飞边、毛刺产生；随着焊点数量的增加，接头力学性能逐渐提高，并且当上板受力侧焊点数量分布较多时，接头承载力较高。结论 在拉剪过程中，靠近上板受力侧的焊点承受较大作用力。当受力侧仅有一个焊点时，该焊点附近应力集中比较明显；当受力侧有两个平行焊点时，焊点平分载荷。当焊点数为4且呈正四边形分布时，接头承载力较高。 |
| 英文摘要: |
| The paper aims to investigate the influence of the number and distribution of welding spots on the mechanical properties of refill friction stir spot welded joints. 2 mm 2219-O and 8 mm 2219-CS aluminum alloy were selected. A combination of experiment and numerical simulation was used to study the effect of welding spots number (2 points, 3 points and 4 points) and their distribution on the mechanical properties and the stress distribution under the shear test. The results showed that the multi-point joint was well formed, without flash and burr. With the increase of welding spots, the mechanical property of joints was improved gradually. When more welding spots were distributed on the stressed side of the upper plate, the joint strength was higher. The simulation results show that in tensile –shear test, the welding joints near the stressed side of the upper plate bear the larger force. When there is only one welding spot on the stressed side, the stress concentration near the welding spot is obvious. However, when there are two solder joints parallel to the stressed side, the joint stress distribution is more uniform. Therefore, when there are 4 solder joints and the distribution is quadrilateral, the mechanical properties of joints are higher. |
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