| 摘要: |
| 基于专业搅拌摩擦焊有限元分析软件MORFEO的局部分析模块,对5 mm厚2024-T3铝合金薄板对接焊缝不同厚度处的材料流动性进行分析. 焊接速度为80 mm/min,转速为600 r/min时,对圆柱形和圆锥形搅拌针分别建模,后处理提取不同厚度水平面准稳态流线,得到材料流动特点:靠近轴肩质点运动最快;搅拌针前方质点绕过后退侧,最终沉积在搅拌针后方的后退侧,类似于回填作用;搅拌针为圆锥形时,质点可在搅拌针后方两侧均匀沉积. 在该焊接参数下,使用圆锥形搅拌针,铜箔作为标记材料进行试验,模拟结果得到了验证. |
| 关键词: 搅拌摩擦焊 数值模拟 流动性 |
| DOI： |
| 分类号: |
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| Simulation of flow patterns on different thickness of friction stir welding with different pin geometries based on MORFEO |
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XU Yan1, YANG Xinqi1, LIU Hanlong2
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1.Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China;2.Beijing Intelligent United Innovation Technology Co., Ltd., Beijing 201306, China
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| Abstract: |
| A professional friction stir welding simulation software MORFEO was used to observe flow characteristics of different thickness. 2024 aluminum alloy sheets of 4 mm thickness were butt jointed. Two local 3D models of two kinds of pin profiles were set up, namely cylindrical and conical shapes. Compared with other simulation software, MORFEO provided a more convenient and parameterized way to demonstrate each level's streamlines and gave a quasi steady state description of the material deposition which helped to predict defects caused by insufficient flow. The material close to the shoulder tended to move farther around the pin. Both sides' material flowed around the pin to the retreating side behind the moving pin and lefe large vacant space on the advancing side. Whereas when the pin was tapered and had an appropriate rotation speed such as 600 r/min in this paper, the material could be taken to both sides behind the pin on each level. Similar results had also been observed in the experiment conducted with the marker technique. |
| Key words: friction stir weld numerical simulation flow |
