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| 2024铝合金孔洞缺陷搅拌摩擦点焊修复数值模拟与实验研究 |
| Numerical Simulation and Experimental Study of Stir Friction Spot Welding Repair of Hole Defects in 2024 Aluminum Alloy |
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| DOI：10.3969/j.issn.1674-6457.2023.07.010 |
| 中文关键词: 搅拌摩擦点焊 孔洞修复 数值模拟 材料流动 晶粒细化 |
| 英文关键词: friction stir spot welding hole repair numerical simulation material flow grain refinement |
| 基金项目:湖北省科技重大项目(2022AAA001);湖北省自然科学基金(2021CFB523);湖北省重点研发计划(2021BAA200) |
| Author Name | Affiliation | | LI Yu-wei | Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China | | HE Wu-hao | Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China
Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China | | PANG Qiu | School of Mechanical Automation, Wuhan Donghu University, Wuhan 430212, China |
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| 中文摘要: |
| 目的 薄壁构件在服役过程中会产生孔洞缺陷，传统修复方法存在连接不牢靠、周期长等问题，针对以上情况，研究了搅拌摩擦焊点焊修复材料的流动对修复接头性能的影响规律。方法 在修复焊速为20 mm/min，修复转速分别为800、1 200、1 600 r/min的条件下对2024铝合金孔洞缺陷进行搅拌摩擦点焊修复，分析不同修复转速下修复接头的微观组织和力学性能。此外，使用ABAQUS有限元软件模拟修复孔洞缺陷过程中材料流动的具体规律。结果 在修复焊速为20 mm/min、修复转速为1 600 r/min条件下，修复接头表面光滑平整，无任何缺陷存在，材料内部发生了显著的晶粒细化，从母材区到焊核区，平均晶粒尺寸由20.5 μm降低至2.7 μm，降低幅度为86.8%。数值模拟仿真结果表明，在1 600 r/min的高修复转速下，材料流动的速度梯度较大，热输入也较高，更容易获得性能优良的修复接头。结论 在修复焊速为20 mm/min的条件下，当修复转速从800 r/min增加到1 600 r/min时，修复的热输入逐渐提高，材料的流动性增强，逐渐修复了孔洞缺陷，在修复转速为1 600 r/min时获得了优质的修复接头，在焊核区发生了显著的晶粒细化现象，修复接头的抗拉强度达到了母材抗拉强度的81.3%，屈服强度几乎等同于母材的屈服强度。 |
| 英文摘要: |
| In view of the hole defects in service of thin-walled components, traditional repair methods have problems such as poor connection and long lead time. The work aims to study the effect of repairing material flow on the properties of repaired joints. The repair welding speed of 20 mm/min and the repair rotating speed of 800, 1 200, 1 600 r/min were used to repair the hole defects in 2024 aluminum alloy by friction stir welding, and the microstructure and mechanical properties of the repaired joints were analyzed under different repair welding speeds. In addition, ABAQUS finite element software was used to simulate the specific flow of material during the repair of hole defects. The results showed that at a repair welding speed of 20 mm/min and a repair rotating speed of 1 600 r/min, the surface of the repaired joint was smooth and flat without the presence of any defects, and significant grain refinement occurred within the material, with the average grain size reduced from 20.5 μm to 2.7 μm from the base material area to the weld core area, with a reduction of 86.8%. Numerical simulation showed that at the high repair speed of 1 600 r/min, the velocity gradient of material flow was greater and the heat input was higher, making it easier to obtain repaired joints with excellent performance. Therefore, it is concluded that under the condition of repair welding speed of 20 mm/min, the repair rotating speed increases from 800 r/min to 1 600 r/min, the heat input of the repair gradually increases, the material flow is stronger, the hole defects are gradually repaired, a good quality repaired joint is obtained at the repair rotating speed of 1 600 r/min, and significant grain refinement occurs in the weld core area, and the tensile strength of the repaired joint reaches 81.3% of that of the base material and the yield strength is almost equal to that of the base material. |
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