| 基于CEL模型的搅拌摩擦焊接7055铝合金仿真模拟 |
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| 引用本文： | 武晓燕,罗巍,王怡嵩,江海涛.基于CEL模型的搅拌摩擦焊接7055铝合金仿真模拟[J].焊接学报,2021,42(7):44. |
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| 作者姓名： | 武晓燕 罗巍 王怡嵩 江海涛 |
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| 作者单位： | 北京科技大学,高效轧制国家工程研究中心,北京,100083;北京科技大学,高效轧制国家工程研究中心,北京,100083;北京赛福斯特技术有限公司,北京,101107 |
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| 基金项目： | 航空科学基金资助项目(20181174001)；广西创新驱动发展专项基金项目(桂科AA17202008). |
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| 摘 要： | 基于耦合的欧拉—拉格朗日(CEL)模型，建立了高可靠性、高精度的搅拌摩擦焊7055铝合金热力耦合计算模型，开展了焊接工艺参数对7055铝合金焊接接头温度、等效应变以及缺陷预测结果的影响规律的研究，并分析和讨论了搅拌摩擦焊试验验证模拟结果的可靠性. 7055铝合金搅拌摩擦焊CEL模型预测结果表明，温度和等效塑性应变与转速呈正比，与焊接速度呈反比，这主要与焊接工艺参数影响轴肩与7055铝合金的摩擦生热及材料的流动，使焊接温度和等效塑性应变值发生变化有关.当焊接速度在60 ? 300 mm/min、转速在300 ? 1 200 r/min范围内，焊接温度均低于7055铝合金熔点，当焊接速度增加到300 mm/min时，由于产热不足，温度和等效塑性应变均降低，此时在焊接接头处容易产生孔洞缺陷.7055铝合金搅拌摩擦焊试验结果表明，当转速为600 r/min、焊接速度为180 mm/min时，7055铝合金接头组织致密，接头抗拉强度达到489 MPa，断后伸长率为4.0%.当焊接速度提高至300 mm/min时，接头抗拉强度为411 MPa，断后伸长率仅为1.0%.这与产热不足导致接头处结合较差有关，与模拟结果一致.
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| 关 键 词： | 欧拉—拉格朗日模型 搅拌摩擦焊 焊接工艺参数 |
| 收稿时间： | 2020-08-11 |
Simulation on friction stir welding 7055 aluminum alloy based on CEL model |
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| Affiliation: | 1.National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing, 100083, China2.Beijing FSW Technology Co., Ltd., Beijing, 101107, China |
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| Abstract: | Based on the coupled Eulerian-Lagrangian (CEL) finite element model, a thermal-mechanical coupling calculation model of friction stir welding 7055 aluminum alloy with high reliability and precision was established. The effects of welding process parameters on temperature, equivalent strain and porosity defects of 7055 welded parts were predicted and analyzed. The friction stir welding experiment was conducted to verify the accuracy of the CEL model. The predicted results showed that the temperature and equivalent strain were proportional to the rotation speed of the stirring head and inversely proportional to the welding speed. This was mainly related with the frictional heat generation and material flow between the shoulder and the aluminum alloy sheet, which resulted in changes in the welding temperature and the equivalent strain value. When the welding speed was in the range of 60 ? 300 mm/min and the rotation speed was in the range of 300 ? 1 200 r/min, the welding temperature was lower than the melting point of 7055 aluminum alloy. When the welding speed was reached to 300 mm/min, the welded joints were prone to form weld porosity defects due to the lower temperature and equivalent strain caused by insufficient heat generation. The friction stir welding experiment results indicated that when the welding speed was 180 mm/min and the rotation speed was 600 r/min, the friction stir welded joints of 7055 aluminum alloy had compact microstructure. The tensile strength and elongation was 489 MPa and 4.0% respectively at this condition. When the welding speed was reached to 300 mm/min, the tensile strength was 411 MPa and the elongation was only 1.0%. This was related with the poor join caused by insufficient heat. The experimental results were in accordance with the simulated results. |
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