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| 氦−氩混合保护气体角接头旋转激光+电弧复合焊电弧特性数值分析 |
| Numerical Analysis of the Arc Characteristics of Rotating Laser + Arc Hybrid Welding with Helium-argon Mixed Shielding Gas for Fillet Joint |
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| DOI：10.3969/j.issn.1674-6457.2023.04.018 |
| 中文关键词: 旋转激光 保护气体成分 激光+电弧复合焊 电弧动态行为 数值模拟 |
| 英文关键词: rotating laser composition of shielding gas laser + arc hybrid welding arc dynamic behavior numerical simulation |
| 基金项目:国家自然科学基金(51975263，51905232) |
| Author Name | Affiliation | | SU Xiao-yang | Jiangsu Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Jiangsu Zhenjiang 212100, China | | LIU Wen | Jiangsu Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Jiangsu Zhenjiang 212100, China | | XU Guo-xiang | Jiangsu Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Jiangsu Zhenjiang 212100, China | | SUN Ya-jie | Erzhong Zhenjiang Heavy Equipment Co., Ltd., Jiangsu Zhenjiang 212114, China | | ZHU Jie | Jiangsu Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Jiangsu Zhenjiang 212100, China | | HU Qing-xian | Jiangsu Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology, Jiangsu Zhenjiang 212100, China |
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| 中文摘要: |
| 目的 研究激光+电弧复合焊中氦−氩混合保护气体成分对电弧等离子体物理特性的影响，从而改善焊接性能。方法 综合考虑角接头几何特性和氦−氩混合保护气体的物理特性，建立氦−氩混合保护气体角接头旋转激光+电弧复合焊电弧行为的数值分析模型。使用FLUENT软件对不同体积比氦−氩保护气体下电弧等离子体的温度场、流场、压力场和电势场进行模拟计算，对比分析保护气体成分改变对电弧等离子体的影响规律，考虑其对焊接性能的影响，并将计算结果与高速摄影试验进行对比，验证数值分析模型的准确性与合理性。结果 保护气体分别为纯Ar、95%Ar+5%He、90%Ar+10%He时，电弧向激光侧偏移收缩，电弧整体形貌被压缩，位置A纵截面处电弧等离子体的峰值温度分别为25 603、25 080、23 904 K，最大流速分别为336.34、334.34、317.58 m/s，压力最大值分别为899.08、943.40、957.67 Pa，电势梯度分别为11.56、12.17、13.18 V。结论 在氦−氩混合保护气体激光+电弧复合焊中，当保护气体中氦气体积分数增加到5%和10%时，随着氦气所占比例的增大，电弧处于动态变化过程，电弧被压缩，等离子体的峰值温度逐渐降低，最大流速下降，电弧压力和电势梯度增大，有利于焊缝熔深的增大。 |
| 英文摘要: |
| The work aims to study the effect of helium-argon mixed shielding gas composition on the physical characteristics of arc plasma in laser + arc hybrid welding to improve the welding performance. In overall consideration of the geometric characteristics of the fillet joint and the physical characteristics of the helium-argon mixed shielding gas, the numerical analysis model of the arc behavior of the helium-argon mixed shielding gas rotating laser + arc hybrid welding of the fillet joint was established. The temperature, flow, pressure and electric potential field of the arc plasma under different proportion of helium-argon shielding gas were simulated and calculated with FLUENT software. The effect of the change of shielding gas composition on the arc plasma was compared and analyzed, and its effect on the welding performance was considered. The calculation results were compared with the high-speed photography experiment, which verified the accuracy and rationality of the numerical analysis model. When the shielding gas was pure Ar, 95%Ar+5%He and 90%Ar+10%He respectively, the arc shifted and contracted toward the laser side, the overall shape of the arc was compressed, the peak temperature of the arc plasma at the longitudinal section of position A was 25 603, 25 080 and 23 904 K, the maximum flow velocity was 336.34, 334.34 and 317.58 m/s, the maximum pressure was 899.08, 943.40 and 957.67 Pa, and the potential gradient was 11.56, 12.17 and 13.18 V. In the helium-argon mixed shielding gas laser + arc hybrid welding, when the helium in the shielding gas increases to 5% and 10%, the arc is in a dynamic change process with the increase of the helium ratio, the arc is compressed, the peak temperature of the plasma gradually decreases, the maximum flow rate decreases, and the arc pressure and potential gradient increase, which is conducive to the increase of the weld penetration. |
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