基于旋转电弧的GTAW填丝焊熔滴过渡数值模拟
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摘要
旋转电弧传感器的使用增加了焊接过程的变量。旋转电弧与其他因变量之间的耦合,使得GTAW填丝焊过程更为复杂。利用商业CFD软件Fluent对旋转电弧GTAW填丝焊熔滴过渡进行数值模拟,不仅可以了解熔滴过渡的物理本质,也可以为科学制定焊接工艺提供理论指导。简化焊接原型,得到熔滴过渡的二维计算模型,网格化模型并确定边界条件,然后对熔滴过渡过程进行数值模拟,得到旋转电弧GTAW填丝焊熔滴过渡的形态。为了验证模拟结果与实际情况是否相符,通过高速摄像得到了实验过程中熔滴过渡的形态。结果表明,两者吻合较好。
The use of rotating arc sensor increases variables of welding process. The coupling between rotational arc and other dependent variables makes the GTAW wire filling process more complicated. The commercial CFD software Fluent was used to simulate the droplet transfer in rotating arc GTAW wire filling welding. The numerical simulation could not only analyse the physical essence of droplet transfer, but also provides theoretical guidance for drafting welding process scientifically. The welding prototype was simplified as the two-dimensional calculated model, the mesh model was established and the boundary conditions were determined. Then the droplet transfer process was simulated, and the morphology was obtained. In order to verify whether the simulation results were in consistent with actual situation, the morphology of the droplet in experimental process was obtained by a high-speed camera. The result show that the two are in good agreement.
The use of rotating arc sensor increases variables of welding process. The coupling between rotational arc and other dependent variables makes the GTAW wire filling process more complicated. The commercial CFD software Fluent was used to simulate the droplet transfer in rotating arc GTAW wire filling welding. The numerical simulation could not only analyse the physical essence of droplet transfer, but also provides theoretical guidance for drafting welding process scientifically. The welding prototype was simplified as the two-dimensional calculated model, the mesh model was established and the boundary conditions were determined. Then the droplet transfer process was simulated, and the morphology was obtained. In order to verify whether the simulation results were in consistent with actual situation, the morphology of the droplet in experimental process was obtained by a high-speed camera. The result show that the two are in good agreement.
引文
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[3]吴东升,华学明,叶定剑,等.MIG焊接熔池形成与凝固过程数值模拟[J].焊接,2015(9):6-11.
[4]任重阳,余圣甫,晋家兵.高铬铸铁型药芯焊丝熔滴过渡及飞溅试验研究[J].焊接,2015(3):23-26.
[5]贾剑平,张华,徐健宁.电弧传感器的研究现状与展望[J].焊接,2005(11):11-15.
[6]彭小飞.镁合金DE-GMAW熔滴过渡数值模拟[D].南昌:南昌大学,2016.
[7]DingXueping,Li Huan,YangLijun,et al.Numerical simulation ofmetal transfer processin tandem GMAW[J].The International Journal of Advanced Manufacturing Technology,2013,69(1):107-112.
[8]张赛钰.AZ31B镁合金双弧焊接熔滴行为的FLUENT模拟[D].南昌:南昌大学,2016.
[9]王宗杰.熔焊方法及设备[M].沈阳:沈阳工业出版社,2006.
[10]Chen Shujun,Zhang Suolai,Huang Ning,et al.Droplet transfer in arcing-wire GTAW[J].Journal of Manufacturing Processes,2016,23:149-156.