Visualization of arc plasma and molten wire behavior in CO2 arc welding process by three-dimensional numerical simulation
Visualization of arc plasma and molten wire behavior in CO2 arc welding process by three-dimensional numerical simulation
复制标题
通过三维数值模拟可视化 CO2 电弧焊过程中电弧等离子体和熔丝行为
DOI：
10.1007/s40194-020-00958-4
复制
发表时间：
2020
影响因子：
2.1
通讯作者：
Hirata Y.
中科院分区：
文献类型：
--
作者：
Ogino Y.;Asai S.;Hirata Y.
在CO2焊接过程中，采用自耗丝电极，存在熔滴过渡现象。然而，当电弧电流较大时，熔丝行为变得不稳定，从而导致很大程度的飞溅。在本研究中，建立了包括电弧等离子体和熔丝的三维统一模型，并通过数值模拟可视化了它们的行为。在数值模拟中，当电弧电流为300A时，熔滴过渡模式为球状过渡。另外，当熔滴变得不均匀时，熔丝被电弧等离子体推高，过渡模式变为排斥过渡。对称和非对称情况下的温度分布和金属蒸气浓度分布有很大不同。当液滴形状接近对称时，金属蒸气集中在电弧等离子体的中心，电弧等离子体的整体温度下降。相反，当液滴形状不对称时，高温区和金属蒸汽区被分离。数值结果表明，电弧等离子体的性质随熔丝行为的不同而发生显著变化。
In the CO2welding process, a consumable wire electrode is used and metal transfer phenomena are involved. However, when the arc current is high, the molten wire behavior becomes unstable, and it leads to a large degree of spattering. In this study, a three-dimensional unified model comprising both the arc plasma and the molten wire was constructed, and the behavior of them was visualized using numerical simulations. The transfer mode is regarded as globular transfer in the numerical simulation with an arc current of 300 A. In addition, when the molten metal droplet becomes asymmetrical, the molten wire is pushed up by the arc plasma, and the transfer mode becomes repelled transfer. The temperature distribution and the metal vapor concentration distributions in the symmetrical and asymmetrical cases are significantly different. When the droplet shape is close to symmetrical, the metal vapor concentrates at the center of the arc plasma and the overall temperature of the arc plasma decreases. In contrast, when the droplet shape is asymmetrical, the high-temperature region and metal vapor region are separated. The numerical results showed that the properties of the arc plasma are significantly changed depending on the molten wire behavior.
影响因子：
4.1
作者：
BRACKBILL, JU;KOTHE, DB;ZEMACH, C
通讯作者：
ZEMACH, C
GMAW 中金属过渡的动态模拟，第 1 部分：球状和喷射过渡模式
影响因子：
2.2
作者：
C. Yoo
通讯作者：
C. Yoo
DOI：
10.1088/0022-3727/28/8/008
发表时间：
1995
期刊：
Journal of Physics D
影响因子：
--
作者：
S. W. Simpson;P. Zhu
通讯作者：
P. Zhu