Dynamic simulation of metal transfer in GMAW, Part 1: Globular and spray transfer modes
Dynamic simulation of metal transfer in GMAW, Part 1: Globular and spray transfer modes
复制标题
GMAW 中金属过渡的动态模拟，第 1 部分：球状和喷射过渡模式
作者：
C. Yoo
采用流体体积法（VOF）模拟了熔滴过渡和喷射过渡的动态特性。由于焊接电流的电磁力包括在VOF算法的制定。在假设悬滴表面上的电流密度为均匀线性的条件下，考虑了焊接电弧的影响。数值计算了液滴的自由表面轮廓、压力和速度分布。结果表明，轴向流动和径向挤压力促进了液滴的分离，电磁力维持了喷雾模式下细长熔滴的锥度。熔滴表面的电流密度分布对熔滴形状、分离液滴体积和熔尖锥度的形成有重要影响。预测结果与实验数据相当吻合。
The dynamic characteristics of the globular and spray metal transfer modes are simulated by adopting the Volume of Fluid (VOF) method. The electromagnetic force due to the welding current is included in the formulation of the VOF algorithm. The effect of the welding arc is considered under the assumptions of a uniform and linear current density on the pendant drop surface. The free surface profiles, pressure and velocity distributions within the drop are calculated numerically. It is found that axial flow and radial pinch force promote drop detachment, and the taper of the elongated molten drop in the spray mode is maintained by the electromagnetic force. The current density distribution on the drop surface has significant effects on the molten drop profile, detaching drop volume and taper formation at the molten tip. Predicted results are in reasonably good agreement with the experimental data.