Numerical simulation of slag movement from Marangoni flow for GMAW with computational fluid dynamics
Numerical simulation of slag movement from Marangoni flow for GMAW with computational fluid dynamics
复制标题
熔化极气体保护焊Marangoni流中熔渣运动的计算流体力学模拟
DOI：
10.1016/j.icheatmasstransfer.2021.105243
复制
发表时间：
2021-05-26
影响因子：
7
通讯作者：
Cheepu, Muralimohan
中科院分区：
文献类型：
--
作者：
Cho, Dae-Won;Park, Yeong-Do;Cheepu, Muralimohan
本研究通过计算流体动力学分析了熔渣（喷射模式熔化极气体保护焊过程中产生的氧化物）的行为。熔渣主要由硅酸盐（SiO2）组成，位于熔池表面。一般认为熔渣是在电弧等离子体边界周围产生的。因此，在本研究的数值模拟中，炉渣被建模为球形颗粒，具有特定的密度和尺寸。为了比较马兰戈尼流动效应，本研究调查了表面张力梯度不同（正和负）的两种不同情况。数值模拟和实验结果均发现，负表面张力梯度在焊道边缘形成困渣，正表面张力梯度在顶面中心形成困渣。
This study analyzed the behavior of molten slag, which is an oxide generated during spray mode gas metal arc welding, with computational fluid dynamics. The molten slag, composed mainly of silicate (SiO2), is located on the molten pool surface. It is generally assumed that the molten slag is generated around the arc plasma boundary. Therefore, in the numerical simulation in this study the slag is modeled as a spherical particle, which has a specific density and size. To compare the Marangoni flow effect, this study investigated two different cases where the surface tension gradients were different (positive and negative). In both the numerical simulation and experimental results it was found that negative surface tension gradient formed trapped slag on the bead edge while the positive surface tension gradient formed trapped slag on the center of the top surface.