Numerical simulation of heat transfer and fluid flow in a double-sided gas-tungsten arc welding process
Numerical simulation of heat transfer and fluid flow in a double-sided gas-tungsten arc welding process
复制标题
双面钨极氩弧焊过程传热和流体流动的数值模拟
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
L. Wu
中科院分区：
文献类型：
--
作者：
H. Dong;H. Gao;L. Wu
摘要 单电源双面弧焊是肯塔基大学最近开发的一种新型焊接工艺。实验表明，该工艺比传统的单面电弧焊在增强熔深、减少变形、改善凝固组织以及无需使用填充金属来防止裂纹等方面具有优势。本文针对双面钨极氩弧焊（包括平焊和立焊）中的传热和流体流动建立了三维瞬态数值模型。基于非均匀交错网格系统，利用SIMPLEC算法对控制方程进行数值求解。分析了表面张力梯度、电磁力和浮力在确定流体流动和焊缝熔深方面的作用，并与传统电弧焊工艺进行了比较。将计算的焊缝几何形状与实验结果进行比较，发现计算结果与实验结果吻合，且具有合理的精度。
Abstract Double-sided arc welding powered by a single power supply is a new type of welding process developed recently at the University of Kentucky. Experiments show that this process has advantages over conventional single-sided arc welding in enhancing penetration, minimizing distortion, improving solidification structure and welding aluminium without the necessity of using filler metal for cracking prevention. In this paper, a three-dimensional transient numerical model is developed for the heat transfer and fluid flow in double-sided gas-tungsten arc welding, including flat-position welding and vertical-up position welding. Based on a non-uniform staggered grid system, the governing equations are solved numerically using the SIMPLEC algorithm. The roles of the surface tension gradient, electromagnetic force and buoyancy force in determining the fluid flow and weld penetration are analysed and compared with those in the conventional arc welding process. The computed weld geometry is compared with experimental results and it is found that the computational results agree with the experimental results with reasonable accuracy.