中文摘要：

针对旋转电弧窄间隙MAG焊焊缝成形研究需要,采用Ansys软件对旋转电弧窄间隙MAG焊接温度场进行数值模拟,研究焊缝成形的影响因素.考虑旋转电弧窄间隙MAG焊特点,实现热源模型旋转加载和旋转电弧窄间隙焊接三维温度场数值计算,模拟温度场结果与试验焊缝形貌吻合良好.为进一步提高计算效率,根据热源等效和旋转电弧热源分布特点,提出了一种类似马鞍形圆环的等效热源,侧壁熔深模拟结果与实际较符合,且计算效率大为提高.研究结果为进一步的熔深控制和焊接变形研究奠定基础.

英文摘要：

To meet the reserach demand of weld formation in narrow gap MAG welding,the welding temperature field was numerically simulated by Ansys to study the affecting factors.Considering the characteristics of this welding method,rotating load of the heat source model was realized and three-dimensional temperature field numerical calculation was obtained. The numerical simulation results of weld shape and the experimental results of actual welding were in good agreement. In order to further improve the computational efficiency,a similar saddle ring equivalent heat source was proposed according to heat equivalent and characteristic of heat source distribution. The simulation results of sidewall penetration agreed well with the practical measurement,and the calculation speed was greatly improved. The results were helpful for the further research on penetration control and welding deformation.