摘要
为了分析钨极氩弧焊(GTAW)焊接电弧电场和磁场在三维电弧空间内的分布规律,以直流钨极氩弧焊电弧为研究对象,建立了包含电极、焊接电弧以及工件的三维瞬态联合数学模型,对AZ61A镁合金GTAW焊电弧等离子体的电场和磁场进行了数值分析,得到了电弧电势、电流密度、磁感应强度以及电磁力在三维空间的分布特征。研究结果表明,焊接电弧的电势、电流密度、电磁力的最大值均出现在电极的端部,磁感应线始终是环绕电极的一系列的闭合曲线,且其环绕方向与焊接电流的关系遵守右手螺旋定则。
In order to analyze the distributions of electric field and magnetic field in the three-dimensional( 3D)arc space, a united 3D transient numerical model was developed for a magnesium alloy AZ61 A gas tungsten arc welding(GTAW) arc to investigate electric field and magnetic field of the arc plasma, which coverd the electrode,welding arc and base matel. After that, the distribution of electric potential, current density, magnetic flux density and electromagnetic force in the arc space were obtained. The results indicated that the maximum gradient of electric potential in the whole arc space existed around the electrode tip, where the electric current density, electromagnetic force were also the maximum. It also could be seen that the magnetic induction line was a series of closed curves around the electrode, the direction of magnetic induction line and welding current was identical with right-hand rule.
出处
《焊接技术》
2015年第7期13-17,5,共5页
Welding Technology
关键词
焊接电弧
钨极氩弧焊
镁合金
电场
磁场
数值模拟
arc,GTAW,magnesium alloy,electric field,magnetic field,numerical simulation
