摇动电弧窄间隙GMAW焊温度场数值分析模型

Numerical analysis model of temperature field in swing-arc narrow gap GMAW

从宏观传热学出发,依据横断面几何形状特征,综合考虑电弧摇动、接头几何特征及焊缝表面形状对电弧热流分布特征的影响,建立了摇动电弧窄间隙GMAW焊瞬态温度场数值分析模型.利用ANSYS软件对摇动电弧瞬态温度场及热循环曲线进行了模拟计算,分析了其分布特征.结果表明,模型能够合理、准确反映摇动电弧的移动轨迹及分布特性,且焊缝横断面的计算结果与试验结果吻合较好,从而证明了模型的准确性.在焊接电流为300A,摇动频率为2 Hz时,熔池形态变化有限.

Based on macro thermal transfer theory and geometric feature of weld cross section,the heat source model for swing-arc narrow gap GMAW is developed after considering the influence of arc swing,geometric feature of welded joint and weld surface shape on arc heat flux distribution. By using ANSYS software,the transient temperature profile and thermal cycle curve in swing arc narrow gap GMAW are calculated and their distribution features are analyzed. The results show that the established heat source model can reflect the moving path of swing arc and its thermal action feature and the calculated geometry and size of weld cross section agree well with the experimental data,validating the accuracy of the developed model. At 300 A welding current and 2 Hz swing frequency,the weld pool changes limitedly.