磁场和活性剂联合作用下TIG焊热源模型的确定

为了确定磁场和活性剂联合作用下TIG焊热源模型,分别采用双椭圆面热源模型和双椭球体热源模型对焊接熔池的温度场分布进行了数值模拟,根据模拟结果的等值线分布情况可以获得熔池形状.通过将试验值和模拟值进行对比可以发现,利用双椭球体热源模型得到的熔池形状与实际熔池尺寸相吻合,而双椭圆面热源模型不能很好地反应厚度方向上的温度分布.结果表明,双椭球体热源模型可以更加准确地表征磁场和活性剂联合作用下TIG焊的实际焊接过程,打破了以往依照焊接方法选取热源模型的传统.

Determination of heat source model for TIG welding under combined effect of magnetic field and active agent

In order to determine the heat source model for TIG welding under the combined effect of magnetic field and active agent, the numerical simulation was performed for the temperature field distribution of welding pool with adopting both double oval surface heat source model and double ellipsoid body heat source model. And thus, the shape of welding pool can be obtained according to the contour distribution in the simulated results. Through comparing the experimental and simulated values, it can be found that the shape of welding pool, obtained with the double ellipsoid body heat source model, is coincided with the actual size of welding pool, while the temperature distribution in the thickness direction can not be well reflected with the double oval surface heat source model. The results show that the double ellipsoid body heat source model can more accurately characterize the actual welding process of TIG welding under combined effect of magnetic field and active agent, which breaks the previous tradition of selecting the heat source models in accordance with the welding methods.