微束等离子弧焊电弧温度场的分布特征及参数影响

使用数值模拟的方法，应用ANSYS软件对微束等离子弧焊电弧温度场分布进行了计算，并且基于光谱检测和高速摄影技术对微束等离子弧焊电弧温度场的分布进行验证. 结果表明，电弧轴向温度在近钨棒处最大，距钨棒距离增加电弧温度减小；电弧径向温度在电弧中心处最大，随着径向距离增加，温度减小. 随着焊接电流的增大，电弧近钨棒端面处及其中心的温度增大. 钨棒端面半径减小，电弧近钨棒端面处及其径向中心温度增大. 归一化后数值模拟的电弧端面径向和轴向温度分布,分别与光谱检测和高速摄影电弧图像处理的电弧光辐射强度分布保持一致.

Distribution characteristics and parameters effects of MPLW arc

Temperature field distribution of the arc in micro plasma arc welding was simulated by ANSYS software, and the calculation results was validated by the spectral measurement and the image processing of high-speed photography. The results showed that the axial maximum temperature of the arc in micro plasma arc welding occurs in the area near the tungsten cathode, and the arc temperature decreases with the increasing of the distance from the tungsten tip. The maximum radial temperature of the arc in micro-plasma arc welding occurs at the center of the arc transverse, and the temperature decreases with the increasing of radial distance from the center of the arc transverse. With the increasing of welding current, the axial maximum temperature in the area near the tungsten tip and the radial maximum temperature at center of the arc transverse increase. With the decreasing of tungsten tip diameter, the axial maximum temperature in the area near the tungsten tip and the radial maximum temperature at center of the arc transverse increase. After normalizing, the numerical calculated radial and axial temperature distributions have high agreement with distribution results by using spectrum detection and image processing of high-speed photography, respectively.