真空电子束焊接热源建模及功率密度分析

Heat source modeling and power density analysis for vacuum electron beam welding

分析了真空电子束深熔焊接的热源作用形成钉状焊缝的特征,建立了峰值功率递增型旋转高斯体热源,即热源作用半径在深度方向呈高斯规律递减,热源功率密度在深度方向呈指数函数规律递增.利用该热源模型计算了聚焦状态和散焦状态下,真空电子束焊接特殊热效应的功率密度分布.结果表明,热源数学模型得到的功率密度分布规律符合理想状态下的电子束热源作用特征,可用于不同聚焦状态下的真空电子束焊接的热效应数值模拟研究.

The characteristics of heat source for vacuum electron beam welding of deep penetration were analyzed.On the basis of the gaussian descending for heat source radius and exponential increasing for power density of heat source along the depth,a mathematical model of whirling gaussian body source with increasing peak power was established.Under the level of focusing and defocusing,the power-density distribution for special thermal effect of vacuum electron beam welding was calculated by this model.The results of these calculations showed that the power-density distribution of the heat source model was consistent with the thermal characteristic of electron beam source based on the idealized state.And this model was applicable to the thermal-effect simulation of vacuum electron beam welding at different focus levels.