基于热源数学模型的电子束焊接仿真

Electron beam welding numerical simulation based on the mathematical model of heat source

建立合理的热源分布数学模型可以提高电子束焊数值模拟的计算精度。常用的热源数学模型有磁盘形、双椭球形和圆锥形热源分布模型。根据焊接任务,对圆锥形热源模型加以改进,建立了不等壁厚管件的电子束焊接数值分析模型,通过与物理实验进行对比,分析了电子束焊过程的温度场分布以及应力场分布,并验证了改进后热源分布数学模型的准确性。

Establishing a reasonable mathematical model of heat source distribution can improve the calculation accuracy of electron beam welding numerical simulation.The mathematical model of heat source commonly used has a disk,the double ellipsoid and conical heat source distribution models.According to the welding task,the conical heat source model is improved,set up different wall thickness pipe fittings of electron beam welding numerical analysis model,by comparing with physical experiment,electron beam welding process of the temperature field and stress field distribution are analyzed,and verify the accuracy of the improved mathematical model of heat source distribution.