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采用非线性结构分析,并建立热-结构耦合的有限元单元模型,对6mm厚AZ31B镁合金无填丝的电子束堆焊温度场的分布及焊缝形貌进行了数值模拟。焊接热源采用高斯旋转曲面体热源,可以较真实的呈现出电子束焊温度场变化情况;通过对比模拟焊缝形貌与试验所得焊缝形貌表明,该模拟较好地体现出电子束深熔焊所具有的钉子型焊缝的特点;热电耦所测温度和模拟温度场结果基本一致。
Nonlinear structure analysis and thermal-structural coupling finite element model were established to simulate the distribution of the temperature distribution and the weld morphology of the 6mm thick AZ31B magnesium alloy under wire-free electron beam deposition. The welding heat source adopts Gaussian rotating body surface heat source, which can present the change of temperature field of electron beam welding more realistically. By comparing the morphology of the welding seam and the experimental results, the simulation shows that the electron beam deep melting Welding with nail-type weld characteristics; thermocouple measured temperature and simulated temperature field results are basically the same.