钛合金(TC4)电子束焊接模拟

Finite element numerical simulation of electron beam welding of TC4 titanium alloy

通过工艺试验,获得了9 mm厚TC4电子束焊接最佳工艺参数;利用有限元软件ABAQUS建立模型.结果表明,模拟焊缝形貌和表面残余应力结果与实测结果具有非常高的一致性,说明了穿透性强的圆锥热源和辐射性强的双椭球热源组成的复合热源能够有效地反应出电子束焊接特点,证明了有限元模型的正确性;进而对模拟结果进一步分析,得到焊缝周围存在较高残余应力,尤其是在焊件内部存在危险的三维拉伸应力状态.

The optimized welding parameters for electron beam welding of 9 mm thick TC4 titanium alloy plate were obtained. A finite element model was established based on ABAQUS software,and the simulated results of the weld appearance and residual stress on the weld surface agreed well with the experimental results. This proved that the combined heat source with highly penetrating cone heat source and highly irradiative dual-ellipsoid heat source could characterize the electron beam welding. Further simulated results showed that high residual stress occurred around the weld,especially,dangerous three-dimensional tensile stress existed within the weldment.