TC4钛合金压力容器电子束焊接模拟分析

文中采用旋转高斯曲面体热源模型,对一定工艺条件下航天压力容器TC4钛合金试件的焊接过程进行了温度场分析,获得了温度场的分布特征及垂直焊缝方向的温度分布曲线.结果表明,利用该规格试件确定的焊接参数规范能够满足实际产品焊接的要求,热影响区温度梯度的分布情况为内部装置的保护提供了依据;并通过对"匙孔"的演变过程和不同焊接参数下的特征尺寸进行模拟分析,获得了典型关系曲线,工艺试验与模拟结果吻合较好,为获得高质量要求的焊缝提供了参考.

Study on temperature field of electron beam welding of TC4 titanium alloy pressure vessel

In order to meet the requirement of welding quality of space pressure vessel and the protection requirements of special equipment inside, it is necessary to determine the welding specification by using the specimen before welding. The temperature field of TC4 titanium alloy pressure vessel specimen under certain process conditions was studied by using the rotating Gaussian surface heat source model. The distribution characteristics of temperature field and the thermal cycle curve of welding process were obtained, and it was proved that by using the distribution of the temperature gradient in the heat affected zone of the specimen provides the basis for the protection of the internal device. By simulating the evolution of the "key hole" and the characteristic dimensions at different welding speed, the welding parameters are analyzed and determined, it can provide a reference for obtaining high-quality requirement of the welding seam.