基于ANSYS的Ti2AlNb钛合金电子束焊接数值模拟

为了优化Ti2AlNb钛合金的电子束焊接工艺，利用ANSYS有限元分析软件对壁厚3.5 mm的Ti2AlNb钛合金电子束焊接过程进行数值模拟，运用双椭球热源进行加载，改变电子束流以及焊接速度，分析了电子束流和焊接速度对温度场分布、熔池形貌、熔深、熔宽以及热循环性能的影响，确定了最优的焊接工艺参数。模拟结果显示，焊接速度越小，熔深越大，熔宽也越大；电子束流值越大，熔深与熔宽均增大；电子束流值越大，峰值温度越大；焊接速度越快，峰值温度越小，且升温至峰值温度的时间越短。研究表明，加速电压60 kV，电子束流值为35 mA，聚焦电流380 mA，焊接速度600 mm/min为3.5 mm厚Ti2AlNb钛合金电子束最优焊接工艺参数。

Numerical Simulation of Electron Beam Welding Process of Ti2AlNb Titanium Alloy based on ANSYS

In order to optimize the electron beam welding process of Ti2AlNb titanium alloy, the electron beam welding process of Ti2AlNb titanium alloy with wall thickness of 3.5 mm was numerically simulated by ANSYS finite element analysis software. Double ellipsoid heat source was used to load and change the electron beam current and welding speed. The effects of electron beam current and welding speed on temperature field distribution, weld pool morphology, penetration depth, width and thermal cycle performance were analyzed, and the optimal welding process parameters were determined. The results show that the smaller the welding speed is, the greater the penetration is and the wider the penetration is. The greater the electron beam current, the greater the penetration depth and width. The higher the electron beam current, the higher the peak temperature. The faster the welding speed, the smaller the peak temperature, and the shorter the time to rise to the peak temperature. The results show that the acceleration voltage is 60 kV, the electron beam current value is 35 mA, the focusing current is 380 mA, and the welding speed is 600 mm/min, which is the optimal electron beam welding process parameters of 3.5 mm wall thickness Ti2AlNb titanium alloy.