50mm厚板TC4及TA17钛合金真空电子束焊接工艺研究

Study on vacuum electron beam welding process of 50mm thick plate TC4 and TA17 titanium alloys

采用JMATPRO热力学软件,在分析TC4和TA17钛合金的密度、比热和导热率等特性的基础上,开展了厚度50 mm的TC4和TA17钛合金真空电子束焊接试验,设计了高压和中压加速电压,不同焊接束流和焊接速度的参数变化,研究了焊接工艺参数对焊缝熔宽和熔深及焊缝成形系数的影响作用。试验结果表明,相同焊接工艺参数条件下TC4钛合金的熔深和焊缝成形系数较TA17高,焊接束流对熔深和焊缝成形系数影响能力最为突出,加速电压150 kV的高压更适合于大厚板钛合金的真空电子束焊接。

Based on the analysis of the density, specific heat and thermal conductivity of TC4 and TA17titanium alloys by using JMATPRO thermodynamic software, the vacuum electron beam welding experiments of TC4 and TA17 titanium alloys with a thickness of 50 mm were carried out. The parameters of high and medium voltage accelerating voltage, different welding beam current and welding speed were designed. The effects of welding process parameters on weld width, penetration and weld forming coefficient were studied. The test results show that the penetration and weld forming coefficient of TC4titanium alloy are higher than TA17 under the same welding process parameters. The influence of welding beam current on penetration and weld forming coefficient is the most prominent. The high voltage of accelerating voltage 150 kV is more suitable for vacuum electron beam welding of large and thick titanium alloys.