工业纯钛TA2的焊接

本文根据工业纯钛TA2随着温度升高时的表面颜色变化，分析TA2焊接时的保护范围，经过计算确定焊接温度场，采用钨极氩弧焊对TA2进行对接焊接试验，通过外观检验、金相检验和力学性能检验来确定TA2的焊接工艺参数。实验结果表明，随着温度的升高，TA2表面颜色从银白色变为金黄色、蓝色、灰色、淡黄色，400℃时TA2表面颜色为金黄色，为保证焊接质量，在此温度以上需要保护；试样的拉伸、弯曲、显微硬度均满足要求，说明试验中的焊接参数符合要求，可以指导实际生产。本文也讨论了实际操作需注意的问题以获得良好的焊接接头质量。

The Welding of Industrial Pure Titanium TA2

In this study, basing on the surface color of TA2 with the increase of temperature, the range of protection of industry pure titanium TA2 is analyzed during welding, and the welding temperature field is determined by calculation, TIG is used for butt--joint weld test, reasonable welding parameters are made through the appearance, mechanical properties and microstructure tests. The experiment results have indicated that the surface color of TA2 changed from silver, golden , blue, gray to light yellow, it＇ s needed to be shielded so that the perfect welding quality can be obtained , because the surface color of TA2 is golden at 400℃ ; the mechanical properties about tensile, bending and HV hardness of the sample meet the requirements, it suggests that the weld parameter comply with the requirements and can guide the practical production in this study. Meanwhile the practical operation problems are also discussed in this paper to obtain satisfactory joint.