激光焊,脉冲氩弧焊,电子束焊焊接钛材机械性能的比较

目的：比较激光焊、电子束焊、脉冲氩弧焊焊接钛的机械性能，寻求一种高质量的牙科焊钛方式。方法：采用Ｉｎｓｔｒｏｎ万能拉伸实验机测试焊接区的拉伸负荷、屈服负荷，计算伸长量，用扫描电子显微镜观察断口情况，用金相显微镜观察焊接区的金相变化，并测量焊接区的显微硬度。结果：激光焊钛的拉伸负荷与电子束焊、脉冲氩弧焊无明显区别；激光焊Ｔｉ－６Ａ１－４Ｖ的拉伸负荷与脉冲氩弧焊、电子束焊及原材料无明显区别。激光焊接区的显微硬度及热影响区最小，脉冲氩弧焊的显微硬度及热影响区最大。结论：激光焊接较脉冲氩弧焊及电子束焊更适用于牙科焊接钛。

Study on the mechanical properties of the joinings between titanium fragments welded with laser,electron beam and pulse argon arc

Objectives: To compare the mechanical properties of the joinings between titanium (Ti) fragments welded with laser, electron beam and pulse argon arc. Methods:Tensile load,yield load and absolute elongation were measured with Instron testing machine. Fractured surface was observed under SEM.Metallographic change was examined with metallographic microscope.Microhardness was also detected,Results:Tensile load of Ti joining welded with laser made no difference from that welded with electron beam or pulse argon arc.Tensile load of Ti-6Al-4V joining welded with laser was not significantly different from that welded with electron beam or pulse argon arc. The microhardness of the laser joining and the range of heat affected zone were the smallest,while the microhardness of titanium joining welded with pulse argon arc and the heat affected zone were the biggest.Conclusion:laser welding might be more suitable for titanium welding in dentistry.