Robotic Nd:YAG Fiber Laser Welding of Ti-6Al-4V Alloy
Robotic Nd:YAG Fiber Laser Welding of Ti-6Al-4V Alloy
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DOI：
10.3390/met7060221
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
C. Köse;E. Karaca
中科院分区：
文献类型：
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作者：
C. Köse;E. Karaca
在本研究中，使用机器人光纤激光焊接方法连接Ti6Al4V钛合金板。激光焊接过程以两种不同的焊接速度进行。研究了不同热输入条件对机器人光纤激光焊接接头组织和力学性能的影响。结果表明，与低线能量焊接试样相比，高线能量焊接试样的焊缝金属显微组织中出现了晶粒粗化现象，焊缝金属中初生α组织的体积分数增加。低线能量焊接试样焊缝金属的显微组织由篮状或针状α'晶和晶界的初生β晶组成。采用低热输入连接的试样的拉伸强度和屈服强度高于采用高热输入连接的试样，但其延展性较低。
In the present study, Ti6Al4V titanium alloy plates were joined using a robotic fiber laser welding method. The laser welding process was carried out at two different welding speeds. Effects of different heat input conditions on the microstructure and mechanical properties of robotic fiber laser welded joints were investigated. Some grain coarsening was observed in the microstructure of weld metal in samples joined using high heat input, compared to those using low heat input, and volume rates of primary α structures increased in the weld metal. The microstructure of weld metal in samples joined using low heat input was made of basket-weave or acicular α' grains and primary β grains in grain boundaries. Tensile and yield strength of samples joined using low heat input were higher than for those joined using high heat input, but their ductility was lower.