Srimaneepong Viritpon, Yoneyama Takayuki, Kobayashi Equo, Doi Hisashi, Hanawa Takao
Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Kanda-Surugadai, Chiyoda-ku, Japan.
Dent Mater J. 2005 Dec;24(4):541-9. doi: 10.4012/dmj.24.541.
Mechanical properties of laser-welded castings of Ti-6Al-7Nb alloy, CP Ti, and Co-Cr alloy were investigated and compared to the unwelded castings using a tensile test. Dumbbell-shaped specimens were cut at the center, and two halves of the specimens were welded with an Nd:YAG laser welding machine at 220 or 260 V of laser voltage. The mechanical strength of 260 V groups was higher than that of 220 V groups for Ti-6Al-7Nb and Co-Cr alloys except for CP Ti. All 260 V laser-welded castings of Ti-6Al-7Nb alloy and CP Ti, which fractured outside the welded joints, exhibited ductile characteristics, while all laser-welded Co-Cr alloy castings, which fractured within the welded joints, showed brittle characteristics. This study proved that the mechanical strength of laser-welded Ti-6Al-7Nb alloy and CP Ti castings was as high as that of unwelded castings, while the mechanical properties of laser-welded alloy joints were influenced by microstructural changes.
研究了Ti-6Al-7Nb合金、纯钛（CP Ti）和钴铬合金激光焊接铸件的力学性能，并通过拉伸试验与未焊接铸件进行了比较。在中心处切割出哑铃形试样，试样的两半使用Nd:YAG激光焊接机在220V或260V激光电压下进行焊接。对于Ti-6Al-7Nb合金和钴铬合金，除了纯钛外，260V组的机械强度高于220V组。Ti-6Al-7Nb合金和纯钛的所有260V激光焊接铸件在焊接接头外部断裂，表现出韧性特征，而所有在焊接接头内断裂的激光焊接钴铬合金铸件则表现出脆性特征。本研究证明，Ti-6Al-7Nb合金和纯钛激光焊接铸件的机械强度与未焊接铸件一样高，而激光焊接合金接头的力学性能受微观结构变化的影响。
