Huang Qing-feng, Zhang Jian-zhong, Jiang Wei-dong, Li Quan, Yu Jin-xing
Department of Prosthodontics, Ninth People' Hospital, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China.
Shanghai Kou Qiang Yi Xue. 2004 Oct;13(5):412-5.
This study evaluated the mechanical properties and microstructure of the joints of laser-welded dissimilar alloys usually used in clinical nowadays.
The dissimilar alloys for Co-Cr alloy,Ni-Cr alloy and pure titanium were laser-welded. The joints were tested for the ultimate tensile strength (UTS) and the ultimate bending strength (UBS). The tensile fracture surfaces were examined by scanning electron microscopy (SEM). Metallurgical analysis was also performed on polished longitudinal sectioned samples.
Laser-welded dissimilar alloys between Co-Cr and Ni-Cr alloy can yield satisfactory mechanical properties, and there was no significant difference of UTS and UBS between Co-Cr welding wire group and Ni-Cr welding wire group (P>0.05). The laser-welded joints for dissimilar metal of pure titanium and Co-Cr,pure titanium and Ni-Cr, showed more brittle characteristics and severe defects (pores and cracks).
With Co-Cr or Ni-Cr welding wire, the laser-welded dissimilar alloys of Co-Cr alloy and Ni-Cr alloy can yield satisfactory joints. But pure titanium and Co-Cr alloy, pure titanium and Ni-Cr alloy cannot be directly melted together.
本研究评估了现今临床常用的激光焊接异种合金接头的力学性能和微观结构。
对钴铬合金、镍铬合金和纯钛的异种合金进行激光焊接。对接头进行极限拉伸强度（UTS）和极限弯曲强度（UBS）测试。通过扫描电子显微镜（SEM）检查拉伸断裂表面。还对抛光的纵向切片样品进行了金相分析。
钴铬合金与镍铬合金之间的激光焊接异种合金可产生令人满意的力学性能，钴铬焊丝组和镍铬焊丝组之间的UTS和UBS无显著差异（P>0.05）。纯钛与钴铬、纯钛与镍铬的异种金属激光焊接接头表现出更脆的特性和严重缺陷（气孔和裂纹）。
使用钴铬或镍铬焊丝，钴铬合金与镍铬合金的激光焊接异种合金可产生令人满意的接头。但纯钛与钴铬合金、纯钛与镍铬合金不能直接熔合在一起。
