1. Key Laboratory of Hydrodynamics and Ocean Engineering, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China;
2. The Quartermaster Equipment Research Institute of the General Logistics Department of PLA, 100010 Beijing, China;
3. Key Lab of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China;
4. The State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China
The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 and AISI316 L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strain- stress curves at the strain rate around 103 s-1 were obtained by the split Hopkinson tensile bar (SHTB). The static mechanical properties of the welded joints have little changes with the laser power density and all fracture occurs at 316 L side. However, the strain rate sensitivity has a strong dependence on laser power density. The value of strain rate factor decreases with the increase of laser power density. The welded joint which may be applied for the impact loading can be obtained by reducing the laser power density in the case of welding quality assurance.
Fund:The project was supported by the National Natural Science Foundation of China (10832011).
Cite this article:
Yan-Peng Wei,Mao-Hui Li,Gang Yu et al. Effects of laser power density on static and dynamic mechanical properties of dissimilar stainless steel welded joints[J]. Acta Mechanica Sinica, 2012, 28(5): 1334-1339 .
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