Effects of laser power density on static and dynamic mechanical properties of dissimilar stainless steel welded joints  

作　　者：Yan-Peng Wei Mao-Hui Li Gang Yu Xian-Qian Wu Chen-Guang Huang Zhu-Ping Duan 

机构地区：[1]Key Laboratory of Hydrodynamics and Ocean Engineering,Institute of Mechanics,Chinese Academy of Sciences [2]The Quartermaster Equipment Research Institute of the General Logistics Department of PLA [3]Key Lab of Mechanics in Advanced Manufacturing,Institute of Mechanics,Chinese Academy of Sciences [4]The State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences

出　　处：《Acta Mechanica Sinica》2012年第5期1334-1339,共6页力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (10832011)

摘　　要：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 AISI316L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strainstress 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 depen- dence 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.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 AISI316L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strainstress 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 depen- dence 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.

关 键 词：Laser welding Dynamic mechanics Strain rate.Power density 

分 类 号：TG457.11[金属学及工艺—焊接]