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激光焊接过程中残留液体金属的高速高倍在线观察

温鹏荻崎贤二山本元道

金属学报 doi:10.3724/SP.J.1037.2010.00591

采用高速摄像机和光学显微镜构成的摄像装置对激光焊接熔池后端的凝固行为进行高速高倍摄像, 详细记录了柱状晶从液态熔池后部析出过程以及残留在已析出柱状晶周围的液体金属的凝固行为. 采用液体Sn急冷将焊接过程中正在凝固的焊缝金属冷冻保存到室温, 并与高速高倍摄像观察到的熔池后端的凝固行为进行了对比分析. 对3种奥氏体不锈钢材料焊缝凝固过程中残留液体金属的存在范围进行了观察和比较.在线观察到的残留液体金属是焊缝金属凝固过程中固/液相共存区间的初始部分,即与熔池相连的较多的液体金属. 针对3种不锈钢材料在线观察到的残留液体金属的存在范围与热裂纹实验获得的热裂纹敏感性有较好的对应关系,为发展一种通过在线观察判断材料凝固热裂纹敏感性的方法提供了实验依据.

关键词: 激光焊接 , solidification cracking , residual liquid metal , in situ observation , quenching

NUMERICAL SIMULATION OF TEMPERATURE FIELDS FOR WELD METAL SOLIDIFICATION CRACKING IN STAINLESS STEELS

R. P. Liu , Z. J. Dong and Y. H. Wei( 1)Harbin Research Institute of Welding , Harbin 150080 , China 2)National Key Laboratory of Advanced Welding Production Technology , HIT , Harbin 150001 , China)

金属学报(英文版)

This paper has analyzed the influences of the heat input of welding arc, the latent heat of solidifica- tion,fluid flow of liquid metal on the heat conductivity pertaining to welding solidification crack of stainless steels. As a result,two - dimensional heat conduction models with prescribed heat flux mov- ing along the the have been developed that can simulate welding arc, convection and radiation heat loss from top and bottom surfaces of the workpiece. Finally, the finite element model was used to ana- lyze and calculate the temperature field.

关键词: stainless steel , null , null , null

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