Influencing Factors of Element Distribution in Welding Pool: A Review
GAO Qian1, BAI Fang1, DING Hongsheng1, TONG Lige2, GAO Ting2, BAI Shiwu3, YU Jiangfeng4
1 School of Mathematics and Physics,University of Science and Technology Beijing,Beijing 100083; 2 School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083; 3 Pipeline Research Institute of China National Petroleum Corporation, Langfang 065000; 4 Chinese People’s Liberation Army 96819 Power Specialist Group,Beijing 100015
Abstract: The fluid flow and heat transfer in welding process has a great influence on the shape of welding pool, the absorption and accumulation of gas and inclusions, especially on the distribution of elements in the molten pool. Sufficient researches have showed that the fluid in the molten pool is mainly affected by surface tension, force and electromagnetic force, in which the effect of the surface tension is the key factor on the welding pool shape. The welding heat input and the welding speed also have different effects on the formation of the welding pool. The element interdiffusion phenomenon occurs at the interface between different materials. The diffusion coefficient is obviously distinct for diverse elements at different diffusion depth, but it is similar for the same elements. The uniform distribution of the elements has a significant influence on the quality of the welding joint. In the future, the research will focus on the specific diffusion form and the segregation of elements in the molten pool.
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2017, Vol. 31 
