|Alternative Title||Investigation of weld pool flow, heat and mass transfer in laser welding of 304SS and Ni|
|Place of Conferral||北京|
|Keyword||异种激光焊接 传导焊接 深熔焊接 数值模拟 热质输运|
With the advantages of concentrated energy density of the laser heat source, high processing efficiency and easy automation, laser welding technology for dissimilar metals stands out from various dissimilar metal fusion technologies and is used in large numbers in industries such as chemical, aerospace and vehicle engineering. The differences between the thermal properties of dissimilar base metals can lead to more challenging weldability than laser welding with the same metal, and the mixing and redistribution of alloy components during the welding process makes the mechanisms affecting the quality of the weld more complex. For example, differences in melting points lead to different melting sequences between the two metals, which can cause damage to the mechanical properties of the weld, and the formation of intermetallic compounds (IMCs), which can occur when the alloying elements reach a certain concentration during the mixing of the metal components. However, the process of laser welding of dissimilar metals involves many physical effects, and the parameters and process conditions that influence the final weld are so complex that it is extremely challenging to regulate the defects and composition of the weld and to achieve a target depth of melt with low thermal stress, and strain and a dense and fine microstructure. These objectives are closely related to the dynamic changes in heat and alloying element concentration in the melt pool, and it is one of the main trends in research to link the mesoscopic transport behaviour of the melt pool with the macroscopic mechanical properties and microstructure of the weld. Therefore, this paper combines the practical application of engineering for the important needs of laser welding of dissimilar metals, based on the status of relevant research, for dissimilar metal laser welding multi-physical field phenomenon, refining the scientific aspects of the impact of thermal mass transport in the melt pool during the welding process. This paper investigates the behavioural characteristics of heat and mass transport in the melt pool of dissimilar metals welding in conduction mode and keyhole mode, respectively, using a solver (based on the finite volume method and SIMPLE algorithm) for three-dimensional heat and mass transfer problems in laser welding as an example. The main contents and findings of this paper are as follows.
|李梓洵. 304SS和Ni激光焊接的熔池流动及传热传质研究[D]. 北京. 中国科学院大学,2021.|
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