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윤진오,양영수,신희윤,Yun, Jin-Oh,Yang, Young-Soo,Shin, Hee-Yun 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.1
Finite element analysis for induction heating process including magnetic and thermal situations is presented. Because magnetic and thermal material properties vary with the temperature, material properties depending on temperature are considered. As the inductor moves, the solution domains corresponding to the inductor change into those of the air and the solution domains corresponding to the air change into those of the inductor. For these reasons, modeling of induction heating process is very difficult with a general purpose commercial programs. In this paper, three dimensional analysis of induction heating process for moving inductor is analyzed using moving coordinate. The skin effect is confirmed inside the steel plate in the electro-magnetic analysis. The distribution of heat generation at the initial state is different from that at the quasi-stationary state. Therefore, material properties depending on temperature must be considered. The calculated results of finite element analysis agree well with the experimental temperature results. This approach is suitable to solve magneto-thermal coupled problems.
윤진오(Jin Oh Yun),양영수(Young-Soo Yang),신희윤(Hee Yun Shin),정우남(Woo Nam Juhng) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.9
In this paper, finite element analysis of induction heating process was presented. Magnetic and thermal material properties vary with the temperature in the analysis of induction heating. Therefore, magnetic and thermal analysis considering material properties according to temperature is required. As the inductor moves in the process, the solution domains of air and inductor change with the time step. In this paper, analysis of induction heating process for moving inductor was analyzed using moving coordinate. The results of finite element analysis were compared with the experimental results.
이정수,윤진오,정상훈,박철규,안영호,Lee, Jeong-Soo,Yun, Jin-Oh,Jeong, Sang-Hoon,Park, Chul-Gyu,An, Young-Ho 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.2
In this study, newly developed welding consumables for EGW were welded in EH 36 TM steel plates and their welded joints were evaluated in point of mechanical properties and microstructures compared with imported consumables. Newly developed welding consumables were evaluated as good arc stability and slag fluidity, substantially the same with imported products. The tensile strength of all welded joints were sufficient to meet the requirements specified in a ship’s classification(490~640MPa) and all areas of fracture were heat affected zone(HAZ). Charpy absorbed energy values of all EG welded metals were sufficient to meet the requirements of classification(min. 34J) and those of newly developed wires were evaluated to be better than those of imported wires. As a result observing microstructures of single and tandem EG welded metals through optical and scanning electron microscope (OM&SEM), no grain boundary ferrite(PF(G)) were created in a prior austenite grain boundary and a volume fraction of a fine acicular ferrite were observed very high.