Induced electromagnetic stirring behavior in a resistance spot weld nugget  

作　　者：LI YongBing1,LIN ZhongQin1,2,LAI XinMin1,2,CHEN GuanLong1,2 & ZHANG Ke3 1 Shanghai Key Laboratory of Digital Autobody Engineering,Shanghai Jiao Tong University,Shanghai 200240,China 2 State Key Laboratory of Mechanical System and Vibration,Shanghai Jiao Tong University,Shanghai 200240,China 3 Welding Engineering Institute,Shanghai Jiao Tong University,Shanghai 200240,China 

出　　处：《Science China(Technological Sciences)》2010年第5期1271-1277,共7页中国科学（技术科学英文版）

基　　金：the support of National Natural Science Foundation of China (Grant Nos.50705059,50605044);National Basic Research Program of China ("973" Program)(Grant No.2006CB705400);General Motors Collaborative Research Laboratory at Shanghai Jiao Tong University

摘　　要：A multi-physics hybrid numerical model,which couples electric,magnetic,thermal and flow fields,was used to investigate electromagnetic stirring behavior in a resistance spot weld nugget.The differences of two kinds of different excitation inputs,i.e.,a sinusoidal current and its root-mean-square(RMS) value,were studied to examine if they could produce equivalent electromagnetic stirring effects in the weld nugget.Research showed that the two types of current inputs could produce almost identical fluid flow and heat transfer patterns and consistent evolution of flow and thermal fields in the nugget.At the end of the welding cycles,the maximum flow velocity and temperature between the two inputs differed by 11.6% and 0.3%,respectively.Therefore,the RMS current can be assumed to produce an approximately equivalent electromagnetic stirring effect with the sinusoidal current,and can be used in the future research to greatly improve the solution efficiency of the electromagnetic stirring behavior in the resistance spot weld nugget.A multi-physics hybrid numerical model,which couples electric,magnetic,thermal and flow fields,was used to investigate electromagnetic stirring behavior in a resistance spot weld nugget.The differences of two kinds of different excitation inputs,i.e.,a sinusoidal current and its root-mean-square(RMS) value,were studied to examine if they could produce equivalent electromagnetic stirring effects in the weld nugget.Research showed that the two types of current inputs could produce almost identical fluid flow and heat transfer patterns and consistent evolution of flow and thermal fields in the nugget.At the end of the welding cycles,the maximum flow velocity and temperature between the two inputs differed by 11.6% and 0.3%,respectively.Therefore,the RMS current can be assumed to produce an approximately equivalent electromagnetic stirring effect with the sinusoidal current,and can be used in the future research to greatly improve the solution efficiency of the electromagnetic stirring behavior in the resistance spot weld nugget.

关 键 词：INDUCED magnetic field electromagnetic STIRRING RESISTANCE SPOT welding fluid flow heat transfer 

分 类 号：TG40[金属学及工艺—焊接]