Magnetohydrodynamic behaviors in a resistance spot weld nugget under different welding currents  

作　　者：S. Jack HU 

机构地区：[1]The University of Michigan, Ann Arbor, MI 48109, USA

出　　处：《Science China(Technological Sciences)》2008年第9期1507-1515,共9页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China (Grant Nos. 50705059 and 50575140);National Basic Research Program of China (Grant No. 2006CB705400)

摘　　要：Magnetohydrodynamic behaviors in a resistance spot weld nugget under different welding currents are investigated based on a multiphysics coupled numerical model, which incorporates phase change and variable electrical contact resis-tances at faying surface and electrode-workpiece contact surface. The patterns of the flow field and thermal field at the end of the welding phase under different welding currents are obtained. The evolutions of fluid flow and heat transfer during the whole welding process are also revealed systematically. The analysis results are also compared with a traditional electrothermal coupled model to obtain the quantitative effects of the magnetohydrodynamic behaviors on the resistance spot weld nugget formation.Magnetohydrodynamic behaviors in a resistance spot weld nugget under different welding currents are investigated based on a multiphysics coupled numerical model, which incorporates phase change and variable electrical contact resistances at faying surface and electrode-workpiece contact surface. The patterns of the flow field and thermal field at the end of the welding phase under different welding currents are obtained. The evolutions of fluid flow and heat transfer during the whole welding process are also revealed systematically. The analysis results are also compared with a traditional electrothermal coupled model to obtain the quantitative effects of the magnetohydrodynamic behaviors on the resistance spot weld nugget formation.

关 键 词：RESISTANCE SPOT WELDING magnetic force fluid flow heat TRANSFER 

分 类 号：TG44[金属学及工艺—焊接]