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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. Differences of two kinds of different excitation inputs, ie, 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. Before, the RMS current can be assumed to produce an equivalent capacity stirring effect with the sinusoidal current, and can be used in the future research to greatly improve the solution efficiency of the electromagnetic stirring beh avior in the resistance spot weld nugget.