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Induced electromagnetic stirring behavior in a resistance spot weld nugget. (English) Zbl 1205.78014

Summary: 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.

MSC:

78A30 Electro- and magnetostatics
76W05 Magnetohydrodynamics and electrohydrodynamics
80A20 Heat and mass transfer, heat flow (MSC2010)
76R05 Forced convection
78M10 Finite element, Galerkin and related methods applied to problems in optics and electromagnetic theory
80M10 Finite element, Galerkin and related methods applied to problems in thermodynamics and heat transfer
76M10 Finite element methods applied to problems in fluid mechanics

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References:

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