METHOD AND DEVICE FOR RESISTANCE WELDING STEEL SANDWICH SHEETS
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United States of America Patent
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Nov 13, 2015
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Jan 21, 2015
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Abstract
A method of resistance welding a component to a sandwich sheet, which includes a thermoplastic layer disposed between two metallic outer layers, may involve heating a region of the sandwich sheet to be welded such that the thermoplastic layer softens, displacing the thermoplastic layer from the region by pressing the outer layers together, and welding the outer layers to the component by an electrical current flow for welding in a first circuit. The first circuit may include a first power source via a first welding electrode arranged at a side of the sandwich sheet and a second welding electrode arranged at a side of the component. This method is easy to run and achieves short cycle times due at least in part to the region being heated by a current flow for preheating in a second circuit that comprises a second power source and an electrical conductor that is arranged between the first welding electrode and the sandwich sheet.”
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