METHOD AND APPARATUS FOR RESISTANCE WELDING OF STEEL SANDWICH SHEETS
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United States of America Patent
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Oct 30, 2015
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Dec 4, 2014
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Abstract
A method for resistance welding a metallic component to a sandwich metal sheet with a thermoplastic layer disposed between two metallic cover layers may involve heating a region of the sandwich metal sheet to be welded such that the thermoplastic layer softens, displacing the thermoplastic layer from the region by compressing the cover layers, and welding the cover layers with the metallic component by means of a flow of electrical current in a first circuit via a first welding electrode disposed on a side of the sandwich metal sheet and a second welding electrode disposed on a side of the metallic component. The method for resistance welding has short cycle times, and a compact design and a process-reliable welded connection can be achieved. The method may further involve heating the region to be welded by a flow of current in a second circuit comprising the first welding electrode and an electrical conductor disposed between the first welding electrode and the sandwich metal sheet.”
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