Loading patent…
AssigneesNippon Steel Corporation, Toyota Jidosha Kabushiki Kaisha
InventorsHatsuhiko Oikawa, Yasuo Takahashi, Tohru Saito, Yutaka Okuda, Kazuo Narita, Fuminori Matsuda, Katsutoshi Ueno, Goro Watanabe
Estimating the term…
The present invention relates to a resistance welding method suitable for use in spot welding between a steel-base metal sheet, which has been plated for rust prevention purposes, and an aluminum-base metal sheet and aims to permit a current to flow at a high density across the plated steel sheet and the aluminum-clad steel sheet, thereby realizing high-quality welding. An aluminum-clad steel sheet comprised of a steel layer having projections and an aluminum layer is interposed between the plated steel sheet and the aluminum-base metal sheet to be welded to each other. An electrode is energized by a predetermined weld current from an alternating power supply. The current path is limited to the area of the projections, and metallic melt formed by melting of the plating is accommodated between the projections, preventing the current-carrying area from being increased. Consequently, the temperature of the interface of the plated steel sheet and the aluminum-clad steel sheet can be efficiently raised, resulting in the formation of a proper nugget on both sides of the aluminum-clad steel sheet.
A method for resistance welding a plated steel sheet to an aluminum-base metal sheet, comprising the steps of:
Dependencies are inferred from the claim text.