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AssigneesKabushiki Kaisha Toyota Chuo Kenkyusho, Toyota Jidosha Kabushiki Kaisha
InventorsHideaki Matsuoka, Takashi Asada, Tatsuyuki Amago, Kyosuke Izuno, Koki Nakada, Tomohiko Sekiguchi, Shuhei Ogura
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A novel spot welding method for steel sheets and an aluminum alloy sheet, includes stacked sheet materials from a pair of opposing electrodes to join the sheet materials by resistance heating. The pair of opposing electrodes are in pressure contact with both outer surfaces of the sheet sets. The sheet sets include at least a first and second steel sheet, and an aluminum alloy sheet stacked in this order. A first energization step forms a molten pool between facing surfaces of the first and second steel sheets without melting the aluminum alloy sheet. A second energization step causes a melting reaction between facing surfaces of the second steel sheet and the aluminum alloy sheet. The first and second steel sheets are joined via a first nugget. The second steel sheet and the aluminum alloy sheet are joined via a second nugget including an intermetallic compound generated by the melting reaction.
A spot welding method of energizing a set of sheets comprising a plurality of stacked sheet materials from a pair of opposing electrodes to join the sheet materials by resistance heating, the pair of opposing electrodes being in pressure contact with both outer surfaces of the set of sheets,
Dependencies are inferred from the claim text.