Electric heating – Metal heating – For bonding with pressure
Patent
1997-08-11
1998-07-21
Walberg, Teresa J.
Electric heating
Metal heating
For bonding with pressure
219 93, 219 94, B23K 1114, B23K 1120
Patent
active
057837945
ABSTRACT:
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.
REFERENCES:
patent: 4495397 (1985-01-01), Opprecht et al.
patent: 4591687 (1986-05-01), Urech
patent: 5075531 (1991-12-01), Sofue et al.
patent: 5302797 (1994-04-01), Yasuyama et al.
Welding International, vol. 7, No. 10, Jan. 1, 1993, pp. 820-827, XP 000397738, H. Oikawa, et al., "New Resistance Welding Techniques for Steel and Aluminum", p. 823, right col., line 9 -p. 826, left col., line 21.
Patent Abstracts of Japan, vol. 016, No. 299 (M-1274), Jul. 2, 1992 & JP-A-04 081288 (Kobe Steel Ltd), Mar. 13, 1992.
Matsuda Fuminori
Narita Kazuo
Oikawa Hatsuhiko
Okuda Yutaka
Saito Tohru
Nippon Steel Corporation
Pelham J.
Toyota Jidosha & Kabushiki Kaisha
Walberg Teresa J.
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