Electric heating – Metal heating – For bonding with pressure
Reexamination Certificate
2005-03-01
2005-03-01
Dunn, Tom (Department: 1725)
Electric heating
Metal heating
For bonding with pressure
C219S119000
Reexamination Certificate
active
06861609
ABSTRACT:
A design of copper welding electrode is disclosed. The electrode can be used in successive spot welding operations on assembled aluminum alloy sheet parts of widely varying thicknesses, e.g., from 0.9 to 4+mm. The electrode has a round body terminating in a truncated cone with a crowned face. The face has a diameter of about eleven millimeters up to the diameter of the body and the radius of the crowned face is about twenty to thirty millimeters. The dimensions and shape of the electrode provide robust welding performances despite varying part thicknesses and off angle electrode positioning, and the textured surface provides good electrical contact.
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patent: 5961853 (1999-10-01), Thornton
patent: 6403913 (2002-06-01), Spinella et al.
William R. Oates, Risistance Welding, Welding Handbook, pp. 72-79, vol. 3, American Welding Society, Miami, Florida.
Table 7, Guidelines to Resistance Spot Welding Aluminium Sheet, Guidelines to resistance spot welding alumnim automotive sheet, p. 13, the Aluminum Association Incorporated, Washington, DC.
Edward P. Patrick, Donald J. Spinella, The Effects of Surface Characteristics on the Resistance Spot Weldability of Aluminum Sheet, Sheet Metal Welding Conference VII, Oct. 9-11, 1996, American WElding Society, Detroit Section.
Dunn Tom
Marra Kathryn A.
Tran Len
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