Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1988-11-07
1989-12-26
Lechert, Jr., Stephen J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
428553, 428564, 427 58, 427 59, 427 60, 2191171, 219119, 106 123, 106 126, 106 129, 106 127, B22F 300
Patent
active
048897736
ABSTRACT:
A coating for improved resistance welding of galvanized steel parts or sheets comprises a binder, and a metal phosphide pigment, preferably a ferrophosphorus pigment, having a particle size of from about 0.1 to about 30 microns. The pigment can also include up to about 40% by weight of an additional metal such as tin, aluminum or lead, which can be combined with the metal phosphide in pigment form or deposited onto the surface of the particles. The coating can be applied to either the faying or non-faying surfaces of the galvanized steel, or to the resistance welding electrode, and may be removed, if desired, after the welding operation.
The advantages of the present invention include a significant reduction in welding current and an increase in the weldability lobe width, a restoration of the dynamic resistance beta peak, and an increase in electrode life.
REFERENCES:
patent: 3102190 (1963-08-01), Chapleur
patent: 3519783 (1970-07-01), Forsberg
patent: 3665145 (1972-05-01), Engel
patent: 3884705 (1975-05-01), Blair
patent: 4044220 (1977-08-01), Glagola
Honjo et al., "International Journal of Materials and Product Technology", vol. 1, No. 1, pp. 83-114, 1986.
Campbell Donald H.
Evarts Gerald L.
Fuerle Richard D.
Lechert Jr. Stephen J.
Mai Ngoclan
Mudd James F.
Occidental Chemical Corporation
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