Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1987-06-08
1988-12-27
Terapane, John F.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
B22F 704
Patent
active
047940506
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: 4337299 (1982-06-01), Van den Bergh
patent: 4350539 (1982-09-01), Torok et al.
patent: 4497876 (1985-02-01), Kidon
patent: 4524111 (1985-06-01), Oka et al.
patent: 4601957 (1986-07-01), Fujimoto et al.
patent: 4707415 (1987-11-01), Ikeda et al.
Honjo et al., "International Journal of Materials and Product Technology" vol. 1 No. 1 pp. 83-114 1986.
Campbell Donald H.
Evarts Gerald L.
Gosz William G.
Jorgensen Eric
Occidental Chemical Corporation
Tao James F.
Terapane John F.
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