Lubricated aluminum weld wire and process for spooling it

Details Lubricated aluminum weld wire and process for spooling it Lubricated aluminum weld wire and process for spooling it

1988-07-20

1990-04-03

Morgenstern, Norman

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427 59, 427156, 72 41, 72 42, 2191372, 21914622, 428375, 428377, 428380, 242 78, C05B 1116, B65B 3300, B23K 928, B23K 3534

Patent

active

049139274

ABSTRACT:
Aluminum weld wire having a nascent aluminum surface, (the weld wire is also useful for vacuum and arc metallizing), is lubricated with a dual coating of an essentially anhydrous lower alkanol and a colloidal solid lubricant each present as a layer so thin that they are essentially invisible to the naked eye. The solid lubricant is oil-free colloidal graphite which may be combined with a minor amount of a sulfide of molybdenum. The lubricant particles are deposited from a 1% to 15% by wt dispersion of the particles in the alkanol, in substantially spaced-apart relation, forming a non-uniform, monoparticulate layer on the nascent aluminum surface. The high propensity of the lubricant particles to settle out (they are smaller than 10 microns, and generally smaller than 1 micron in size) from the dispersion, permits formation of the monoparticulate layer. The alkanol layer is so thin that only from 100 ppm to 0.1% of alkanol, by weight of the weld wire, is present. Despite such minimal presence of each layer, the lubricity provided by the dual-coated weld wire is sufficient to level-layer spool the wire mechanically, substantially without human intervention. Because of such minimal presence, neither lubricant layer interferes with the welding process. When the dual-coated weld wire is spooled and sealed in a confined atmosphere provided by a hermetically sealed spool, the alkanol provides protection against oxidation of the nascent aluminum surface; and, despite being a hydrogen-containing material, the alkanol does not interfere with the high quality of the weld produced with the weld wire. Processes for using the weld wire are also disclosed.

REFERENCES:
patent: 2157155 (1939-05-01), Work et al.
patent: 2500380 (1950-03-01), Rochat
patent: 3348979 (1967-10-01), Murphy et al.
patent: 3391033 (1968-07-01), Chevigny et al.
patent: 3676309 (1972-07-01), Dolomont
patent: 3791860 (1974-02-01), Zelley et al.
patent: 3895971 (1975-07-01), Bushey et al.
patent: 4233349 (1980-11-01), Niederhauser
patent: 4674672 (1987-06-01), Anderson

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