Roller electrodes for electric-resistance welding machine

Details Roller electrodes for electric-resistance welding machine Roller electrodes for electric-resistance welding machine

1989-10-20

1992-02-18

Lateef, Marvin M.

Electric heating

Metal heating

For bonding with pressure

219 64, B23K 1106

Patent

active

050896822

ABSTRACT:
A roller electrode combination for use in electric-resistance welders, the electrode having relatively rotatable components separated by very small gaps, and an electrically and thermally conductive liquid is contained by the components across the gaps; the conductive liquid being a gallium dominant composite eutectic mixture where its phase change from liquid to solid begins at possibly 5-8 degrees C. Special controls are provided for the coolant for the roller electrodes, including a sensor to determining its temperature and a heater to preclude its flow through the roller electrode at temperatures below where such phase change might take place. The roller electrodes may be formed of alloys of copper (Cu) and/or a sintered mixture of copper (Cu) and tungsten (W). A protective coating between 0.0025 and 0.025 millimeters thick may be plated on surfaces of the composite copper (Cu) and tungsten (W) roller electrode that come in contact with the conductive liquid. The coating may be of gold and/or of the platinum family, such as rhodium (Rh) and iridium (Ir).

REFERENCES:
patent: 3363950 (1968-02-01), Levine et al.
patent: 4188923 (1980-02-01), Kawai et al.
patent: 4317704 (1982-03-01), McIntyre et al.
patent: 4368372 (1983-01-01), Habenicht et al.
patent: 4642437 (1987-02-01), Yamamoto et al.
patent: 4780589 (1988-10-01), Davies
patent: 4782207 (1988-11-01), Masuda et al.
Metal Publication (1955), Dr. H. Spengler.

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