Apparatus for electrical resistance spot welding

Details Apparatus for electrical resistance spot welding Apparatus for electrical resistance spot welding

1994-01-12

1996-04-02

Walberg, Teresa J.

Electric heating

Metal heating

For bonding with pressure

219 911, 92 15, 92 28, B23K 1111, B23K 1136

Patent

active

055042970

ABSTRACT:
An improved welding apparatus and method of use including a pair of opposed electrodes mounted on arms which are fixed against outward displacement during the application of the welding current. One of the arms includes a pneumatic cylinder for moving an electrode to and away from the work piece. The cylinder includes a piston rod attached to a clutch by a ball screw mechanism. A brake assembly is connected to the unidirectional clutch to prevent outward displacement of the electrodes during expansion of a weld nugget and permitting inward movement of the electrodes to provide indentation of the weld after the nugget softens.

REFERENCES:
patent: 3889094 (1975-06-01), Needham
patent: 4861959 (1989-08-01), Cecil

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