Stud welding tool with retraction mechanism

Details Stud welding tool with retraction mechanism Stud welding tool with retraction mechanism

1975-06-30

1977-01-11

Truhe, J. V.

Electric heating

Metal heating

For bonding with pressure

219 99, B23K 920

Patent

active

040028763

ABSTRACT:
A welding tool is set forth for end welding studs to workpieces. The tool is primarily designed to end weld small studs having precisely-formed tips. The stud is held by a chuck connected to a chuck leg with an electrical coil holding the chuck leg in a retracted position prior to welding. When the coil is deenergized, a plunge spring plunges the chuck leg, the chuck, and the stud back toward the workpiece. With a high voltage imposed between the stud and the workpiece, the stud tip vaporizes when reaching the workpiece and adjacent portions of the stud and workpiece melt to securely weld the stud. To initially move the chuck and chuck leg to the retracted position, a retraction mechanism is provided. This includes a lever pivotally mounted at the front of the tool and engagable with a portion of the chuck leg to retract the chuck leg when the lever is manipulated by an operator. This reduces the retraction effort to increase the rate of welding and to reduce operator fatigue.

REFERENCES:
patent: 2474531 (1949-06-01), Keir et al.
patent: 2976608 (1961-03-01), Busler
patent: 3138693 (1964-06-01), Buehler et al.
patent: 3733457 (1973-05-01), Wieland
patent: 3774005 (1973-11-01), Spisak

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