Electric heating – Metal heating – For bonding with pressure
Patent
1975-01-13
1976-08-31
Reynolds, Bruce A.
Electric heating
Metal heating
For bonding with pressure
219 92, B23K 1110
Patent
active
039783081
ABSTRACT:
A pneumatically operated welding machine particularly useful for welding small diameter wires onto pins for electronic circuitry is described. In such welding an insulated wire is fed through a hollow upper electrode for welding between the electrode and a pin. Equal pressures applied by the upper and lower electrodes first exert sufficient force for penetrating the plastic insulation and thereafter the force is reduced to an optimum level for welding. The upper and lower electrodes are connected to double acting pneumatic cylinders connected to a pneumatic circuit that sequentially brings the electrodes into light contact with the workpiece for lateral positioning, applies sufficient breakthrough force to penetrate the plastic insulation, applies a reduced force during a welding period and finally retracts the electrodes. Such light weight, low inertia, low friction, pneumatic electrode actuation provides balanced force between the electrodes and sufficient compliance that excellent welds are uniformly obtained irrespective of pin length or position.
REFERENCES:
patent: 2413783 (1947-01-01), Purat
patent: 2859330 (1958-11-01), White
patent: 2967228 (1961-01-01), Tindall
patent: 3660631 (1972-05-01), Conley
patent: 3705970 (1972-12-01), Weatherman et al.
Reynolds Bruce A.
Sterling Electronics Corporation
Tone David A.
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