Control device for resistance welder

Details Control device for resistance welder Control device for resistance welder

1999-03-29

2000-09-12

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219109, B23K 1124

Patent

active

061180955

ABSTRACT:
In a resistance spot welder in which an operation of pressurizing an electrode is conducted by an electric servo motor, an amount of thermal expansion due to production of a weld nugget is detected every moment by reading an encoder which is incorporated in the servo motor. When the detected amount of thermal expansion reaches a preset reference value, it is judged that the weld nugget attains a predetermined strength, thereby stopping a current supply. According to this configuration, a predetermined amount of input heat is ensured, so that an excellent welding quality is surely obtained.

REFERENCES:
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patent: 3404252 (1968-10-01), Michael
patent: 3569659 (1971-03-01), Benton et al.
patent: 3585347 (1971-06-01), Needham et al.
patent: 3708648 (1973-01-01), Croucher et al.
patent: 4005307 (1977-01-01), Tamura et al.
patent: 5194709 (1993-03-01), Ichikawa et al.
patent: 5340960 (1994-08-01), Takasaki et al.
patent: 5510593 (1996-04-01), Sakai
patent: 5558785 (1996-09-01), Killian et al.

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