Electric heating – Metal heating – For bonding with pressure
Patent
1992-08-26
1994-01-04
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
B23K 1124
Patent
active
052763080
ABSTRACT:
A resistance welding machine includes a circuit for detecting a timing when the time derivative of primary winding current of a welding transformer becomes almost zero. The machine includes a circuit for measuring the primary winding current and primary winding voltage of the welding transformer, when the timing is detected by the timing detecting circuits. There is also for calculating a resistance of a secondary circuit from the primary winding current and y winding voltage measured by the measuring circuit as well as a characteristic value of the welding transformer. The machine includes a circuit for calculating variation of the resistance of the secondary circuit calculated by the calculating circuit in a predetermined period of time, and a circuit for discriminating presence or absence of flash occurrence by comparing the value relating to the variation calculated by the variation calculating circuit with an intermediate value between a value relating to the variation when flash occurs and a value relating to the variation when no flash occurs. Additionally, the machine includes a welding current regulator for comparing the number of flash occurrence discriminated by the discriminating circuit with the number of flash occurrence at optimum welding, and decreasing the welding current if the former is larger than the latter, and increasing the welding current if the former is smaller than the latter.
REFERENCES:
patent: 3546421 (1970-12-01), Meyer et al.
patent: 4419560 (1983-12-01), Zurek
patent: 4694135 (1987-09-01), Nagel et al.
patent: 5083003 (1992-01-01), Clark, Jr. et al.
Nadex Co., Ltd.
Shaw Clifford C.
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