Inverter seam resistance welding electric power supply apparatus

Details Inverter seam resistance welding electric power supply apparatus Inverter seam resistance welding electric power supply apparatus

1996-09-19

1999-02-02

Mills, Gregory L.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

058668667

ABSTRACT:
In order to improve the quality of seam welding, an inverter seam resistance welding electric power supply apparatus reliably determines local weldability (conforming/defective) of seam welding by simply monitoring welding current. In a seam welding operation, when a current monitor time interval has elapsed, a CPU reads, from storage, measured obtained during the current monitor time interval and computes an average as an arithmetic mean method. Then the CPU compares the average current CPU determines the occurrence of a conforming local welding whereas it determines the occurrence of a defective local welding if the average current value goes out of the monitoring range. For successive determinations of defective local welding for a preselected number of times, for instance, three, the CPU determines that a defective seam welding has occurred, and takes appropriate action immediately, for instance, by stopping the seam welding operation.

REFERENCES:
patent: 4562330 (1985-12-01), Hamilton
patent: 4677272 (1987-06-01), Tajiri
patent: 4734556 (1988-03-01), Namiki
patent: 4734640 (1988-03-01), Kitahori et al.
patent: 4792656 (1988-12-01), Namiki et al.
patent: 4910375 (1990-03-01), Izume
patent: 5360959 (1994-11-01), Takano et al.
patent: 5406045 (1995-04-01), Kiriishi et al.

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