| 摘要 |
PROBLEM TO BE SOLVED: To obtain a proper welding quality by welding a welding object based on a noise portion eliminated electric voltage between the welding electrodes. SOLUTION: In an inverter type resistance welding device 1, when a voltage between welding electrodes 9, 10 is detected by a voltage detection means, a high frequency portion of this voltage is cut off by an analog filter 15, and a ripple portion of said voltage is cut off by a digital filter 16. Thereby, an inverter control circuit 5 controls a transistor bridge circuit 4 based on a noise portion eliminated electric voltage between the welding electrodes.
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