| 摘要 |
PURPOSE:To increase the welding quality by setting the pulse width by the sequence circuit signal and by controlling the current waveform of driving circuit and the frequency in the inverter circuit having the power rectifying, smoothing and power inverting circuits for a resistance welding machine. CONSTITUTION:The waveform of the welding current of a sequence circuit 9 is set 11 by the ON, OFF of the welding current, the pressure and release of a welding gun 7, etc. for the detecting current 14 of the inverter circuit 1 having a power rectifying circuit 2, smoothing circuit 3 and power inverting circuit 4 and driven by a modulating pulse width 13 by controlling 12 the frequency thereof, The welding current is therefore controlled freely in the waveform corresponding to the welding purpose and the welding quality is increased.
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