PURPOSE: To control an inverted current waveform with high accuracy by using two DC power sources, superposing a current waveform by opening and closing a transistor switch connected to currents of plus and minus, by a chopper system, and welding by use of this waveform.
CONSTITUTION: A DC power source uses two power sources 1, 1' of maximum 500A, which are capable of obtaining a drooping characteristic, (a) and (n) of the power source 1 for supplying an SP current are connected to a plus pole and a minus pole, respectively, and also (j) and (k) of the power source 1' for supplying an RP current are connected to the plus pole and the minus pole, respectively. Subsequently, as to the frequency inputted to transistor switches 2, 3, 4 and 5 in an output controlling circuit 8, 10KH2 corresponding to TSP1 and TRP1 is given to 2 and 4, a high-frequency pulse of 25W100Hz corresponding to TSP2 and TRP2 is given to 3 and 5, and by opening and closing both of them, a current waveform is superposed by a chopper system. Welding is executed by this waveform.
SATOU AKIRA
OGURA SATOSHI
KUSHIDA MITSUSACHI
