PURPOSE: To perform welding of high workability and high welding quality, by controlling a titled method so that an output in base period of pulse current becomes constant-voltage characteristics and an output in peak period of pulse current becomes constant-current characteristics, respectively.
CONSTITUTION: A peak signal generating circuit 13 compares a current value determined by a peak current setting device 14 and a current value measured by a current measuring device 8 and extracted by a peak current detector 12, and generates a peak signal so as to allow the two to coincide with each other. A base signal generating circuit 16 compares a voltage value determined by a base voltage setting device 15 and a voltage value extracted by a base voltage detector 17 by measurement of output voltage and generates a base signal to make the two coincide with each other. By the above way, the output in base period becomes constant-voltage characteristics and that in peak period becomes constant-current characteristics.
SHIMIZU GIICHIROU
YOSHINAGA CHIKARA
