Oblon, McClelland, Maier & Neustadt, L.L.P.
Arc welding apparatus, constant voltage characteristic welding power source, and method for performing arc welding
An arc welding apparatus includes a lifting motor. A speed adjustment circuit controls the lifting motor such that the rising speed of the welder decreases if a current of the welding power source is smaller than a set value, or increases if the value of the current is larger than the set value. A voltage adjustment circuit controls the welding power source such that the voltage increases if the number of times that the voltage falls below a determination voltage is larger than a set number of times or if periods for which the voltage remains below the determination voltage are longer than a set time, or decreases if the number of times that the voltage falls below a determination voltage is smaller than a set number of times or if periods for which the voltage remains below the determination voltage is shorter than a set time.
Kobe Steel, Ltd.
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Reiichi Kei
Suzuki Yamazaki