AN ELECTRIC WELDING DEVICE

摘要

The electric arc welder prevents degrading welding quality by supplying a constant voltage to the welding electrode. The electric arc welder comprises (A) a power supply transformer to supply transformed AC power voltage to the welding electrode; (B) a variable impedance modulator to vary the current of power voltage; (C) a current detector to detect the current of power voltage supplying to the welding electrode; and (D) an impedance controller to control the impedance of the variable impedance modulator based on the detected current.