POWER SOURCE OF DIRECT-CURRENT WELDING ARC Russian patent published in 1994 - IPC

FIELD: welding technology. SUBSTANCE: source has input rectifying unit, power voltage converter consisting of semiconductor keys and power transformer, output rectifier and choke coil, control unit with control transformer, limiting choke coil, current transformer and liminal device. EFFECT: enhanced quality of weld, enhanced source efficiency and reliability resulting in proportional increase of the welding current in case of parallel connection and in using both three-phase and one-phase networks for the power source. 3 cl, 1 dwg