FIELD: welding. SUBSTANCE: power supply source for electric arc welding has transformer which magnetic circuit is manufactured in the form of toroidal core with inner partition. Partition carries primary winding and main power supply winding of arc. First additional winding is put on one of toroidal parts of magnetic circuit. The other toroidal part of magnetic circuit carries second additional winding connected in opposition with main power supply winding of arc and boosting winding connected through change-over switch and sectionalized element to A. C. voltage. Section of inner partition is at least twice as big as that of toroidal parts of magnetic circuit. EFFECT: improved stability and reliability. 2 cl, 3 dwg
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