FIELD: electric arc welding of metals by means of melting electrode, namely apparatuses for electric arc AC-welding.
SUBSTANCE: apparatus includes power transformer, full-wave switch, two-winding pulse transformer, capacitors, control unit, resistors and thyristors connected mutually in opposite and having cut-off diodes. Primary winding of power transformer is connected with terminals of supply mans through full-wave switch. Secondary winding of said transformer is connected with load. Thyristors with cut-off diodes are connected to terminals of supply mains through resistor shunting primary winding of two-winding pulse transformer. Capacitors are connected between connection nodes of thyristors with diodes and supply mains terminals. Secondary windings of power and two-winding pulse transformers are connected mutually in parallel.
EFFECT: enhanced reliability of driving of electric arc, stable electric arc burning, reduced outlet current, lowered mass of active materials.
2 dwg
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