WELDING AGGREGATE

FIELD: power source for electric arc welding, possibly in different branches of machine engineering. SUBSTANCE: welding aggregate according to first variant of invention includes capacitor of -shaped LC-filter, diodes, tuning resistor, additional increased-voltage electric current source, Zener diode and outlet diode. Circuit of connected in series choke and capacitor of -shaped LC-filter is connected in parallel with outlet terminals of power rectifier and it is connected by means of capacitor to additional current source with increased voltage in the form of thyristorised semibridge circuit. Control electrodes are connected with cathodes of diodes connected through tuning resistor with anode of Zener diode whose cathode is connected with mean tap of secondary winding of controlled transformer and with cathode of outlet diode whose anode is connected with negative outlet terminal of power rectifier. In second variant of invention circuit of connected in series choke and capacitor of -shaped LC-filter is connected in parallel with outlet terminals of power rectifier and it is connected through capacitor to additional current source with increased voltage. Diagonal of diode bridge of additional current source is connected with primary winding of controlled transformer through capacitive divider of mains voltage. Mean tap of secondary winding of controlled transformer through switch of operational modes is connected to positive outlet terminal of power rectifier; said terminal is connected with cathodes of diodes of bridge type power rectifier. In welding aggregate according to third variant of invention circuit of choke and capacitor of -shaped LC-filter is connected in parallel with outlet terminals of power rectifier. Mean points of each pair of diodes of voltage multiplier through accumulation capacitors are connected with terminals of secondary winding of transformer, and mean tap of secondary winding of controlled transformer through switch of operational modes is connected to positive outlet terminal of power rectifier. Said terminal through above mentioned switch is connected to cathodes of diodes of power rectifier. EFFECT: improved design of welding aggregate providing lowered consumption of electric current of AC mains during welding, enhanced condition of igniting and stabilization of electric arc. 4 cl, 4 dwg