WELDING APPARATUS Russian patent published in 2001 - IPC

FIELD: welding equipment, namely apparatuses for welding by means of consumable electrode, possibly in different branches of industry. SUBSTANCE: welding circuit includes connected in series: power thyristor 3, smoothing choke 4, diode 5 and switching choke 6. Filtering capacitor 2 is connected in parallel to direct current source 1. Circuit of connected in series switching capacitor 11 and additional thyristor 7 is connected in parallel to switching choke 6. Circuit including connected in series switching capacitor 11, charging choke 8 and locking diode 9 is connected in parallel to direct current source 1. Part of turns of charging choke 8 and switching capacitor 11 are by-passed by means of additional diode 10 in opposite direction. Switching capacitor 11 is in the form of n capacitors connected in parallel and it has similar plates connected with negative terminal of direct current source 1 and opposite plates separated by means of chokes 2. Such apparatus allows to lower voltage and to use thyristors and switching capacitor of less voltage type. EFFECT: enhanced electrical safety of welding apparatus. 1 dwg