WELDING UNIT Russian patent published in 2015 - IPC B23K9/09 B23K9/73 

FIELD: metallurgy.

SUBSTANCE: unit consists of power source 1, to the positive pole of which there connected is switching choke 2 and power thyristor 3, which are shunted with in-series connected blocking diode 4 and resistor 5, armature of filtering capacitor 6 is connected to a connection point of cathode of diode 4 and resistor 5, and its second armature is connected to the negative side of power source 1, as well as choke 8, which is connected to a welding circuit. Parallel to switching choke 2 there connected are in-series connected auxiliary thyristor 14 and switching capacitor 10 connected in parallel with a circuit of charging choke 11 and diode 12. Charging thyristor 13 is connected between the connection point of charging choke 11 with diode 12 and the minus output of the power source.

EFFECT: no failures in pause current and high arcing stability; reduction of rated current of blocking diode to the pause current value, which improves energy properties of the unit.

1 dwg