PROCESS OF INITIATION OF ELECTRIC ARC AND DEVICE FOR ITS REALIZATION Russian patent published in 2000 - IPC

FIELD: electrical engineering, welding. SUBSTANCE: forcing voltage of same polarity but greater amplitude is fed after opening of short-circuiting jumper to power supply source to maintain normal process of initiation of electric arc and welding of contaminated or oxidized metal ( steel or aluminum ). After this voltage pulse of polarity opposite with regard to power supply source of electric arc but exceeding in nominal value above-mentioned forcing voltage and having shortened front is fed to arc gap with time delay. Device for initiation of electric arc is inserted with source of internal forcing voltage, blocking choke and element " long line ". In addition source of pulses of excitation voltage and magnetic keys with procedure of control over them were updated. EFFECT: maintenance of normal process of initiation of electric arc and welding. 10 cl, 17 dwg