Constant-feed consumable-electrode arc-welding apparatus

Claim 1

APPARATUS FOR ARC WELDING WORK WITH A CONSUMABLE ELECTRODE COMPRISING A MOTOR CONNECTED TO SAID ELECTRODE FOR ADVANCING SAID ELECTRODE INTO ARC WELDING RELATIONSHIP WITH THE WORK, A SILICON-CONTROLLED RECTIFIER HAVING AN ANODE, A CATHODE AND A GATE, POWER-SUPPLY CONDUCTORS FOR SUPPLYING ALTERNATING CURRENT, MEANS CONNECTING SAID CONDUCTORS, AND SAID ANODE AND CATHODE IN POWER SUPPLY RELATIONSHIP WITH SAID MOTOR, MEANS RESPONSIVE TO THE LOADING IMPOSED BY SAID ELECTRODE ON SAID MOTOR FOR DERIVING A DIRECT-CURRENT POTENTIAL DEPENDENT ON THE MAGNITUDE OF SAID LOADING, A CAPACITOR, A SOURCE OF CONTROLLING ALTERNATING POTENTIAL, MEANS CONNECTING SAID SOURCE, SAID DERIVING MEANS AND SAID MOTOR IN CHARGING RELATIONSHIP WITH SAID CAPACITOR WITH THE BACK ELECTROMOTIVE FORCE OF SAID MOTOR OPPOSING SAID LOADING-DEPENDENT POTENTIAL SUPPLIED BY SAID DERIVING MEANS, A DISCHARGE CIRCUIT FOR SAID CAPACITOR INCLUDING A FOUR-LAYER DIODE, SAID CAPACITOR DISCHARGING THROUGH SAID FOUR-LAYER DIODE WHEN ITS POTENTIAL REACHES A PREDETERMINED MAGNITUDE AND WHEN SO DISCHARGING PRODUCING POTENTIAL PULSES, AND MEANS CONNECTED TO SAID GATE FOR IMPRESSING SAID PULSES THEREON TO RENDER SAID RECTIFIER CONDUCTING AT INSTANTS IN THE PERIODS OF THE ALTERNATING POTENTIAL IMPRESSED BY SAID POWER-SUPPLY CONDUCTORS DEPENDENT ON SAID LOADING.