Controlled rectifier welding power source

Claim 1

A WELDING POWER SOURCE FOR PROVIDING AN ALTERNATING SQUARE WAVE CURRENT FOR ARC WELDING COMPRISING, A FIRST DIRECT CURRENT TRANSFORMER RECTIFIER UNIT HAVING CONTROL MEANS FOR ADJUSTING THE VOLTAGE AND AMPERAGE OUTPUT THEREOF, A SECOND DIRECT CURRENT TRANSFORMER RECTIFIER UNIT CONNECTED IN CIRCUIT WITH THE FIRST TRANSFORMER RECTIFIER UNIT, SAID FIRST AND SECOND TRANSFORMER RECTIFIER UNITS BEING ELECTRICALLY CONNECTED IN THE CIRCUIT AT OPPOSITE POLARITIES, AN ELECTRONIC CONTROL CIRCUIT FOR TRIGGERING SAID FIRST AND SECOND TRANSFORMER RECTIFIER UNITS ALTERNATELY FROM FULLOFF TO FULL-ON CONDUCTING, PROGRAM MEANS CONNECTED TO SAID ELECTRONIC CONTROL CIRCUIT FOR VARYING THE DURATION OF EACH OPPOSITE POLARITY FULL-ON CONDUCTING PERIOD OF SAID FIRST AND SECOND TRANSFORMER RECTIFIER UNITS, AND A PLURALITY OF CONTROLLED RECTIFIER UNITS INCLUDED IN SAID ELECTRONIC CONTROL CIRCUIT TO ESTABLISH THE OPPOSITE POLARITY CONDUCTING PERIODS FO THE FIRST AND SECOND TRANSFORMER RECTIFIER UNITS, SAID CONTROLLED RECTIFIER UNITS BEING OPERATIVELY CONNECTED TO SAID CONTROL CIRCUIT SO THAT A PREPROGRAMMED SEQUENCE OF POWER PULSES ARE SUPPLIED TO THE ARC, SUCCESSIVE PULSES IN SAID SEQUENCE BEING OF DISTINCT DURATION, VOLTAGE, AND AMPERAGE INDEPENDENT OF ANY OTHER PULSE IN THE SEQUENCE, AND DETERMINED SOLELY BY THE PROGRAM.