Electric arc welder

An electric arc welder for depositing weld metal along a groove between two edges of a metal workpiece, said welder comprising:

• a first electrode driven by a first wire feeder at a first wire feed speed toward a point in said groove;
• a second electrode driven by a second wire feeder at a second wire feed speed toward said point, said first and second wire feed speeds being separately controlled;
• a main power source with a first output terminal connected to said first electrode and a second output terminal connected to said second electrode to create a series electrode path, said power source including a high speed switching output stage for creating current with a selected waveform between said first and second output terminals, said waveform of said main power source generated by a waveform generator controlling a pulse width modulator circuit to determine the current operation of said main power source;
• and a device for moving said electrodes in unison along said groove in a given direction.

An electric arc welder for depositing weld metal along a groove between two edges of a metal workpiece, said welder comprising:

• a first electrode driven at a first wire feed speed by a first wire feeder toward a point in said groove;
• a second electrode driven at a second wire feed speed by a second wire feeder toward said point;
• a first power source with an output terminal connected to said first electrode;
• and a second power source with an output terminal connected to said second electrode, said electrodes and power sources being connected to form a series circuit path with said power sources providing current in said series circuit path for depositing weld metal along said workpiece groove, said first wire feeder being driven by one of said power sources to control said first wire feed speed, and said second wire feeder being driven by the other of said power sources to control said second wire feed speed.