Electric arc welding system

An electric arc welding system for creating an AC welding arc between an electrode and a workpiece, said system comprising a first power supply to create a first AC current with first weld parameters between said electrode and workpiece by generating a first switch signal for reversing polarity of said first current at a specific time, a second power supply to create a second AC current with second weld parameters between said electrode and workpiece by a second switch signal for reversing polarity of said second current at a given time, a timing interface between said first and second power supplies to create said second signal by said first signal, and a circuit to switch said power supplies after said first and second signal, said circuit includes a detector to switch said power supplies when the current of said power supplies is less than a given amount.

An electric arc welding system for creating an AC welding arc between an electrode and a workpiece, said system comprising a first power supply to create a first AC current with first weld parameters between said electrode and workpiece by generating a first switch controlling signal reversing polarity of said first current at a specific active switch time, a second power supply to create a second AC current with second weld parameters between said electrode and workpiece by a second switch controlling signal reversing polarity of said second current at a switch activate time, and a timing interface between said first and second power supplies to create said second signal by said first signal where said first and second signals are within about 10 μs.

An electric welder comprising a first power source with a first output polarity changing switch network creating a first AC output with first output leads connected across an electrode and a workpiece and a second power source with a second output polarity changing switch network creating a second AC output with second output leads connected across said electrode and workpiece in parallel with said first leads whereby the current from said power sources is added.

In an electric arc welding system for creating a first waveform across a first gap between an first electrode and a workpiece and a second waveform across a second gap between a second electrode and said workpiece while said electrodes are moved relative to said workpiece, the improvement comprising:

• two power sources for creating at least one of said waveforms, said at least one waveform created by a number of current pulses occurring at a frequency of at least 18 kHz with a magnitude of each pulse controlled by a wave shaper and a circuit synchronizing said first and second waveforms.

An apparatus to arc weld two spaced ends of a workpiece which defines a gap by melting an advancing welding wire and depositing said melted wire into said gap to at least partially join said two spaced ends, said apparatus comprising a primary arc welder having at least one power supply that supplies welding current to said welding wire, said power supply including a pulse width modulator that at least partially controls said welding current to said welding wire and a waveform generator that at least partially controls said pulse width modulator, said power supply creating a series of current pulses that constitute a welding cycle representative of a current waveform wherein each current pulse has a given electrical polarity with respect to said workpiece, said pulse width modulator controlling a current pulse width of a plurality of said current pulses.