Patent ID: 7339134

Claim:
An electric arc welding apparatus comprising: a welding station; a battery for providing a DC battery voltage; and a high switching speed converter coupled to said battery for converting said DC battery voltage to a signal conditioned for welding, wherein said high switching speed converter includes a pulse width modulator that at least partially controls said signal conditioned for welding to a welding electrode and a waveform generator that at least partially controls said pulse width modulator, said high switching speed converter creating a series of current pulses that constitute a welding cycle representative of a current waveform, said pulse width modulator controlling a current pulse width of a plurality of said current pulses, wherein said welding station, said battery and said high switching speed converter are movable on a wheeled carriage, and said battery comprises a 48 volt battery pack and provides DC voltage to said high switching speed converter and to said wheeled carriage.