Patent ID: 7842903
Filing Date: 2010-11-30
Classification: B23K

Abstract:
1. A welding system for performing a short arc welding process between an advancing wire electrode and a workpiece where said electrode has an end facing said workpiece, said system comprising: a power source with a controller for creating a current pulse introducing energy into said end of said electrode to melt said end and a low current quiescent metal transfer section following the end of said current pulse during which said melted electrode short circuits against said workpiece, wherein said controller includes a circuit for creating a short circuit clearing pulse after said short circuit prior to a next current pulse, said clearing pulse has a first current followed by a higher second current, the current is constant for a period of time between the first current and the second current, a timer for measuring an actual time between the end of said current pulse and the beginning of said short circuit; a device for setting a desired time from the end of said current pulse to the beginning of said short circuit; a circuit for creating a corrective signal based upon a difference between said actual time and said desired time; and a circuit responsive to said corrective signal for controlling a given parameter of said current pulse.