Patent ID: 6956185
Filing Date: 2005-10-18
Classification: B23K

Abstract:
1. An apparatus for electric arc welding two spaced ends at a groove between said two spaced ends by melting an advancing welding wire d depositing said melted wire into said groove to join said spaced ends, said apparatus comprising power supply to create a series of small width current pulses constituting a welding cycle, said current pulses in said cycle each having a given electrical polarity of said advancing wire with respect to said two spaced ends; and, a selector to select the polarity of said current pulses in said cycle between a first polarity with said wire being positive and a second polarity with said wire being negative, said power supply including an inductor, a first switch to connect said inductor between said wire and said spaced ends, a second switch to connect said inductor between said wire and said spaced ends and said selector including a switch control to close either said first switch or said second switch during a given weld cycle.