Series connected electrode type welding machine and welding method using two electrodes

Application Number: 00109259
Application Date: 2000.06.21
Publication Number: 1277900
Publication Date: 2000.12.27
Priority Information: 1999/6/21 US 09/336804
International: B23K9/00;B23K9/02;B23K9/09;B23K9/12;B23K9/173;H02M3/28;H02M5/45;H02M7/515
Applicant(s) Name: Lincoln Global Inc.
Inventor(s) Name: Eliott K. Steva;Stephen R. Peters
Patent Agency Code: 11243
Patent Agent: gao jifu
Abstract An electric arc welding apparatus comprising at least a first consumable electrode and a second consumable electrode, a first power supply and a second power supply, where each of the power supplies includes a three phase voltage input operated at line frequency, a rectifier to convert the input voltage to a DC voltage link and a high frequency switching type inverter converting the DC voltage link to a high frequency AC current, an output rectifier circuit to provide a positive voltage terminal and a negative voltage terminal, and an output switching network operated at a given low frequency for directing a pulsating welding current at the given low frequency from the two terminals across one of the electrodes and the plates, and a circuit for independently adjusting the given low frequency.