20100243615 | WELDING APPARATUS AND METHODS - A welding apparatus comprises a first electrode; a second electrode opposite the first electrode, the second electrode being movable toward and away from the first electrode; a third electrode; a fourth electrode opposite the third electrode, the fourth electrode being movable toward and away from the third electrode; a first transformer winding adapted to be coupled to a power source; a second transformer winding electromagnetically coupled to the first transformer winding and the first and second electrodes; and a third transformer winding electromagnetically coupled to the first transformer winding and the third and fourth electrodes; the first transformer winding substantially evenly transferring current to the second transformer winding and the third transformer winding when energized by the power source, such that the first and second electrodes are energized substantially simultaneously with the third and fourth electrodes. | 09-30-2010 |