| 主权项 |
1. A welding system, said system comprising:
a first power supply that outputs a first welding current during a first mode of operation and a first heating current during a second mode of operation, said first power supply providing said first welding current or said first heating via a first contact tube to a first wire; a first wire feeder that feeds said first wire to said first contact tube; a second wire feeder that feeds a second wire to a second contact tube; a second power supply that outputs a second heating current during said first mode of operation and a second welding current during said second mode of operation, said second power supply providing said second heating current or said second welding current to said second wire via said second contact tube; a travel mechanism that provides a relative movement between a workpiece and said first wire and said second wire such that, during said movement in a first direction, said first wire leads said second wire relative to said workpiece, and, during said movement in a second direction, said first wire trails said second wire relative to said workpiece; and a controller that initiates said first mode of operation during said first direction and automatically switches to said second mode of operation when said travel mechanism switches from said first direction to said second direction, wherein, during said first mode of operation, said first welding current creates an arc between said first wire and said workpiece and said second wire is heated by said second heating current to a desired first temperature, and wherein, during said second mode of operation, said second welding current creates an arc between said second wire and said workpiece and said first wire is heated by said first heating current to a desired second temperature. |
