| 摘要 |
This application discloses an electric arc welding system using two welding wires fed through a single torch, with means for driving either wire in either direction. The torch, or torch tip, has a wire passage which, at the extremity of the tip, will pass only one of the two wires. The two wires are threaded through the torch side-by-side, and with one in a retracted position, the other can be fed from the torch. Thus, assuming two wires of different characteristics, a change over from one to the other can be quickly made.
|
