| 摘要 |
<p>A method and apparatus for feeding wire (209) in a welding system include one or more motors (301,302) disposed adjacent the wire (209) to drive it. A wire feed motor is also disposed along the wire path, and is closer to the source of wire than the torch (108), and closer to the source than the one or more motors (301,302). The motors (301,302) may be a pair of motors disposed on opposite sides of the wire (209) and move the wire (209) to and away from an arc end of a torch (108). They preferably reverse the direction of the wire (209) within one process cycle. The motors may be stepper motors, servo motors, zero backlash motors, gearless motors, planetary drive motors, or linear actuators (such as a piston). <IMAGE></p> |
