Cold metal transfer gas metal arc welding apparatus and method of operation

摘要

A cold metal transfer (CMT) contact tip (32) has a substantially copper-free contact surface (74) defining a wire passage (68). The CMT contact tip is used with a CMT welding apparatus having a weld wire and a wire feeder for feeding and oscillating the weld wire forward and backward through the wire passage where the weld wire shares a concentric axis with the wire passage.