CONTACT TIP FOR ARC WELDING

摘要

A contact tip for arc welding includes a feed surface constructed of conductive material which has a negative thermoelectromotive force with respect to pure platinum at temperatures above 0 DEG C. When welding current flows from the contact tip to a welding wire, an endothermic reaction occurs at the feed surface to lower the temperature of the feed surface and to improve the thermal durability of the contact tip.