Part of Course: Welding Technology Model

Unit Overview / Details

Gas-Metal-Arc Welding (GMAW) evolved from CAW when it was realized that a consumable electrode – eliminating any need for a welding rod, could replace the carbon electrode. To reduce oxidation, the electrode wire is coated with materials such as fluorides, oxides, carbonates, metal alloys, and binders to stabilize the arc, to produce gases to shield the weld from oxygen and atmospheric contaminants, and to introduce metal alloy to weld.  GMAW is used principally with nickel and ferrous base metals