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Multiport nozzle. A constricting nozzle of the plasma arc torch containing two or more orifices locat-ed in a configuration to achieve some control over the arc shape. See Mig welding. N Narrow groove welding. A variation of a welding process using multiple-pass welding with filler met-al. The use of a small root opening, with either a square groove or a V-groove and a small groove angle, yields a weld with a high ratio of depth to width. Neutral flame. An oxyfuel gas flame that is neither oxidizing nor reducing. See carburizing flame, oxidizing flame, and reducing flame. Neutral flux. A flux formulated to produce a weld metal composi-tion that is not dependent on the welding parameters, especially arc voltage (submerged arc welding). See active flux and alloy flux. Non-butting member. A joint member free to move in any direction perpendicular to its thickness dimension. For example, both members of a lap joint, or one member of a T-joint and corner joint. Non-consumable electrode. An electrode without filler metal. See TIG Welding (GTAW).