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Gases
for Flux Core Arc Welding (FCAW)
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Carbon
Dioxide. The
majority of flat-position large-diameter (> 1/16")
flux-cored wires that use a secondary shielding gas use carbon
dioxide. The arcs are generally quiet with high deposition rates
and are good for welding over rust and mill scale on heavy plate.
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Argon-Carbon
Dioxide Mixtures. Most
of the small-diameter (< 1/16") and all position cored
wires use an argon-based shielding gas. These gas blends provide
greater weld puddle control lower welding fume and are preferred
by welders because of ease of use.
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Argon-Oxygen
Mixtures. Small
amounts of oxygen may be added to argon for welding carbon steels;
however, shielding gas blends, such as argon-2% oxygen, are used
primarily for Gas Metal Arc Welding (GMAW) of stainless steels.
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