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Gases for Flux Core Arc Welding (FCAW)

  • 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.
      

  • 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.
      

  • 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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