WHAT GAS TO USE WITH FLUX CORE WIRE

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Regarding your second question about the American Welding Society (AWS) classification of Innershield® NR-212 (E71TG-G), I can see where that would lead to some confusion.  While the "G" in FCAW-G stands for gas shielded (or the &#;S&#; in FCAW-S for self-shielded), the "G" in a specific electrode AWS classification stands for &#;general&#;.  Therefore, an E71TG-G classification does not mean that it is a gas-shielded electrode.  Typically, a U.S. welding electrode manufacturer (such as Lincoln Electric, etc.) designs an electrode to meet the requirements of a specific, predefined AWS electrode classification, per the appropriate AWS Filler Metal Specification (such as E71T-1, E71T-8, E, ER70S-6, etc.).  However, a manufacturer is still free to make a particular electrode that does not meet any predefined AWS classification.  In these cases, it is classified as "general".  Such is the case with Innershield® NR-212, in which the first "G" in the electrode&#;s AWS number means it has a general usability classification.  Innershield® NR-212 also happens to be a low-alloy electrode (i.e. under AWS A5.29 Filler Metal Specification).  These electrodes have alloy designations in their suffix (i.e. E71T8-K6, E81T1-K2, E81T1-Ni1, etc.).  In the case of Innershield® NR-212, the second &#;G&#; is a general alloy suffix classification.  Therefore, E71TG-G is its classification. 

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