Gas shielding requirements for arc welding
from AWS Welding Digest
Shielding gases may be introduced by a flux-coated rod or flux-cored wire feed, as is the case with shielded metal arc welding (SMAW) and self-shielded flux cored arc welding (FCAW-S). In other welding processes, including gas metal arc welding (GMAW), gas tungsten arc welding (GTAW) and gas-shielded flux cored arc welding (FCAW-G), an external shielding gas must be introduced.
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