Welders use helium (He) and argon (Ar) gases to blow over the metal during the welding process. Why would they want to use these gases?
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The inert or semi-inert gases used in gas metal arc welding and gas tungsten arc welding (GMAW/GTAW or MIG/TIG) protect the weld area from atmospheric gases. Gases in the atmosphere include oxygen, nitrogen, carbon dioxide, and water vapor. ... Of those only helium and argon are cost effective enough to be used in welding
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