Argon is a inert gas which is actually a heavy gas aswell meaning that it basically does nothing, unlike oxygen which is an oxidizer that will cause reactions to materials and objects over time.
So argon is very good and protecting objects from oxidation because it’s also heavier, pushing oxygen away.
Argon is also used in welding due to these properties because it protects the molten metal from oxidation during the welding process.
So very basic answer, hope this helps
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