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Pieces of metal are welded together in an atmosphere of argon. Explain why an atmosphere of argon is used.
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Pieces of metal are welded together in an atmosphere of argon. Explain why an atmosphere of argon is used.

User JustH
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Argon is used to protect the weld from possible porosit,  Porosity is small divets and holes that weeken the weld being made.  
User Muuk
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