Production Engineering (Manufacturing) Joining Welding

What is the function of shielding gas in Gas Tungsten Arc Welding (GTAW)?

1
Protects the consumable coated electrode and the molten metal weld pool from the atmospheric contamination
2
Protects the tungsten electrode and the molten metal weld pool from the atmospheric contamination
3
Removes the slag by striking and conducts current to pass through it
4
Protects the consumable bare electrode and the molten metal weld pool from the atmospheric contamination

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