Which shielding gas is usually used when welding aluminum?

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Multiple Choice

Which shielding gas is usually used when welding aluminum?

Explanation:
Aluminum welds need a shielding gas that stays inert and protects the molten metal from reacting with air. Argon is used because it provides a nonreactive blanket that stabilizes the arc and keeps the weld pool clean, giving good weld quality. Other gases would cause problems: oxygen would form oxide inclusions, carbon dioxide would oxidize the weld, and nitrogen can form brittle nitrides, all leading to weaker or defective welds.

Aluminum welds need a shielding gas that stays inert and protects the molten metal from reacting with air. Argon is used because it provides a nonreactive blanket that stabilizes the arc and keeps the weld pool clean, giving good weld quality. Other gases would cause problems: oxygen would form oxide inclusions, carbon dioxide would oxidize the weld, and nitrogen can form brittle nitrides, all leading to weaker or defective welds.

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