What special considerations apply to TIG welding magnesium or titanium in terms of shielding gas, prep, and safety?

• A. Use air as shielding gas; no special prep
• B. Use helium as shielding gas; surfaces must be dry
• C. Use high-purity argon; clean surfaces; avoid moisture; manage heat and fire risk; PPE and ventilation; magnesium flame hazards
• D. Magnesium and titanium require water cooling and no shielding gas

Answer: (C)