How can you prevent weld contamination when welding copper or copper alloys using GTAW?

• A. Weld copper with as-is surfaces.
• B. Weld copper using oil-based cleaners.
• C. Clean thoroughly with appropriate solvents, avoid oils, use dedicated tools for copper, purge the weld area to reduce oxidation, and avoid contact with contaminated surfaces or tools.
• D. Ignore contamination; copper cleans itself.

Answer: (C)