Why is tungsten contamination from copper problematic when welding copper alloys, and how can this be prevented?

• A. Copper can cause tungsten wetting and contamination, leading to arc instability; use dedicated tungsten electrodes and tooling for copper alloys and keep copper away from tungsten preparation surfaces.
• B. Copper alloys do not affect tungsten and can reuse the same tungsten across all metals.
• C. Contamination can be prevented by increasing shielding gas flow to extreme levels.
• D. Copper should be placed near tungsten during preparation.

Answer: (A)