Does the torch connect to the negative terminal for aluminum welding?

• A. Sometimes
• B. Only with DCEN
• C. True
• D. False

Answer: (D)

Aluminum welding with TIG relies on polarity and current type to manage oxide and heat delivery. Aluminum is welded most effectively with AC, which automatically alternates polarity to clean the oxide on the surface while forming the weld. If you’re using DC, the torch is typically connected to the positive output, not the negative, to maintain proper arc characteristics and electrode life. Because fixed negative polarity is not standard for aluminum welding, the statement that the torch connects to the negative terminal is not correct.