What torch cup size is best for aluminum or large welds?

• A. #6-#8
• B. #4-#6
• C. #8-#12
• D. #10-#14

Answer: (C)

When welding aluminum or large welds, the shielding gas needs to cover a wide area around the arc and pool to prevent porosity and oxide contamination. A larger torch cup increases the shielding gas volume and broadens the gas curtain, creating a more stable and protective shield over the weld. This is especially important on aluminum, where AC welding and the oxide layer demand robust, consistent shielding to keep the weld sound. Small cups concentrate gas into a narrow cone, which is great for tight joints or thin materials but leaves the weld more exposed on big beads or aluminum. So, for aluminum or large welds, choosing a larger cup helps maintain proper shielding throughout the weld.