To prevent overheating thin metal during TIG welding, which adjustment is recommended?

• A. Increase amperage and slower travel speed
• B. Lower amperage and faster travel speed
• C. Use a larger tungsten electrode
• D. Reduce shielding gas flow

Answer: (B)

Controlling heat input is key when welding thin metal. The amount of heat delivered to the work depends on the arc current and how long the arc stays on a given spot as you travel. Lowering the current reduces the energy of the arc, and moving faster reduces the time the arc spends on any one area, so less heat is deposited per inch of weld. Taken together, lowering amperage and increasing travel speed minimize the heat that reaches the thin metal, helping prevent overheating and burn-through.

The other adjustments don’t address heat input the same way: increasing current with slower travel adds more heat and raises the risk of overheating; using a larger tungsten electrode doesn’t directly reduce heat input to the workpiece; and reducing shielding gas flow doesn’t affect heat input and can cause shielding problems.