A TIG nozzle may include a gas lens for what purpose?

• A. No effect on gas flow
• B. Reduces electrode wear
• C. Increases shielding gas consumption
• D. Improves gas flow pattern

Answer: (D)

A gas lens reshapes and stabilizes the shielding gas around the arc and weld pool. By guiding shielding gas through many small channels, it creates a smoother, more laminar flow and reduces turbulence, which leads to more uniform coverage of the weld area. This improved gas flow pattern protects the molten metal from contamination by the atmosphere, helping prevent porosity and oxidation and producing cleaner welds, especially at longer stick-out or higher currents. It isn’t about having no effect or reducing electrode wear, and it doesn’t inherently increase gas consumption; the main benefit is the better, more consistent shielding achieved through a smoother gas flow pattern.