Which statement best describes shielding gas flow in TIG welding and its effects?

• A. Gas flow rate has no impact on weld quality and is only a nuisance to control.
• B. Too little flow allows oxidation and porosity; too much flow can cause turbulence and arc instability; aim for a steady, stable flow (typical 15–25 cfh) and adjust for joint geometry.
• C. Higher flow always improves weld quality and penetration.
• D. Flow should be increased until shielding gas is exhausted at the start of the weld.

Answer: (B)