Which preparation step should be completed before striking the arc when shaping the tungsten end?

• A. Set argon gas flow
• B. Strike arc
• C. Increase amperage
• D. Turn on the machine

Answer: (A)

Establishing shielding gas flow before striking the arc is essential. When shaping the tungsten tip in GTAW, you need a steady argon shield to purge air and keep the electrode clean as you prepare the tip. If the arc is started without gas flowing, ambient air can contaminate the tungsten and the weld area, causing oxidation, an unstable arc, and defects in the weld. A proper gas flow protects the tungsten and maintains a stable shield right from the moment the arc is initiated. The other setup steps matter, but they don’t provide the immediate atmospheric protection needed during tungsten shaping, so the gas flow should be established first.