Which option correctly describes the sequence to melt the tungsten end into the desired shape?

• A. The long sequence
• B. Set argon gas flow, then strike arc
• C. Properly install tungsten, then strike arc without other steps
• D. Turn on the machine before installing tungsten

Answer: (B)

In GTAW, shielding gas must be established before you strike the arc to protect the tungsten and the weld area from contamination. Setting the argon flow first creates a protective envelope around the electrode and the molten tip, which helps prevent oxidation and keeps the arc stable. Once the gas is flowing, you strike the arc to melt the tungsten end into the desired shape within that shield. Striking the arc with no gas flow allows the tungsten to oxidize and can lead to a contaminated tip and an unstable arc. The other options either omit the shielding step, describe an unclear or inappropriate sequence, or start the machine before components are correctly in place, which doesn’t ensure proper protection before arc initiation.