Welder Red Seal · Question
A welder is setting up for GTAW of 6.0 mm thick Schedule 40 304L stainless steel pipe in a 5G position. The root pass will be performed with argon shielding gas. Which of the following purging techniques is most appropriate to prevent oxidation on the root side?
For stainless steel, an internal purge using an inert gas like argon is critical to prevent oxidation and maintain corrosion resistance on the root side of the
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Question: A welder is setting up for GTAW of 6.0 mm thick Schedule 40 304L stainless steel pipe in a 5G position. The root pass will be performed with argon shielding gas. Which of the following purging techniques is most appropriate to prevent oxidation on the root side?
Answer options: ✅ Internal damming and continuous argon purge after tack welding
- Backing with a flux-cored consumable and no internal purge
- External trailing shield and no internal purge
- Using a backing bar made of copper with no internal purge
Correct answer: Internal damming and continuous argon purge after tack welding
Explanation: For stainless steel, an internal purge using an inert gas like argon is critical to prevent oxidation and maintain corrosion resistance on the root side of the weld. Damming allows for localized purging, maximizing efficiency and effectiveness, especially for pipe welding.
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