Welder Red Seal · Question
A welder is setting up to GTAW an open root butt joint on 2.0 mm thick 304 stainless steel tubing. Which of the following purging methods would be most effective and economical for a single, small diameter tube?
For small diameter tubing, creating a localized purge chamber using an insoluble purge dam (like water-soluble paper or commercial expandable plugs) to contain
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Question: A welder is setting up to GTAW an open root butt joint on 2.0 mm thick 304 stainless steel tubing. Which of the following purging methods would be most effective and economical for a single, small diameter tube?
Answer options:
- Backing with a copper chill bar. ✅ Using a homemade purge dam with insoluble paper and an inert gas.
- Flooding the entire working area with argon.
- Applying a flux paste to the root of the weld.
Correct answer: Using a homemade purge dam with insoluble paper and an inert gas.
Explanation: For small diameter tubing, creating a localized purge chamber using an insoluble purge dam (like water-soluble paper or commercial expandable plugs) to contain the inert gas (e.g., argon) is both effective at preventing oxidation and economical as it conserves gas. Copper chill bars absorb heat but don't prevent oxidation, and flooding large areas is wasteful.
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