Welder Red Seal · Question
What is the purpose of a back-purge or backing gas in GTAW?
When welding materials like stainless steel or reactive metals with GTAW, a back-purge or backing gas (usually argon) is used to protect the hot backside of the
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Question: What is the purpose of a back-purge or backing gas in GTAW?
Answer options: ✅ To protect the backside of the weld from oxidation
- To cool the workpiece rapidly after welding
- To increase the penetration depth of the weld
- To reduce spatter on the reverse side
Correct answer: To protect the backside of the weld from oxidation
Explanation: When welding materials like stainless steel or reactive metals with GTAW, a back-purge or backing gas (usually argon) is used to protect the hot backside of the weld from atmospheric contamination and oxidation, ensuring a clean and sound root pass.
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