SC Boiler Installation Practice Questions - South Carolina Boiler Installation Contractor Examination Exam

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When GTAW is used for the root pass on stainless-steel boiler or condensate piping, why is an inert backing (purge) gas required?

To increase penetration by oxidizing the root To protect the inside of the root from oxygen so the stainless does not sugar (oxidize) and lose corrosion resistance To replace preheat on carbon steel To allow E7018 to be used as a GTAW filler

Correct Answer:

To protect the inside of the root from oxygen so the stainless does not sugar (oxidize) and lose corrosion resistance

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