SC Pressure And Process Piping Practice Questions - South Carolina Pressure And Process Piping Contractor Examination Exam

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When making an open-root GTAW butt weld on austenitic stainless process pipe, what is the primary reason to purge the inside of the pipe with inert gas?

To cool the weld so interpass temperature never matters To keep the root and heat-affected inside surface from oxidizing (sugaring) and losing corrosion resistance To replace the need for filler metal on every pass To allow E7018 to be used on the root without an oven

Correct Answer:

To keep the root and heat-affected inside surface from oxidizing (sugaring) and losing corrosion resistance

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