[MW:16889] CO2 purging during TIG welding of CS service line

Our safety team recommends CO2 purging during repair welding of a 2" socket weld joint of a CS  line( consumable-  ER 70S-2 process GTAW). Traces of oil and  toxic gases  have already been removed from the loop by  flushing and CO2 purging. Still, as a precautionary measure, CO2 puging is being recommended during welding also 

 

Does it have any impact on the weld quality?

 

Thanks

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