The effect of five shielding methods for gas tungsten arc root pass welds, on the corrosion resistance of stainless steel was evaluated in two laboratory solutions. The first experiment was performed in 6% ferric chloride solution, a test designed to corrode stainless steel. The second experiment was performed in a simulated paper machine white water solution that contained hydrogen peroxide. Argon shielding produced excellent results by maintaining corrosion resistance in both solutions. Nitrogen purging and flux coated TIG rod techniques produced variable results. Paste fluxes and welding without shielding are not recommended for root protection. They performed very poorly with the welds corroding in both tests.

Subject
Water, Piping, Fluxes, Ferric chloride, Wiring, Argon, Pastes, Nitrogen, Shielding, Coating defects, Corrosion resistance, Corrosion coupons, Stainless steel
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1999
Association for Materials Protection and Performance (AMPP)
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