In this study, two low-conductivity media, namely condensed water (44.6 μS/cm) and dragged water (190 μS/cm), were employed to investigate 79 welded joints using the SVET. The SVET was essential due to the restricted reach of galvanic currents induced by the low-conductivity media and because the specimens kept all the three parts of the welded joints together. The SVET results revealed that the Preferential Weld Corrosion was concentrated in a narrow strip near the fusion line, owing to the formation of corrosion microcells. Additionally, the occurrence of corrosion in the analyzed welded joints was found to be influenced by the difference in composition between the weld and parent metals. Further validation of these findings was obtained through immersion tests and confocal microscopy analyses. The SVET and immersion tests were utilized to investigate of preferential weld corrosion. Groove formation, an intense local material loss, was observed.

Subject
Immersion tests, Water, Materials, Mass loss, Gas pipelines, Preferential welds, Pipelines, Condensed water, Welded joints, Gas tungsten arc welding, Immersion, Metallurgy, Types of corrosion
Keywords:
PWC, condensed water, dragged water, gas pipeline, galvanic corrosion
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2023
Association for Materials Protection and Performance (AMPP)
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