Welding is widely used in various industrial fields because of its simple joint configuration, high joint efficiency, and excellent airtightness. However, welded structures may be susceptible to corrosion depending on the service environment; therefore, understanding the corrosion characteristics of welded joints is important. In this study, STSY304 stainless steel was used as the base material, and gas tungsten arc welding (GTAW) was performed in the flat position using STSY-308 filler rods with a diameter of 2.4 mm and a length of 1,000 mm. The specimens were exposed to ambient air and groundwater conditions for 100, 500, 1,000, and 1,500 h, and changes in specimen weight and the corrosion behavior of the face and root beads were evaluated. Under ambient air conditions, little change in specimen weight was observed up to 1,500 h, and no distinct corrosion was observed on the face bead. However, slight corrosion was observed at the start and end regions of the root bead. Under groundwater conditions, corrosion on both the face and root beads became more evident with increasing exposure time. These results indicate that the corrosion behavior of GTAW-welded STSY304 stainless steel varies depending on the exposure environment, exposure time, and bead location. The results of this study may provide useful fundamental data for corrosion assessment and corrosion-prevention design of stainless-steel welded structures.
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Abstract 1. 서론 2. 실험 및 방법 2.1 가스 텅스텐 아크 용접 2.2 용접방법 2.3 실험장치 3. 결과 및 고찰 3.1 상온 노출 3.2 지하수 노출 3.3 부식량 비교 3. 결론 후기 References