Evaluation of phase structure to corrosion rate from GTAW welding procedures employs ER316LSi, ER308LSi, and combined welds to fabricate wrought SS316L for the oil canister

This paper examines how gas tungsten arc welding (GTAW) techniques using ER316LSi and ER308LSi welding wires, influence the phase composition and corrosion rates of wrought SS316L plates. The study is framed in the context of the nuclear industry, where such materials are essential for the oil canisters of the lubricating oil systems. The research methodology consists of microstructural analysis, EDAX (Energy Dispersive X-Ray) analysis, and corrosion rate assessment. Microstructural stability was reported with the heat-affected zone (HAZ) of 87 ± 23.06 µm and grain size of 38 ± 5.29 µm. The presence of sigma (𝜎) and delta (𝛿) ferrite phases, in addition to, the improved fusion characteristics of filler metals

(particularly with the use of mixed fillers). The study analyzed 120A current variable which had the highest standard deviation amongst the tested current variables of 100A, 110A, and 120A. Corrosion testing revealed different rates for different filler metals with ER308LSi at 9.05 × 10⁻⁶ mpy, ER316LSi at 7.73 × 10⁻⁶ mpy and combined filler at 7.51 × 10⁻⁶ mpy, respectively. The results of this research will assist in welding parameter optimization and in the careful selection of filler materials to achieve corrosion resistance in target applications.

Message: Hi FE, I need help with “Evaluation of phase structure to corrosion rate from GTAW welding procedures employs ER316LSi, ER308LSi, and combined welds to fabricate wrought SS316L for the oil canister” in “Metallurgical & Materials Engineering”