Abstract
Owing to their excellent properties, super duplex stainless steels (SDSS) are used in high technology applications in construction, chemical and shipbuilding industries. However, SDSS undergoes microstructural changes during welding that imbalances the ferrite-to-austenite ratio. This work has optimised the welding parameters such as current, arc gap, shielding gas flow rate and welding speed using Taguchi analysis with fuzzy logic reasoning to achieve higher hardness, higher penetration and nominal ferrite content for weld joints. Change of percentage of ferrite at the weld joint is examined to analyse the properties. The applicability of welded joints for marine applications is evaluated by impact test at room temperature, zero degree and subzero temperatures and by studying their corrosion behaviour. By using ER2594 electrode with optimal parameters, phase balanced weld joints with sound corrosion resistivity and mechanical properties were achieved.
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