Flux-bounded TIG welding process in duplex stainless steel: a performance enhancement study Online publication date: Thu, 14-Sep-2023
by Dipali Pandya; Amarish Badgujar; Mohamed Rafik Noor Mohamed Qureshi; Nilesh D. Ghetiya
International Journal of Materials Engineering Innovation (IJMATEI), Vol. 14, No. 3, 2023
Abstract: A new variant of activated tungsten inert gas (A-TIG) welding is flux-bounded tungsten inert gas (FB-TIG) welding. The present study explores the nature of flux gap and variation of flux as a single component over the geometry of weld bead in 2205 duplex stainless steel (DSS) FB-TIG weld joint. Significant improvement in penetration depth is observed at the flux gap at 2 mm with SiO2 flux, which is 193% higher than the TIG weld. Constriction of the arc is a predominant mechanism responsible for high penetration depth. Along with this, the article discusses the variation of welding current as a heat input over weld bead geometry, microstructure, and mechanical properties. The peak value of tensile strength of the FB-TIG weld is 10% higher than the TIG weld metal. However, the maximum microhardness of FB-TIG weld metal is 2% less than that of TIG weld metal.
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