Abstract
In the current work, the mechanical properties of Flux Bound Tungsten Inert Gas (FB-TIG) welds on UNS S32750 Super Duplex Stainless Steel (SDSS) produced using three flux powders viz., Silicon Dioxide (SiO2), Titanium Dioxide (TiO2) and Vanadium Pentoxide (V2O5) are investigated. Initially, tension tests were conducted to analyse the yield strength, tensile strength, and percentage elongation of the three FB-TIG welds. The highest values of yield and tensile strengths were obtained for the TiO2 FB-TIG weld, with all the welds exhibiting very good yield and tensile strength values. Then the fracture toughness of the welds was investigated by impact testing at two different temperatures, i.e. (i) at room temperature and, (ii) at sub-zero temperature of -46 °C, which is close to the Ductile to Brittle Transition Temperature (DBTT) of the SDSS base metal. The maximum value of room temperature fracture toughness was obtained for the TiO2 flux and the maximum sub-zero fracture toughness was obtained for the SiO2 flux. Furthermore, the fracture surfaces of the materials were examined by SEM fractographic examinations to analyse the mode of fracture. At the sub-zero temperature, the FB-TIG weld with V2O5 flux showed a mixed mode of fracture exhibiting both ductile and brittle mechanisms.
Published Version
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