Currently superduplex stainless steels (SDSS) are being extensively employed in the petrochemical, power generation, naval and offshore industries. The uses of these materials are: pressure vessels for critical processes, heat exchangers, reactors, pipes, umbilicals, digesters, pumps and other facilities where continuous use is essential and cost is not the main limitation. However, during fabrication and assembly, or as consequence of service, repair welding operations may be necessary. Thus, in this study a simulation of welding repair by GTAW process was performed in a SDSS UNS S32750. The objective of this work was to evaluate the microstructure and the values of critical pitting resistance (CPT) in the weld metal, heat affected zone and base metal. The results obtained allows the determination of welding procedures and recommendations useful to the welding repair of SDSS.
Superduplex Stainless Steel; GTAW repair process; Corrosion resistance
