This analysis reveals changes in microstructure and mechanical properties in duplex stainless steel joints, indicating the impact of multipass welding.
This study investigates the influence of the thermal cycle induced by the multipass weld bead when double-pulsed Gas Metal Arc Welding (GMAW-DP) is used to join duplex stainless steel (DSS) with Lean Duplex Stainless Steel (LDSS) welds, with emphasis on microestructure evolution. The microstructures of the heated affected zone (HAZ) and weld metal (WM) were analysed by light optical micorscopy (LOM), scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS) and high-energy synchrotron X-ray diffraction (HEXRD) in the different passes. They are formed by austenite and ferrite with different morphologies and fractions, associated to the dilution and thermal cycle experienced. The ferrite content was between 50 and 80%, considering the consumable used. Mechanical behaviour was evaluated by Vickers microhardness profiles. These results provide experimental data that contribute to the understanding of dissimilar welding of duplex stainless steels through GMAW-DP process.
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Poliserpi et al. (2025) studied this question.
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