Effect of heat input on microstructure and corrosion resistance of high-nitrogen austenitic stainless steel welded joints

Abstract In this study, the microstructure and corrosion resistance of high-nitrogen austenitic stainless steel welded joints with different heat inputs were investigated. A high input leads to a large width depth fusion pool low fraction δ-ferrite in weld sea. However, Cr-rich precipitates is formed under promotes formation δ-ferrite. Therefore, following tests, seam suffers severe intergranular input, highest at 6.8 kJ/cm. results random boundary affected zone (HAZ), which decreases resistance. Furthermore, test indicate that Cr-depleted area are initially corroded, HAZ.