Number of Industries including marine, oil and gas, pharmaceutical are facing challenges in welding of thick section duplex stainless steel (DSS) to attain desired microstructure and mechanical properties. The DSS is dual phase structure comprising of austenite and ferrite in equal proportion. The present work is aimed to investigate microstructure and mechanical properties of DSS 2205 thick (20 mm) plate weld for pressure vessel by multi-pass shielded metal arc welding using E2209 electrode to maintain heat input 0.5–1.5 kJ/mm. Weldment was tested for ferrite measurement, tensile, impact, hardness and bend test by cutting across the weld. Scanning electron microscope and optical microscope were used to examine microstructures at weld zone and heat affected zone. In microscopic examination, widmanstetten austenite, intra granular austenite and grain boundary austenite were observed in weld zone while partially transformed austenite in heat affected zone.

包括船舶、石油和天然气、制药在内的许多行业在焊接厚截面双相不锈钢 (DSS) 以获得所需的微观结构和机械性能方面面临挑战。DSS是由等比例的奥氏体和铁素体组成的双相结构。目前的工作旨在通过使用 E2209 电极保持 0.5-1.5 kJ/mm 的热输入，通过多道保护金属电弧焊研究压力容器 DSS 2205 厚（20 毫米）板焊缝的微观结构和机械性能。通过切割焊缝对焊件进行铁素体测量、拉伸、冲击、硬度和弯曲试验。用扫描电镜和光学显微镜观察焊缝区和热影响区的显微组织。在显微检查中，widmanstetten 奥氏体，