Effect of arc energy on the microstructure and electrochemical behavior of duplex stainless steel weld overlay deposited by GMAW process

ER2209 type welding consumable was used for welding overlay deposit on 2205 duplex stainless steel plate through gas metal arc welding (GMAW) at different heat inputs. The research focused on analyzing the effect of arc energy on the microstructure of the welded joint, as well as evaluating the corrosion behavior of the weld metal in a 3.5 wt% NaCl solution. The results show that the arc energy has a visible effect on the content of ferrite (δ) and austenite (γ) phases, which distinctly affects the corrosion resistance of the weld metal. It was found that the grain boundary austenite, Widmanstätten austenite, and intergranular austenite were present in all the weld metals, and the weld metal formed with a heat input of 2.206 kJ/mm had a high corrosion performance due to the high austenite content and the presence of a large content of intergranular austenite phases.