Comparative Investigation of Multi-stranded Wire and Single Wire in Submerged Arc Welded Joints of Duplex Stainless Steel: Microstructure and Pitting Properties

In this paper, the effect of ER2209 multi-stranded wire compared to single wire on the microstructure and pitting resistance of 2205 duplex stainless steel submerged arc welded joints was studied using electron backscatter diffraction, scanning electron microscopy, energy spectrum analysis, electrochemistry and other detection techniques. Compared with single-wire welding of duplex stainless steel, the multi-stranded wire deposited more metal and doubled the welding efficiency with the same heat input, while increasing the elemental concentration of Ni in the weld metal and the proportion of austenite in the heat-affected zone. Compared with single-wire welding, multi-stranded wire welding promotes the diffusion of the main alloying elements (Cr, Mo, Ni, N) in the welded joint and improves the mechanical properties and pitting resistance of the welded joint.

Automated summary

This study investigated the effect of ER2209 multi-stranded wire on the microstructure and pitting resistance of 2205 duplex stainless steel submerged arc welded joints, compared to single wire welding. The use of multi-stranded wire resulted in more metal deposition and doubled the welding efficiency, while increasing the concentration of Ni in the weld metal and the proportion of austenite in the heat-affected zone. Multi-stranded wire welding also promoted the diffusion of main alloying elements and improved the mechanical properties and pitting resistance of the welded joint.