Corrosion resistance of dissimilar austenite and duplex steels welded joints

This paper describes influence of welding conditions on structure and corrosion resistance of dissimilar stainless steels welded joints. Butt joints between duplex 2205 and austenitic 316L steels were performed with the use of submerged arc welding method. The plates 15 mm in thickness were welded with beat input in the range of 1.15 - 3.2 kJ/mm using duplex steel filter metal.. Microstructure examinations and corrosion tests were carried out. ASTM G48 pitting corrosion tests and slow strain rate tests were performed. It was shown that place of the lowest resistance to stress corrosion cracking is beat affected zone at duplex steel side of dissimilar joins. That phenomenon was connected with undesirable structure of that zone consisted of coarse ferrite grains and acicular austenite precipitates.