Stress corrosion of haz of heterogeneous welding joints of duplex and austenitic steels

The article presents the investigations of corrosion properties of welded heterogenous joints. These joints were made on the basis of typical duplex steel (grade 2205X2CrNiMoCuN22-5-3 steel with the number 1.4462) and typical, low-carbon austenitic steel (grade 316L X2CrNiMo17-12-2 steel with the number 1.4404) using the welding wire P5 (Avesta, Sweden). The aim of the research was to analyze the impact of joint type and binder material on the stress corrosion of these welded joints. These samples had a round cross section. The narrower part, in the scope of which the research was conducted, had a diameter of 5 mm and the fixing part M10. The entire sample was 133 mm long and the test piece 52 mm. Two test samples were prepared for each of the joints. The samples were mounted in the pull-off brackets so that they were immersed in the solution whose corrosive action was tested. The tests show that integranullar corrosion causes fractures at the side of the hypothetically stronger 2205 duplex steel.