Mechanical properties of dissimilar welded joints of duplex 2205 and austenitic 316L steels

The presented work is the result of the author's investigations connected with the examination of the usefulness of welding methods of dissimilar welded joints for their use in industrial practice (grade 2205- X2CrNiMoCuN22-5-3 steel with the number 1.4462 and typical, low-carbon austenitic steel of grade 316L - X2CrNiMo17-12-2 steel with the number 1.4404). In order to assess the characteristics of these joints the mechanical properties tests have been conducted. Mechanical properties tests included static tensile testing, static bending testing, impact tests and hardness measurements. Static testing did not produce results indicating the differentiation of mechanical properties. Impact tests have confirmed the negative correlation between the amount of heat introduced into the weld (including linear welding energy) and the impact strength of the welded joint. Hardness tests also confirmed the relationship between the heat input and the grain size of the main phases. The results of the mechanical properties shown that the lower the linear energy, the finer morphology of the manufactured welds. (paper)