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Sensitization degree of the austenitic stainless steel welded joints was  investigated by electrochemical methods of the double loop electrochemical  potentiokinetic reactivation (DL EPR) in H2SO4 + KSCN solution, and by the  measurement of corrosion potential of the steel in the drop of the solution  of HNO3 + FeCl3 + HCl. The welded joints were tested by X-ray radiographic  method in order to check the presence of the weld defects. Grain size of the  base metal and the welded joints were determined by optical microscopy. Good  agreement between the results obtained by different electrochemical methods  was obtained. Heat-affected zone (HAZ) of the austenitic stainless steel  welded joints has shown significant degree of sensitization. The double loop  electrochemical potentiokinetic method gave quantitative evidence about  susceptibility of the stainless steel to intergranular corrosion

Application of electrochemical methods for the investigation of intergranular corrosion welded joint austenitic stainless steel 19Cr-9Ni