Reliability estimation of the ferritic steels welded joints

Abstract

It was evaluated the reliability of the welded joints of high-temperature oxidation-resistant (up to 1100°С) grade 08Х25Т steel of ferrite class GOST 5632-72 (Х8CrTi25, EN 10028-2) by the manual arc welding (111 LST EN 24063) with the coated electrodes of different classes. Is proposed the method of evaluating the reliability of the welded joints of using maximum hardness of weld material and near-weld zone and the plasticity of structure. It is established that in the connections being investigated the smallest reliability have joints that are welded by the nonfusible electrode, copper (UTP-34N) and pearlitic (UONI-13/45) electrodes, and greatest − by austenitic (UTP-068HH) and austenite-ferrite (UTP-65D) electrodes.