Automatic Welding, 2023, №10



2023 №10 (02)

DOI of Article 10.37434/as2023.10.03

2023 №10 (04)

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Avtomaticheskaya Svarka (Automatic Welding), #10, 2023, pp. 19-29

Technological conditions of coated electrode welding of heat-resistant low-alloy steels

S.I. Moravetskyi, A.K. Tsaryuk, V.Iu. Skulskyi, M.O. Nimko

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The objective of the work consisted in determination of admissible and critical thermal modes of manual arc welding of chromium- molybdenum-vanadium steels, based on the results of metallographic investigations and measurement of weld metal hardness in as-welded and as-heat treated condition. Experimental butt welded joints of 15Kh1M1F steel were obtained under different thermal conditions. Two parameters of the thermal mode of welding were set: heat input equal to 5.21; 7.78 or 10.2 kJ/cm and temperature of preheating of the metal being welded, equal to 50; 160; 270 or 360 ºС. Phoenix SH Kupfer 3 KC coated electrodes of EN ISO 3580-А – E ZCrMoV1 B 4 2 H5 type were used. The subject of research was metal of the welds of the above-mentioned welded joints. For all the combinations of the heat input and preheating temperature weld metal hardness was measured after welding and after high-temperature tempering. The structure of different zones of welded joint metal was studied to determine the presence of cracklike defects and nature of the microstructure. The main attention was given to weld metal structure. The critical and admissible thermal modes of welding 15Kh1M1F steel by the selected coated electrodes were determined by the quality criteria, namely nature of the microstructure and structural homogeneity, as well as degree of weld metal defectiveness. 16 Ref., 4 Tabl., 7 Fig.
Keywords: welded joints, welding consumables, weld metal, metallographic investigations, microstructure, manual arc welding, hardness, thermal welding mode, heat-resistant steel, cold cracks


Received: 12.06.2023

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