Abstract
Investigations were carried out into the fatigue failure resistance of welded joints in 13KhGMRB high-strength steel in relation to the methods and technological processes of welding. Bend tests were carried out on cruciform specimens welded in CO2, in a Ar + CO2 mixture, as well as under a flux with and without preheating, with a symmetric load cycle. The results show that the maximum values of the endurance limit are recorded for welded joints produced by mechanized submerged-arc welding with preheating. The endurance limits of the welded joints produced by submerged-arc welding without preheating and in CO2 are very similar. The lowest endurance limit is typical of the welded joints produced in Ar+CO2 mixture.
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