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2021 №01 (04) DOI of Article
2021 №01 (06)

Automatic Welding 2021 #01
Avtomaticheskaya Svarka (Automatic Welding), #1, 2021, pp. 25-31

Influence of external electromagnetic field on parameters and defects of crystal lattice of metal of welded joints during underwater welding

S.Yu. Maksimov, О.М. Berdnikova, O.O. Prilipko, T.O. Alekseenko, E.V. Polovetsky
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

A study of the influence of the external electromagnetic field on the parameters and defects of the crystal lattice (dislocation) in the metal of welded joints of low-alloy steel produced under water was carried out. A mathematical model and software package for calculating density of welding and eddy currents in massive conductors, the density of magnetizing currents on the surface of ferromagnetic bodies were developed, mathematical models were used to analyze distribution of electrodynamic forces in arc welding and external electromagnetic influences and reliability of the obtained results. It was established that the external electromagnetic influence improves the quality of the weld metal, which is very important in welding critical structures operating in the water environment. It is shown that during underwater welding of joints and applying external electromagnetic influence in the metal of heat-affected-zone, a finer-grained substructure is formed with a general decrease in the density of dislocations and its uniform distribution. The estimates of the level of local internal stresses taking into account the peculiarities of distribution and density of dislocations in structural components show that their maximum level is formed during welding without external electromagnetic influence along the boundaries of upper bainite rails in the places of long dislocation clusters – concentrators of local internal stresses. The low level of local internal stresses is observed in the metal of the welded joints produced on the conditions at application of external electromagnetic influence. This is facilitated by the general decrease in the density of dislocations and their uniform distribution in the structural components of the lower bainite, which should provide the crack resistance of welded joints. 19 Ref., 1 Tabl., 5 Fig.
Keywords: underwater welding, welded joints, external electromagnetic influence, microstructure, dislocation density, dislocation hardening, local internal stresses

Received: 16.12.2020


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