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2020 №09 (04) DOI of Article
2020 №09 (06)

Automatic Welding 2020 #09
Avtomaticheskaya Svarka (Automatic Welding), #9, 2020, pp. 42-46

Residual stresses in thin-sheet zinc-coated steel joints after arc welding and plasma brazing

S.V. Maksymova1, I.V. Zvolinskyy1, V.V. Yurkiv1, S.N. Minakov2, V.V. Lysak2
1E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2NTU «Igor Sikorsky Kyiv Polytechnic Institute». 37 Peremohy Ave., 03056, Kyiv, Ukraine

In the manufacture of thin-walled structures by welding, residual stresses appear in them, which negatively affect the geometric parameters and quality of the obtained products. The paper presents the results of evaluation of residual stresses on simulator-samples made from galvanized steel 08ps (semi-killed) after MAG welding, and plasma brazing using constant and modulated current. Lowering of residual stresses and avoidance of brazing filler metal spattering are promoted by reduction of heat input, when making permanent joints. One of the ways contributing to it, is application of plasma brazing, which provides the ability of setting the current, independently of filler material feed rate. Determination of the magnitude of residual stresses in the joints was performed by the magnetoelastic method. It is shown that in plasma brazing with constant current the dimensions of plastic deformation zone are much smaller than in MAG welding, which is associated with a decrease in the amount of thermal energy applied to the metal. Plasma brazing with constant current allows lowering residual stresses from 149, which is obtained by welding, to 119 MPa. Further decrease of residual stresses (to 85 MPa) during plasma brazing of joints of galvanized steel 08ps is possible due to the use of modulated current. 18 Ref, 5 Fig..
Keywords: MAG welding, plasma brazing, modulated current, residual stresses, shrinkage force, plastic deformation, elastic deformation, heat input, zinc-coated steel, magnetoelastic method

Received: 07.08.2020


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