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Contents of the issue

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

The Paton Welding Journal 2020 #09
The Paton Welding Journal, 2020, #9, 31-35 pages

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

S.V. Maksymova1, I.V. Zvolinskyy1, V.V. Yurkiv1, S.M. Minakov2 and 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
2National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» 37 Peremohy Prosp., 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 simulators-samples made of galvanized steel 08ps (semi-killed) after mAg welding, plasma brazing using constant and modulated current. Reduction 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 setting the current, independently of filler material feed rate. Determination of the magnitude of residual stresses in the joints was performed by magnetoelastic method. It is shown that in plasma brazing with constant current the dimensions of the plastic strain 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 in welding to 119 mPa. Further reduction of residual stresses (up to 85 mPa) during plasma brazing of joints of galvanized steel 08ps is possible due to the use of modulated current. 18 Ref., 6 Figures. Keywords: MAG welding, plasma brazing, modulated current, residual stresses, shrinkage force, plastic deformation, elastic deformation, heat input, galvanized steel, magnetoelastic method

Received 07.08.2020


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