Issues »  Volume 47, Issue 8

Analysis of Structural Changes in Welded Joints of AMg6 Alloys

S. O. Abramov$^{1}$, Y. P. Synytsina$^{2}$

$^{1}$Kyiv Institute of the National Guard of Ukraine, 7 Oborony Kyyeva Str., UA-03179 Kyiv, Ukraine
$^{2}$Dnipro State University of Internal Affairs, 26 Nauky Ave., UA-49005 Dnipro, Ukraine

Received: 10.04.2025; final version - 21.05.2025. Download: PDF

Aluminium alloys are widely used in aviation, automotive, shipbuilding and other industries due to their high strength at low specific gravity, corrosion resistance, and good processability. However, during welding of these materials, significant structural changes occur that can affect the mechanical and operational characteristics of the joint. During welding, aluminium alloys are exposed to high temperatures that leads to dissolution and reprecipitation of strengthening phases in heat-strengthened alloys, to a possible increase in grain size in the heat-affected zone, which can worsen mechanical properties, as well as to formation of a dendritic structure in the weld, which affects the plasticity and strength of the joint. Due to their high thermal conductivity and wide crystallization interval, aluminium alloys are prone to hot cracks. Analysis of structural changes allows identifying the influence of the chemical composition of the alloy on the susceptibility to cracking and the formation of eutectic phases, which can contribute to the development of cracks in the weld. The distribution of residual stresses in the welded joint can cause additional structural changes that reduce the durability of the product; therefore, the age indicators of 9 and 13 years are chosen. Using the study of the microstructure, the degradation of the material in the fusion zone after welding and the influence of residual stresses on the probability of stress-corrosion cracking is assessed. The corrosion resistance of welded joints and changes in the structure of the material after welding can lead to the formation of anodic and cathodic areas that accelerates corrosion and the precipitation of secondary phases, which reduces resistance to inter-granular corrosion. Analysis of structural changes in welded joints of aluminium alloys is necessary to increase the reliability and durability of welded structures. It allows evaluating the mechanisms of material degradation, to optimize welding modes, and to develop additional heat-treatment methods to improve performance.

Key words: welded joints, alloys, thermal effect, ageing, fractograph.

URL: https://mfint.imp.kiev.ua/en/abstract/v47/i08/0799.html

DOI: https://doi.org/10.15407/mfint.47.08.0799

PACS: 06.60.Vz, 61.66.Dk, 61.72.Ff, 62.20.mt, 81.20.Vj, 81.40.Cd, 81.40.Np

Citation: S. O. Abramov and Y. P. Synytsina, Analysis of Structural Changes in Welded Joints of AMg6 Alloys, Metallofiz. Noveishie Tekhnol., 47, No. 8: 799–818 (2025) (in Ukrainian)

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