NUMERICAL SIMULATION OF THE OPERATION OF ALUMINUM ALLOY JOINTS MADE BY CONTACT CAPACITOR WELDING
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Abstract
Currently, structures made of modern aluminum alloys are increasingly used and widespread in almost all areas of industrial and construction production, which is a consequence of the unique properties of physico-mechanical aluminum alloys, which make it possible to create structures of various purposes that are effective in weight, strength and aesthetic parameters, while having increased corrosion resistance compared to steel structures. However, the manufacture of structures made of aluminum alloys is a more complex technological process due to the need to use special aluminum welding methods compared to traditional methods of welding steel structures. he most common argon arc method and friction welding method with mixing of aluminum alloy structures are more difficult to implement in the field during installation and assembly of structural elements on a construction site, and require qualified personnel. For this reason, it is relevant to use other methods of welding elements of aluminum structures that do not require complex equipment and qualified personnel, similar to classical electric welding of steel structures, compared with the above more complex methods of welding aluminum structures. These technologies include modern methods of laser welding and contact capacitor spot welding, the equipment for which is very compact and mobile and does not require highly qualified personnel as for other aluminum welding technologies. The current regulatory documentation of the Russian Federation on contact ca-pacitor spot welding is descriptive and does not allow reliable design and calculation of the strength of joints of this type, which requires additional experimental and theoretical studies of such joints. Earlier laboratory tests of samples of aluminum alloy compounds by condenser welding showed in some cases a significant difference be-tween experimental data and strength calculations according to the normative methodology of compounds of this type. For this reason, the purpose of this work was to clarify regulatory solutions using numerical FEM modeling of the operation of experimentally tested 18 connections – nodes of the ceiling suspension of aluminum alloy sheets AMG2M to threaded rods made of aluminum alloy AMG3. The obtained data were compared with experimental results and previously performed data of normative calculations.
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