Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia:

A. N. Shlegel, Head of Laboratory of the laser technologies research and application of the Engineering Center, Assistant Professor of Automation of technological processes Department, e-mail: shlegel81@rambler.ru

D. S. Gusev, Engineer of Laboratory of the laser technologies research and application of the Engineering Center
A. B. Ivanchenko, Assistant Professor, Mechanical Engineering Department

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia:

N. N. Evtikheev, Head of Laser Physics Department

Recently the most claimed at the market are technologies of body components and parts obtaining which combine multi-metal welding. Such technologies are especially needed on the railway and motor transport as well as in special production. Manufacturing of the motor transport frame units consisting of steel skeleton and sheet aluminum coating allows to improve their corrosion resistance and essentially decrease weight of the carriers, which consequently contribute to the fuel consumption lowering. Residual deformations originated from the welding process negatively affect the welded construction qualitative characteristics, such as strength, harshness, containment, corrosion resistance, etc. Stress level reduction is available by means of the welded seam form and quality, which depend on the welding process technological parameters. Determination of rational technological parameters of the welding processes requires taking into account the used rolled metal features, namely different thermal conduction of materials, significantly bigger (≈50%) coefficient of linear (thermal) expansion inherent to non-ferrous metals as compared to carbon steel, foamed metal-oxide layer formation on the surface of the weld leading to deterioration of corrosion resistance. The article is devoted to the modeling process of the laser welding modes impact upon strength properties of the weld of aluminum alloy and constructional steel sheets. Presented are an algorithm and results of the finite-element analysis simulation modeling of the butt and lap joint laser welding by the example of AMg2M (АМг2М) aluminum alloy and St3 (Ст3) steel samples. Weld strength properties obtained experimentally and by modelling are compared. It is demonstrated that the worked out simulation model of multi-metal sheets laser welding may be used for theoretical study of the butt and lap joint welding of any other heterogeneous materials.

The work was supported by the Ministry of Education and Science of the Russian Federation. Agreement on grant No. 14.577.21.0158 of November 28, 2014. Unique identifier PNIER (ПНИЭР) RFMEFI57714X0158.

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