Browsing by Author "Shevtsov, Viktor"

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    Influence of Current Shunting and Technological Parameters of Spot Welding on the Strength of Joints of Dimensional Products
    (Dniprovsky State Technical University, Kamianske, 2024) Nosov, Denys; Peremitko, Valerii; Plitchenko, Serhii O.; Makarenko, Mykola; Shevtsov, Viktor
    ENG: The effect of current shunting and technological parameters of spot welding on the strength of joints of dimensional products was studied. Experiments were carried out using a spot contact welding machine type MT-1614. As the main material to be joined, structural carbon steel of the 08Yu brand was chosen in the form of plates of various thicknesses. After welding, samples were made for testing according to standard techniques for shearing, tearing, or twisting. The experimental part of the study included determining the dependence of the fracture force and weld nugget diameter on the welding current, the distance between welded spots, and the duration of the welding current pulse. It was determined that the optimal welding current to ensure high strength of welded points is 7400…8000 A. Exceeding this value leads to a decrease in strength, especially when the distance between welded spots increases. The duration of the welding current pulse also plays a significant role: the optimal increase in strength is observed with pulses lasting 0.18…0.22 s. for currents of 7900…8200 A. The dependence of the diameter of the welded spot on the distance between the welded spots and the duration of the pulse was also established. A significant increase in the distance between the welded points leads to a decrease in their diameter. On the other hand, the duration of the current pulse in the range of 0.22...0.24 s increases the diameter of the points to 22 % on average. Based on the results of the experiments, mathematical models were developed that quantitatively evaluate the influence of the investigated parameters on the strength and diameter of the welded spot. Practical recommendations include optimizing welding parameters and implementing mathematical models in the production process to predict the quality of welded joints. The obtained results will contribute to improving the quality of welded joints and the efficiency of production processes in the manufacture of large-scale products.