Scientists Built a Mathematical Model to Select Optimal Welding Parameters

An international team of scientists is working to improve the quality of welding seams when welding weathering steel. SUSU scientists have identified the parameters that influence the quality of welding, and the interrelation of characteristics of the technological process and the quality characteristics of welding seams. On the basis of the data obtained during the study, a mathematical model for selecting optimal parameters was built. The study was published in a top-rated scientific journal (Q1).  

Weathering steel belongs to the class of high-strength low-alloy steels with a low carbon content and a small amount of other alloying elements (aluminium, titanium, copper, etc.). Senior Research Fellow of the SUSU Department of Welding Production Technology and Equipment, Ph.D. in the field of Mechanical Engineering, Associate Professor of the School of Mechanical Engineering of Linyi University, China, Zhao Dawei is working on methods to improve the quality of welding of weathering steel.

“This type of steel has an excellent combination of strength, ductility, formability and weldability. Moreover, this material can provide improved atmospheric corrosion resistance. Weathering steels are used in the construction of oil pipelines, bridges, ships, and buildings. The quality of welding of A606 weathering steel is very important in the production of critical welding structures such as boilers, tanks and oil pipelines,” explains the scientist.

The research was conducted at the laboratory of the department. SUSU scientists examined different combinations of welding parameters and then evaluated the quality of welding seams. On the basis of the data obtained during the study, a mathematical model was built, which allows to select optimal welding parameters at production, thus increasing the quality of welding.

“We examined the influence of certain welding variables (welding speed, welding current and wire feed speed) on the geometry of weld bead and its tensile properties. Within the framework of the study, the characteristics of the microstructure in various technological parameters of welding were identified, and the correlation between the parameters of welding and its quality indicators was analyzed. After calculating the optimal welding parameters, we performed validation to obtain high-quality welding seams. With optimal welding parameters, the quality of welding seams increases,” says Zhao Dawei.

Different welding parameters, such as voltage, welding speed, welding current, shielding gas, wire feed speed, type of wire and its diameter, influence the physical and mechanical properties of welding seams. Incorrect welding parameters can lead to unavoidable defects, which adversely affect the quality of welding. 

This project was launched in 2021. According to the previous research work, welding heat input has a strong influence on the quality of welding and is determined by the parameters of the welding process.

South Ural State University is a university of transformations, where innovative research is conducted in most of the priority fields of science and technology development. In accordance with the strategy of scientific and technological development of the Russian Federation, the university is focused on the development of big scientific interdisciplinary projects in the field of digital industry, materials science, and ecology. In 2021 SUSU became the winner in the competition under the Priority 2030 program. The university acts as a regional project office of the World-class Ural Interregional Research and Education Centre (UIREC), which is aimed at solving the tasks of the Science and Universities National Project.

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Mikhail Ivanov, photo: Danil Rakhimov
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