Faculty of Mechanical Engineering

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Author: search.filters.author.Krstevska, AleksandraSubject: search.filters.subject.welding

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    E. Doncheva, M.Petreski, A.Krstevska N.Avramov, J.Djokikj, “Sustainability assessment of welding processes: a review “, IIW 2022 International Conference on Welding and Joining - Innovative Welding and Joining Technologies to achieve Carbon Neutrality and promote Sustainable Development, (21-23.07.2022), Tokyo, Japan, Program | IIW2022.
    (The International Institute of Welding (IIW), 2022-07-21)
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    Petreski, Martin
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    Krstevska, Aleksandra
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    Over the past several years, sustainability has become an important performance metric in industry and a significant driver for the development of innovative concepts and technologies, taking into account economic, social and environmental aspects. Welding is one of the major techniques used in manufacturing industries that requires a large amount of energy and resources and also it is considered dangerous to health and the environment. Energy-saving and constraints in carbon emissions have become a priority in the manufacturing sector therefore, the minimum energy-oriented sustainable welding processes are highly recommended. This paper aims to provide a structured overview of the wide field of research in sustainable production with a focus on the sustainability assessment of welding processes. It describes and outlines the available methodologies used and explores the most recent advances in the field. Based on a broad literature review, research gaps are identified and the scope of future work is discussed. Furthermore, this paper contributes to the advancement of current practices in measuring and assessing the sustainability of welding processes.
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    Sustainability and application of life cycle assessment in welded structures
    (SCIENTIFIC TECHNICAL UNION OF MECHANICAL ENGINEERING INDUSTRY-4.0, 2023-01-08)
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    Krstevska, Aleksandra
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    Petreski, Martin
    As global environmental impacts have increased, modern societies have expressed a strong interest in implementing sustainable solutions to reduce emissions and use operational energy and natural resources. The construction industry is a leading promoter of significant environmental impacts because it consumes a significant amount of water, energy, and materials. Steel and welding are critical in all three major sectors of the industry: construction, infrastructure, and industry. This paper discusses the significance of meeting sustainable development goals in welded structures and identifies ways that this industry can help to reduce environmental impact and improve employment conditions while achieving economic growth, saving time, and maintaining structural quality. The paper discusses how to optimize various aspects ranging from raw material extraction to construction waste disposal using the life cycle assessment (LCA) methodology. It provides a starting point and demonstrates how these tools can contribute to more sustainable welded structures.
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    Sustainability and application of life cycle assessment in welded structures
    (SCIENTIFIC TECHNICAL UNION OF MECHANICAL ENGINEERING INDUSTRY-4.0, 2023-11-08)
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    Krstevska, Aleksandra
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    Petreski, Martin
    As global environmental impacts have increased, modern societies have expressed a strong interest in implementing sustainable solutions to reduce emissions and use operational energy and natural resources. The construction industry is a leading promoter of significant environmental impacts because it consumes a significant amount of water, energy, and materials. Steel and welding are critical in all three major sectors of the industry: construction, infrastructure, and industry. This paper discusses the significance of meeting sustainable development goals in welded structures and identifies ways that this industry can help to reduce environmental impact and improve employment conditions while achieving economic growth, saving time, and maintaining structural quality. The paper discusses how to optimize various aspects ranging from raw material extraction to construction waste disposal using the life cycle assessment (LCA) methodology. It provides a starting point and demonstrates how these tools can contribute to more sustainable welded structures
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    Solutions and Procedures for Repairing a Damaged Vertical Cylindrical Tank – Depositor
    (ELSEVIER B.V., 2023)
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    Gochev, Viktor
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    Krstevska, Aleksandra
    This research paper describes and evaluates the options for repairing and rehabilitating a damaged vertical cylindrical tank (depositor). The vertical cylindrical tank is part of a wastewater treatment plant located in the vicinity of a metallurgical plant for the production of ferrosilicon Jugohrom Alzar LTD, and its components, shell, and floor are severely damaged as a result of the tank's long-term exploitation and improper maintenance. The tank is used in a wastewater treatment plant station to reduce and neutralize the carcinogen hexavalent chromium (Cr VI) into Cr-III. Two repair techniques are analyzed and investigated. The first is to repair the damage by restoring the required projected thickness of the sheet metal walls through repair welding. The other method is to apply liquid metals to the damaged areas to achieve the required projected thickness of the materials of the individual components. Mechanical tests are required regardless of which of the two repair methods is used. In order to obtain a more realistic picture of the influence of the weld, respectively of the liquid metal, samples were made according to the tensile test standard, ISO 6892-1, on which damages similar to those found on the tank were done. The obtained experimental results, along with the discussions for future research possibilities, contribute to upgrading and enhancing current knowledge in the direction of finding the most appropriate way to repair the damage that occurs in vertical cylindrical tanks as a result of their long-term exploitation.
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    PROCEDURES OF WELDING METAL PRODUCTS WITH MIG/MAG ROBOT WELDING
    (Mechanical engineering scientific journal, 2023)
    Krstevska, Aleksandra
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    This research paper describes robot welding programming and different approach of three appli-cations in manufacturing processes by welding. It gives an overview of robot manipulator and its main components. For the experimental work a 6-axis robot arm is used and three different welds are made. Detailing of programming for every example with or without synchronization with the positioner and the trajectory is discussed. The paper presents steps of software development for online programming of a robot arm with or without synchronization.
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    WIRE-ARC ADDITIVE MANUFACTURING: RECENT DEVELOPMENTS AND POTENTIAL
    (The Academy of Applied Technical Studies Belgrad, 2023-12-15)
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    Krstevska, Aleksandra
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    Wire-arc additive manufacturing (WAAM) is a promising technology for producing medium and large components without traditional subtracting technologies. It is a hybrid of two manufacturing techniques: additive manufacturing and welding. The use of this technology has grown significantly due to advantages such as material and energy savings while achieving high deposition rates and low cost. However, there are some issues with microstructure homogeneity, and properties are affected due to the complexity of the arc-induced thermal cycles and metallurgical mechanisms, resulting in high residual stresses, distortion, porosity, cracks, and delamination. This article summarises the progress made in the field of wire additive manufacturing, with a focus on welding systems, tool path design software, material analysis, and control systems. It also highlights some critical aspects that must be addressed to ensure high-quality production, such as control and diagnosis mechanisms for defect monitoring, the effects of parameters and their optimisation possibilities for improving quality, ensuring process stability, and possible post-deposition heat treatments. The conclusions suggest further improvements to the wire-additive manufacturing process in terms of accuracy, reliability, and efficacy, as well as future applications of the technology and research activities.