Faculty of Mechanical Engineering

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    Sustainability and environmental life cycle analysis of welding processes
    (International Journal of Structural Integrity, Emerald Publishing Limited, 2024-07-29)
    Elisaveta Doncheva
    ;
    Nikola Avramov
    ;
    Aleksandra Krstevska
    ;
    Martin Petreski
    ;
    Jelena Djokikj
    Purpose–Welding is a widely used manufacturing process in many industries. The process consumes a lot of energy and resources, pollutes the environment, and emits gases and fumes into the atmosphere that are dangerous to human health. There are various welding processes, and the suitable welding process is usually chosen based on cost, material, and conditions. Subjectivity is the most significant impediment to selecting an optimal process. As a result, it is critical to develop the appropriate set of criteria, use the best tool and methodology, and collect sufficient data. This study examines the sustainability of welding processes and their environmental impact. Design/methodology/approach– The welding process’s sustainability was examined and discussed in general, considering the technological specifics of each welding process, physical performance, and environmental, economic, and social effects. The study investigates the environmental impact of MMAW, GMAW, and GTAW/GMAW processes through experimental work and LCA methodology. Findings– MMAW is the most environmentally harmful technology, whereas GMAW has the least impact. The GTAW/GMAW process outperformed the other processes in terms of yield stress, but the analyses revealed that it had a greater environmental impact than GMAW. Originality/value– The study provides an environmental impact summary and demonstrates the effects of welding parameters and processes. This gives users an understanding of choosing the best welding technique or making the process more environmentally friendly. These recommendations help policymakers identify hot spots and implement the right plans to achieve more sustainable manufacturing.
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    Item type:Publication,
    Integrating parametric design and additive manufacturing knowledge in Industrial design education
    (Elsevier, 2022-08-23)
    Tatjana Kandikjan
    ;
    Jelena Djokikj
    ;
    Ile Mircheski
    ;
    Elena Angeleska
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    Item type:Publication,
    Design Recommendations for FFF Parts
    (Springer, 2021)
    Jelena Djokikj
    ;
    Tatjana Kandikjan
    ;
    Ile Mircheski
    Additive Manufacturing (AM) technologies since their occurrence, they are under constantly development and improvement resulting in new applications. The unique working manner of these technologies ensures them wide range of possibilities but the lack of knowledge depicts them of wide spread use. The only way fully exploit AM is to know their advantages and restrictions in other words their characteristics. Design for AM (DfAM) is the field covering all the tools, rules and guidelines developed by various authors. With this paper we are making a contribution into this field by proposing design recommendations when designing for Fused Filament Fabrication (FFF). We choose the FFF process because is the AM process with most users, according to the sold machines. We are designing samples which are analyzed for deviations in the profile and shape, and based on the results we create the design recommendations. For the fabrication of the samples we are using open-source system.