Faculty of Mechanical Engineering
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Item type:Publication, Hardering alloys for excavator teeth coating(Centre for Evaluation in Education and Science (CEON/CEES), 2024)M. Poser, F. Zdraveski, M. Petreski, M. Pavlović, V. JeremićThe capacity of the rotоr excavator depends to a significant extent on the backet teeth. Abrasive wear of cutting teeth and cutting edges is typical when digging sand, sandy clay and gravel in common rock environments. Of particular importance is the contribution of the correct geometry of the teeth, their position on the backet, and especially their sharpness, which they lose over time. Over time, teeth become blunt due to abrasive wear and their geometry changes. The digging resistance becomes greater, and therefore the efficiency of the rotor excavator decreases. White cast iron stands out as a base alloy that has wear resistance, but has very low toughness and often brittle fracture under impact loads. Manganese steel, although it has the property of deformation strengthening, has no wear resistance when digging in sand. This condition can be improved by choosing a material more resistant to abrasive action. Excavator teeth that fail due to abrasive wear can be protected from abrasive wear by the use of hardface coating. These hardfacing alloys are presented in this paper. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Proper edge-colorings with a rich neighbor requirement(Elsevier BV, 2024-03) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, DYNAMIC STIFFNESS OF HIGH SPEED CUTTING (HSC) LINEAR MOTOR MACHINE TOOL(Editura Politehnica, 2024)Zoran PANDILOVIn this paper a model of the feed drive system with disturbance force for High Speed Cutting (HSC) linear motor machine tool tool is given. The dynamic stiffness for the proposed model is analysed. A simulation of the influence of some parameters on feed drive dynamic stiffness is performed with the simulation program MATLAB & SIMULINK. Correctness of the proposed model is verified with an experimental measurement of the dynamic stiffness of the feed drive on the prototype HSC linear motor machine tool (HSC 11) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effect of laser beam and arc power on weld bead geometry in hybrid laser arc welding of structural steel(Centre for Evaluation in Education and Science (CEON/CEES), 2024); ; Stankoski, Marko<jats:p>Hybrid Laser Arc Welding - HLAW combines the advantages of Laser Beam Welding - LBW and Gas Metal Arc Welding - GMAW, resulting in a welding process of high welding speed, less heat input, deeper penetration into the welding material, and increased process efficiency compared to conventional welding processes. The merger of the two heat sources, laser beam and arc, in a single welding process leads to a weld joint characterized by two zones, an upper-wide zone or laser-arc zone and a lower narrow zone or laser zone. This study investigates the impact of laser beam and arc currents on the weld bead geometry in the arcleading hybrid laser arc welding process of 12 (mm) structural steel. Through systematic experimentation, single-pass hybrid laser arc welds were performed in a butt joint configuration with zero-gap at various power settings, laser beam power range 10 - 13 (kW), and arc current range 340 - 400 (A) to determine their influence on weld bead width, height, and depth. The quality level of the hybrid laser arc welds was evaluated according to ISO 12932. The results indicate that increasing laser beam power enhances weld bead depth and narrows bead width, while the arc current is directly related to weld bead height and overall smoothness. The findings show that weld bead geometry is a function of laser beam and arc power ratio, an increased ratio leads to a narrow weld bead and vice versa.</jats:p> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Hybrid laser arc welding: State of the art in technology(DUZS - Društvo za unapreñivanje zavarivanja u Srbiji, 2021-09-15)Martin Petreski, Dobre Runchev, Gligorche Vrtanoski - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of the filler material on the mechanical characteristics of structural steel GMAW and MCAW welded joints(INTERNATIONAL SCIENTIFIC JOURNAL "MACHINES, TECHNOLOGIES, MATERIALS" Issue 11/2022, 2022-11)Martin Petreski, Dobre Runchev, Gligorche Vrtanoski - Some of the metrics are blocked by yourconsent settings
Item type:Publication, IMPACT ANALYSIS OF THE HYBRID LASER ARC WELDING PARAMETERS OF STRUCTURAL STEELS – STATE OF THE ART(DUZS - Društvo za unapreñivanje zavarivanja u Srbiji, 2023-12-22)Petreski, Martin; Runchev, Dobre; Vrtanoski, Gligorche; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Welding technology of martensitic steel P91 and austenitic steel 304H – State of the art(INTERNATIONAL SCIENTIFIC JOURNAL "MACHINES, TECHNOLOGIES, MATERIALS" Issue 1/2023, 2023-03-15)Aleksandra Krstevska, Dobre Runchev, Filip Zdraveski - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of Edge Surface Quality on Hybrid Laser Arc Welding of Structural Steel S355J2(77th IIW Annual Assembly and International Conference, C-IV: Power Beam Processes, 2024-07-12)Martin, Petreski; Dobre, Runchev; Gligorche, Vrtanoski; Aleksandra, Krstevska - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Welding tehnology for steel P460NL2(Centre for Evaluation in Education and Science (CEON/CEES), 2022); <jats:p>This paper presents the development of welding technology for P460NL2 steel with a thickness of 30 mm. The technology was developed for the purpose of producing housings in which the device PIG-Pipeline Inspection/Intervention Gauge intended for testing and maintenance of pipelines is installed. In this particular case, the housings were intended for cleaning pipelines for the transport of acid-aggressive gases. The material was selected in accordance with NACE MR0175/ISO 15156 and ASME BPVC IKS standards. The welding technology is made for butt joint, root pass with GMAW, and other layers filled with SAW. Preheating and heat treatment after welding were performed to restore the structure. Standard tests are conducted such as: metallography, hardness test, tensile test and toughness, and the results are presented and commented in this paper. In conclusion, the welding technology gives satisfactory results, but, in terms of meeting the specifics of the NACE MR0103 and MR0175 standards, it shows increased hardness in the transition zone, in the HAZ.</jats:p>
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