TY - JOUR AU - Sisodia, Raghawendra Pratap Singh AU - Gáspár, Marcell Gyula AU - Ghosh, Sumit AU - Hodúlová, Erika TI - Investigation of the effects of beam oscillations in electron beam–welded S1100M TMCP steel JF - WELDING IN THE WORLD J2 - WELD WORLD VL - 2024 PY - 2024 SP - 1 EP - 13 PG - 13 SN - 0043-2288 DO - 10.1007/s40194-024-01765-x UR - https://m2.mtmt.hu/api/publication/34825872 ID - 34825872 AB - The development of thermomechanically controlled processed (TMCP) high-strength steel (HSS) has significantly contributed to designing and developing the intricate structural components. It has broader applications in the cranes and lifting process industry (base frame, crane jibs, and crane columns), trailers, agricultural and forestry machinery, earth-moving equipment, etc. However, the development of new-grade steels with higher tensile strength led to higher requirements for welded joints, and the associated weldability issues have inspired detailed studies on electron beam welding (EBW) with different beam oscillations. Beam oscillation application with EBW processes improves the welding efficiency, weld quality, weld geometry, keyhole, etc., affecting the welded joints mechanical and microstructural properties. Thus, the present study investigates the impact and comparison of various beam oscillations on the microstructural and mechanical properties of EB-welded S1100M steel. The influence of welding parameters on the microstructure of welded joints was analyzed using a scanning electron microscope (SEM) and electron backscattered diffraction (EBSD). The analysis focused on evaluation of grain sizes, morphologies, distributions, and crystallographic orientations of different phase constituents in fusion zone (FZ) and heat-affected zone (HAZ). The mechanical properties were analyzed using hardness, tensile, and Charpy V-notch impact tests. The texture in the FZ is typically random, while the HAZ typically exhibits a strong rolling texture. In general, the cooling rate in EBW is very fast, possibly resulting in a fine-grained structure and reduced formation of coarse second-phase particles in the weld zone. The elliptical beam oscillation showed the highest hardness in HAZ 450 HV10. Elliptical beam oscillation slightly improves the welded joint’s tensile strength, and the impact test showed mixed fracture behavior. LA - English DB - MTMT ER - TY - JOUR AU - Lukács, János AU - DAKHEL, AHMAD YASSER TI - Full-scale Fatigue and Burst Tests on Notched Pipeline Girth Welds, under Complex Loading Conditions JF - ACTA POLYTECHNICA HUNGARICA J2 - ACTA POLYTECH HUNG VL - 21 PY - 2024 IS - 5 SP - 53 EP - 70 PG - 18 SN - 1785-8860 DO - 10.12700/APH.21.5.2024.5.5 UR - https://m2.mtmt.hu/api/publication/34825360 ID - 34825360 LA - English DB - MTMT ER - TY - CHAP AU - Bencs, Péter AU - Nagy, Nóra TI - A hidrogénüzemű gépjárművek kockázatelemzésének áttekintése T2 - Villamosenergia-felhasználást optimalizáló innovatív rendszer fejlesztése ipari-, lakossági fogyasztók és elektromos járművek számára 2024 konferencia kiadványa PB - Miskolci Egyetem Gépészmérnöki és Informatikai Kar, Fizikai és Elektrotechnikai Intézet, Elektrotechnikai és Elektronikai Intézeti Tanszék CY - Miskolc SN - 9789633583340 PY - 2024 SP - 23 EP - 30 PG - 8 UR - https://m2.mtmt.hu/api/publication/34803173 ID - 34803173 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Meilinger, Ákos AU - Abd Al Al, Sahm Alden TI - Ellenállás-ponthegesztési technológia fejlesztése ultra-nagyszilárdságú acélokhoz JF - HEGESZTÉSTECHNIKA J2 - HEGESZTÉSTECHNIKA VL - 35 PY - 2024 IS - 1 SP - 35 SN - 1215-8372 UR - https://m2.mtmt.hu/api/publication/34787141 ID - 34787141 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Kovács, Judit AU - Gáspár, Marcell Gyula AU - Lukács, János AU - Tervo, H. AU - Kaijalainen, A. TI - Comparative study about the results of HAZ physical simulations on different high-strength steel grades JF - WELDING IN THE WORLD J2 - WELD WORLD PY - 2024 PG - 16 SN - 0043-2288 DO - 10.1007/s40194-024-01714-8 UR - https://m2.mtmt.hu/api/publication/34685681 ID - 34685681 AB - With continuous improvements, structural steels are available in even higher strength grades above 1000 MPa yield strength. As the great majority of these steels are used in welded structures, their weldability needs to be taken into account. Several factors can cause difficulties during welding of these steels, but in this paper the softening behavior and the toughness characteristics of the heat-affected zone (HAZ) are examined. As the critical parts of the HAZ in a real welded joint are relatively small, their investigating ability is limited. However, the physical simulation provides a way of evaluating specimens made from a given material to produce the specified HAZ areas in a suitable size range for subsequent testing. In this research work, three different strength categories of high-strength structural steels (with yield strength of 960 MPa, 1100 MPa, and 1300 MPa) are investigated by physical simulation. In the case of different technological variants of gas metal arc welding (GMAW) process, the effect of the cooling time t 8/5 is investigated in different HAZ subzones considered to be critical. The thermal cycles were determined according to the Rykalin 3D model. The investigated cooling times were t 8/5 = 5 s, 15 s, and 30 s. The properties of the selected coarse-grained, intercritical and intercritically reheated coarse-grained zones are analyzed by laser scanning microscope, scanning electron microscope, hardness test, and instrumented Charpy V-notch impact toughness test. Furthermore, additional investigation like JMatPro calculations, electron backscatter diffraction measurements, and prior austenite grain size calculation were carried out. As a result of the tests, the investigated heat-affected subzones indicated higher sensitivity to the welding heat input compared to conventional structural steels. Overall, the results of the tests show that the application of shorter t 8/5 cooling time can be beneficial for the investigated high-strength steel grades, since significant toughness reduction and the risk of softening occur in the whole cooling time range. LA - English DB - MTMT ER - TY - GEN AU - Koroknai, László AU - Kuzsella, László AU - Pór, Gábor TI - Hengerelt acéllemezen történő akusztikus emissziós vizsgálat mozgató mechanizmussal PY - 2024 UR - https://m2.mtmt.hu/api/publication/34560427 ID - 34560427 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Sisodia, Raghawendra Pratap Singh AU - Weglowski, Marek AU - Sliwinski, Piotr TI - In situ localised post-weld heat treatment with electron beam welding of S690QL steel JF - Journal of Advanced Joining Processes J2 - Journal of Advanced Joining Processes VL - 9 PY - 2024 PG - 11 SN - 2666-3309 DO - 10.1016/j.jajp.2023.100182 UR - https://m2.mtmt.hu/api/publication/34453222 ID - 34453222 LA - English DB - MTMT ER - TY - JOUR AU - Meilinger, Ákos AU - Fodorné Cserépi, Mariann Zsuzsa AU - Lukács, János TI - Behaviour of aluminium/steel hybrid RSW joints under high cycle fatigue loading JF - WELDING IN THE WORLD J2 - WELD WORLD VL - 68 PY - 2024 IS - 2 SP - 427 EP - 440 PG - 14 SN - 0043-2288 DO - 10.1007/s40194-023-01663-8 UR - https://m2.mtmt.hu/api/publication/34443943 ID - 34443943 AB - The lightweight construction of automotive car bodies is the more important to reduce the fuel consumption and costs. High-strength steels and aluminium alloys are suitable for achieving these aims. Recent car bodies contain both materials, therefore necessary to make reliable joints between them. The resistance spot welding (RSW) can be used for joining of car bodies and it is applicable for aluminium/steel hybrid joints, too. High cycle fatigue (HCF) test results can be rarely found in the literature while HCF loading basically determines the lifetime of hybrid joints. 5754-H22, 6082-T6, and DP600 base materials were used for similar and hybrid RSW joints and HCF tests were performed. Number of cycles to failure values, failure modes, furthermore brittle intermetallic compound (IMC) layers were studied and analysed. In both aluminium/steel hybrid joints, the HCF test results showed better endurance limit like concerning aluminium/aluminium similar joints, but worse than steel/steel joints. For 5754-H22 alloy the endurance limit values are 648 N, 939 N, and 1285.5 N, for similar aluminium, hybrid, and similar steel joints, respectively. For 6082-T6 alloy these values are 513 N, 625.5 N, and 1285.5 N, respectively. In case of similar joints only base material fracture happens, but hybrid joint specimens show different failure modes. Base material fracture and shearing after partial base material fracture were typical failure modes in case of 5754-H22/DP600 and 6082-T6/DP600 hybrid joints, respectively. The full and partial plugging as a failure modes appeared for hybrid joints, too. The IMC layer characteristics showed opposite results in cases of hybrid joints, both the layer thicknesses of the shared and plugged joints and the thickness differences between the inner and outer parts of the joints were different. LA - English DB - MTMT ER - TY - GEN AU - Koroknai, László AU - Kuzsella, László TI - Characterization of the anisotropy of DC01 steel sheet through acoustic emission testing PY - 2023 UR - https://m2.mtmt.hu/api/publication/34560262 ID - 34560262 LA - English DB - MTMT ER - TY - JOUR AU - Kovács, Péter Zoltán TI - Joining of EN AW 6060 Pipes by Plastic Forming JF - PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING J2 - PERIOD POLYTECH MECH ENG VL - 2023 PY - 2023 SP - 1 EP - 7 PG - 7 SN - 0324-6051 DO - 10.3311/PPme.23005 UR - https://m2.mtmt.hu/api/publication/34454253 ID - 34454253 AB - The article deals with an innovative, but not widely used type of joining of aluminum pipes through experiments. The joints are formed by plastic forming. The process is carried out in one step using the principle of pipe expansion, in order to bring the mating surfaces of the two pipes into a suitable position for the subsequent joining, which is created by means of plastic instability and simultaneous pressure flanging. Experimental tests were carried out with the tools designed to create most suitable joints. The length of the plastically formed pipe sections involved in the joint, the angle of the sharpened pipe ends, and the thickness of the formed joints were analyzed. One of the main goals of this study is to determine the proper joining parameters, such as tool distance or edge tapering for further investigations. As per the test results, it can be stated that the technology is suitable for joining aluminum tubes in a cost-effective way, and based on the promising strength results, further investigations will be conducted. LA - English DB - MTMT ER -