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 - 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 - CHAP AU - Abd Al Al, Sahm Alden AU - Meilinger, Ákos ED - Koncsik, Zsuzsanna ED - Lukács, János TI - Hegesztési hőciklusok mérése különböző ellenállás-ponthegesztési technológiák esetén T2 - Kutatási eredmények a Miskolci Egyetem Gépészmérnöki és Informatikai Karának Anyagszerkezettani és Anyagtechnológiai Intézetében PB - Miskolci Egyetem, Gépészmérnöki és Informatikai Kar, Anyagszerkezettani és Anyagtechnológiai Intézet CY - Miskolc SN - 9789633583074 PY - 2023 SP - 95 EP - 106 PG - 12 UR - https://m2.mtmt.hu/api/publication/34444867 ID - 34444867 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Fodorné Cserépi, Mariann Zsuzsa AU - Meilinger, Ákos ED - Koncsik, Zsuzsanna ED - Lukács, János TI - Alumínium – acél ponthegesztett kötések viselkedése dinamikus igénybevétel esetén T2 - Kutatási eredmények a Miskolci Egyetem Gépészmérnöki és Informatikai Karának Anyagszerkezettani és Anyagtechnológiai Intézetében PB - Miskolci Egyetem, Gépészmérnöki és Informatikai Kar, Anyagszerkezettani és Anyagtechnológiai Intézet CY - Miskolc SN - 9789633583074 PY - 2023 SP - 85 EP - 94 PG - 10 UR - https://m2.mtmt.hu/api/publication/34444866 ID - 34444866 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Terdik, Gábor Szabolcs AU - Meilinger, Ákos ED - Koncsik, Zsuzsanna ED - Lukács, János TI - Hőhatásövezeti sajátosságok S690QL acél alapanyag felrakóhegesztésénél T2 - Kutatási eredmények a Miskolci Egyetem Gépészmérnöki és Informatikai Karának Anyagszerkezettani és Anyagtechnológiai Intézetében PB - Miskolci Egyetem, Gépészmérnöki és Informatikai Kar, Anyagszerkezettani és Anyagtechnológiai Intézet CY - Miskolc SN - 9789633583074 PY - 2023 SP - 75 EP - 84 PG - 10 UR - https://m2.mtmt.hu/api/publication/34444863 ID - 34444863 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Pap, Ádám AU - Gáspár, Marcell Gyula AU - Meilinger, Ákos ED - Koncsik, Zsuzsanna ED - Lukács, János TI - A CMT folyamat jellemzőinek és eljárásváltozatainak összefoglalása T2 - Kutatási eredmények a Miskolci Egyetem Gépészmérnöki és Informatikai Karának Anyagszerkezettani és Anyagtechnológiai Intézetében PB - Miskolci Egyetem, Gépészmérnöki és Informatikai Kar, Anyagszerkezettani és Anyagtechnológiai Intézet CY - Miskolc SN - 9789633583074 PY - 2023 SP - 61 EP - 74 PG - 14 UR - https://m2.mtmt.hu/api/publication/34444860 ID - 34444860 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Abd Al Al, Sahm Alden AU - Fodorné Cserépi, Mariann Zsuzsa AU - Gáspár, Marcell Gyula AU - Meilinger, Ákos TI - Resistance spot welding and dissimilar joining of automotive high-strength steels and aluminium alloys JF - GÉP J2 - GÉP VL - 74 PY - 2023 IS - 4 SP - 73 EP - 76 PG - 4 SN - 0016-8572 UR - https://m2.mtmt.hu/api/publication/34285557 ID - 34285557 LA - English DB - MTMT ER - TY - CONF AU - Meilinger, Ákos AU - Fodorné Cserépi, Mariann Zsuzsa AU - Lukács, János TI - Behaviour of aluminium/steel hybrid RSW joints under high cycle fatigue loading T2 - The 76th IIW Annual Assembly and International Conference on Welding and Joining PY - 2023 PG - 17 UR - https://m2.mtmt.hu/api/publication/34202441 ID - 34202441 LA - English DB - MTMT ER - TY - BOOK ED - Gáti, József AU - Bődi, Béla AU - Gáti, József AU - Gáspár, Marcell Gyula AU - Gremsperger, Géza AU - Gyura, László AU - Hareancz, Ferenc AU - Kovács, Zsolt Ferenc AU - Kristóf, Csaba AU - Meilinger, Ákos AU - T., Tóth László AU - Varbai, Balázs TI - Hegesztési Zsebkönyv PB - COKOM Mérnökiroda Kft. CY - Budapest PY - 2023 SP - 646 SN - 9786150177816 UR - https://m2.mtmt.hu/api/publication/34162067 ID - 34162067 N1 - Első fejezete: pp 7-135: Gáspár Marcell Gyula, Varbai Balázs: Hegesztett termékek anyagai LA - Hungarian DB - MTMT ER - TY - JOUR AU - Abd Al Al, Sahm Alden AU - Meilinger, Ákos AU - Gáspár, Marcell Gyula AU - Lukács, János TI - High Cycle Fatigue Testing of Lap Shear RSW Joints from Martensitic MS1400 Steel Sheets JF - MATERIALS SCIENCE FORUM J2 - MATER SCI FORUM VL - 1095 PY - 2023 SP - 139 EP - 151 PG - 13 SN - 0255-5476 DO - 10.4028/p-O9mwSq UR - https://m2.mtmt.hu/api/publication/34104358 ID - 34104358 AB - Resistance spot welding (RSW) is one of the most common welding methods for steel sheets, as it is mainly used to join the automotive body structure parts. Different types of ultra-high strength steels (UHSS) have become widely used in the automotive body to obtain the required demands such as lower car weight, improving crashworthiness behavior, and enhancing strength–ductility combination. Martensitic UHSS belong to the highest grades width their tensile strength above 1000 MPa. During the lifetime of the vehicle cyclic loading generally occurs, therefore the optimization of welding technology should be performed considering the fatigue resistance of the welded joints. In our research 1 mm thick standardized lap shear sheets of martensitic MS1400 steel were welded by a TECNA 8007 RSW equipment with two different welding parameter combinations. The idea was to analyze the effect of welding and pulsation parameters on joint properties under static and cyclic loading. The welding parameters have been calibrated to produce the same weld nugget size for both technological combinations. Macroscopic, hardness, and tensile-shear tests were carried out to determine the fundamental mechanical characteristics of the RSW joints. The relation between the weld nugget microstructure and mechanical properties was explored. The high cycle fatigue (HCF) tests were performed on an MTS 810.23 universal electro-hydraulic materials testing system. A statistical approach was applied during the preparation and evaluation of the investigations, which increased their reliability. Measured and analyzed data of the lap shear welded joints, prepared by different technological parameters, were compared and discussed. The parameters of the HCF experiments were calculated considering the Japanese testing method (JSME S 002-1981). In most of the samples it was observed from both welding parameter combinations that the fatigue cracks initiate and grow in curvature shape in the softened part of the heat-affected zone towards the base metals in both directions symmetrically. A slight difference was observed in the HCF resistance of the welded joints prepared by different welding parameters. LA - English DB - MTMT ER -