[{"issue":"Special issue entitled: ‘Trends on spot joining’ published in Journal of Manufacturing Processes.","publication":"Journal of Manufacturing Processes","abstract":[{"lang":"eng","text":"This study addresses the challenge of insufficient weld penetration in the outer thin low-carbon steel during\r\nresistance spot welding of three-layer dissimilar stack-ups containing advanced high-strength steels. To overcome\r\nthermal imbalance constraints, an innovative strategy leveraging plastic shell containment is proposed to elevate\r\nthe expulsion-free heat input threshold. By applying a combined preheating and ramping current profile, a coordinated “shell-first, nugget-second” sequence is achieved. This mechanism creates a solid-state barrier prior to\r\nrapid fusion, effectively preventing expulsion. Experimental results demonstrate that while the reference\r\nconstant-current schedule fails to maintain a process window under a 2 mm initial gap (IG) disturbance, the\r\nproposed strategy significantly enhances process stability. It increases the maximum expulsion-free heat input by\r\n24 % (to 6338 J) under normal conditions and by 77 % (to 6482 J) under the IG condition. Crucially, the\r\nincreased heat input drives nugget growth across all interfaces, achieving a penetration depth of 0.38 mm (48 %\r\npenetration ratio) in the low-carbon steel sheet under the gap condition. These findings validate the strategy’s\r\neffectiveness in ensuring weld quality and robustness, which is further confirmed by its transferability to a lowerresistivity DX54D cover sheet."}],"file":[{"creator":"kekeyang","date_created":"2025-12-22T08:21:51Z","file_name":"1-s2.0-S1526612525013568-main.pdf","file_size":21431773,"access_level":"closed","relation":"main_file","date_updated":"2025-12-22T08:21:51Z","file_id":"63392","content_type":"application/pdf","success":1}],"date_created":"2025-12-22T08:20:34Z","type":"journal_article","department":[{"_id":"157"}],"year":"2026","title":"Process window expansion with transferable applicability in three-layer dissimilar steel resistance spot welding via expulsion prevention","publication_identifier":{"issn":["1526-6125"]},"author":[{"orcid":"0000-0001-9201-9304","last_name":"Yang","first_name":"Keke","full_name":"Yang, Keke","id":"65085"},{"last_name":"Männer","first_name":"Leonhard","full_name":"Männer, Leonhard","id":"51255"},{"last_name":"Wang","first_name":"Zhuoqun","full_name":"Wang, Zhuoqun"},{"full_name":"Olfert, Viktoria","last_name":"Olfert","first_name":"Viktoria","id":"5974"},{"id":"84119","last_name":"Böhm","first_name":"Yannic","full_name":"Böhm, Yannic"},{"id":"7728","first_name":"David","last_name":"Hein","full_name":"Hein, David"},{"full_name":"Meschut, Gerson","last_name":"Meschut","first_name":"Gerson","orcid":"0000-0002-2763-1246","id":"32056"}],"publication_status":"published","date_updated":"2025-12-22T08:24:19Z","article_type":"original","intvolume":"       157","main_file_link":[{"url":"https://doi.org/10.1016/j.jmapro.2025.12.036","open_access":"1"}],"language":[{"iso":"eng"}],"doi":"10.1016/j.jmapro.2025.12.036","file_date_updated":"2025-12-22T08:21:51Z","citation":{"chicago":"Yang, Keke, Leonhard Männer, Zhuoqun Wang, Viktoria Olfert, Yannic Böhm, David Hein, and Gerson Meschut. “Process Window Expansion with Transferable Applicability in Three-Layer Dissimilar Steel Resistance Spot Welding via Expulsion Prevention.” <i>Journal of Manufacturing Processes</i> 157, no. Special issue entitled: ‘Trends on spot joining’ published in Journal of Manufacturing Processes. (2026): 984–1000. <a href=\"https://doi.org/10.1016/j.jmapro.2025.12.036\">https://doi.org/10.1016/j.jmapro.2025.12.036</a>.","short":"K. Yang, L. Männer, Z. Wang, V. Olfert, Y. Böhm, D. Hein, G. Meschut, Journal of Manufacturing Processes 157 (2026) 984–1000.","ieee":"K. Yang <i>et al.</i>, “Process window expansion with transferable applicability in three-layer dissimilar steel resistance spot welding via expulsion prevention,” <i>Journal of Manufacturing Processes</i>, vol. 157, no. Special issue entitled: ‘Trends on spot joining’ published in Journal of Manufacturing Processes., pp. 984–1000, 2026, doi: <a href=\"https://doi.org/10.1016/j.jmapro.2025.12.036\">10.1016/j.jmapro.2025.12.036</a>.","apa":"Yang, K., Männer, L., Wang, Z., Olfert, V., Böhm, Y., Hein, D., &#38; Meschut, G. (2026). Process window expansion with transferable applicability in three-layer dissimilar steel resistance spot welding via expulsion prevention. <i>Journal of Manufacturing Processes</i>, <i>157</i>(Special issue entitled: ‘Trends on spot joining’ published in Journal of Manufacturing Processes.), 984–1000. <a href=\"https://doi.org/10.1016/j.jmapro.2025.12.036\">https://doi.org/10.1016/j.jmapro.2025.12.036</a>","bibtex":"@article{Yang_Männer_Wang_Olfert_Böhm_Hein_Meschut_2026, title={Process window expansion with transferable applicability in three-layer dissimilar steel resistance spot welding via expulsion prevention}, volume={157}, DOI={<a href=\"https://doi.org/10.1016/j.jmapro.2025.12.036\">10.1016/j.jmapro.2025.12.036</a>}, number={Special issue entitled: ‘Trends on spot joining’ published in Journal of Manufacturing Processes.}, journal={Journal of Manufacturing Processes}, publisher={Elsevier BV}, author={Yang, Keke and Männer, Leonhard and Wang, Zhuoqun and Olfert, Viktoria and Böhm, Yannic and Hein, David and Meschut, Gerson}, year={2026}, pages={984–1000} }","ama":"Yang K, Männer L, Wang Z, et al. Process window expansion with transferable applicability in three-layer dissimilar steel resistance spot welding via expulsion prevention. <i>Journal of Manufacturing Processes</i>. 2026;157(Special issue entitled: ‘Trends on spot joining’ published in Journal of Manufacturing Processes.):984-1000. doi:<a href=\"https://doi.org/10.1016/j.jmapro.2025.12.036\">10.1016/j.jmapro.2025.12.036</a>","mla":"Yang, Keke, et al. “Process Window Expansion with Transferable Applicability in Three-Layer Dissimilar Steel Resistance Spot Welding via Expulsion Prevention.” <i>Journal of Manufacturing Processes</i>, vol. 157, no. Special issue entitled: ‘Trends on spot joining’ published in Journal of Manufacturing Processes., Elsevier BV, 2026, pp. 984–1000, doi:<a href=\"https://doi.org/10.1016/j.jmapro.2025.12.036\">10.1016/j.jmapro.2025.12.036</a>."},"quality_controlled":"1","oa":"1","status":"public","has_accepted_license":"1","page":"984-1000","_id":"63391","publisher":"Elsevier BV","user_id":"65085","ddc":["620"],"volume":157},{"status":"public","user_id":"84119","volume":5,"publisher":"Springer Science and Business Media LLC","_id":"66622","citation":{"bibtex":"@article{Böhm_Meschut_2026, title={Single-stage setting of blind rivet nuts without pre-drilling}, volume={5}, DOI={<a href=\"https://doi.org/10.1007/s44245-026-00222-x\">10.1007/s44245-026-00222-x</a>}, number={1121}, journal={Discover Mechanical Engineering}, publisher={Springer Science and Business Media LLC}, author={Böhm, Yannic and Meschut, Gerson}, year={2026} }","ama":"Böhm Y, Meschut G. Single-stage setting of blind rivet nuts without pre-drilling. <i>Discover Mechanical Engineering</i>. 2026;5(1). doi:<a href=\"https://doi.org/10.1007/s44245-026-00222-x\">10.1007/s44245-026-00222-x</a>","mla":"Böhm, Yannic, and Gerson Meschut. “Single-Stage Setting of Blind Rivet Nuts without Pre-Drilling.” <i>Discover Mechanical Engineering</i>, vol. 5, no. 1, 121, Springer Science and Business Media LLC, 2026, doi:<a href=\"https://doi.org/10.1007/s44245-026-00222-x\">10.1007/s44245-026-00222-x</a>.","chicago":"Böhm, Yannic, and Gerson Meschut. “Single-Stage Setting of Blind Rivet Nuts without Pre-Drilling.” <i>Discover Mechanical Engineering</i> 5, no. 1 (2026). <a href=\"https://doi.org/10.1007/s44245-026-00222-x\">https://doi.org/10.1007/s44245-026-00222-x</a>.","short":"Y. Böhm, G. Meschut, Discover Mechanical Engineering 5 (2026).","ieee":"Y. Böhm and G. Meschut, “Single-stage setting of blind rivet nuts without pre-drilling,” <i>Discover Mechanical Engineering</i>, vol. 5, no. 1, Art. no. 121, 2026, doi: <a href=\"https://doi.org/10.1007/s44245-026-00222-x\">10.1007/s44245-026-00222-x</a>.","apa":"Böhm, Y., &#38; Meschut, G. (2026). Single-stage setting of blind rivet nuts without pre-drilling. <i>Discover Mechanical Engineering</i>, <i>5</i>(1), Article 121. <a href=\"https://doi.org/10.1007/s44245-026-00222-x\">https://doi.org/10.1007/s44245-026-00222-x</a>"},"publication_status":"published","date_updated":"2026-07-31T07:04:13Z","intvolume":"         5","year":"2026","title":"Single-stage setting of blind rivet nuts without pre-drilling","publication_identifier":{"issn":["2731-6564"]},"author":[{"id":"84119","last_name":"Böhm","first_name":"Yannic","full_name":"Böhm, Yannic"},{"last_name":"Meschut","orcid":"0000-0002-2763-1246","first_name":"Gerson","full_name":"Meschut, Gerson","id":"32056"}],"doi":"10.1007/s44245-026-00222-x","article_number":"121","language":[{"iso":"eng"}],"abstract":[{"text":"<jats:title>Abstract</jats:title>\r\n                  <jats:p>The increasing use of thin-walled profiles in automotive battery housing construction is leading to a growing demand for one-sided access mechanical fasteners. Currently, the installation of blind rivet nuts still requires pre-drilling using chip-forming operations. In Meschut and Meyer (Vorlochfreies Setzen von Funktionselementen mittels Fließformen, Europäische Forschungsgesellschaft für Blechverarbeitung e.V. (EFB), Hannover, 2021), a chipless, two-step method for installing blind rivet nuts was developed, in which flow-drilling is the initial step. To eliminate the pre-drilling operation and optimise the joining process of blind rivet nuts, a pilot-hole-free joining method using a flow-drilling process is being pursued. The use of these blind rivet nuts can significantly simplify the joining process by eliminating chip-forming pre-drilling operations. Additionally, the screw-through capability reduces screw variance in automated fastening, optimising the feeding process by minimising the risk of incorrect screw selection. This work aims to develop a single-step process for the installation of a blind rivet nut. To achieve this, it is necessary to design the geometries of both the blind rivet nut and the flow-drill former, which also serves as the mandrel for the blind rivet nut. In addition to the geometries of the tools and functional elements, the flow-drilling process itself has been developed. Special attention is given to the pull-through and the formation of the closing head. To optimise the closing head formation, an iterative optimization process was used. The quality of the pull-through is improved by varying the tip geometries and adjusting the process parameters during flow-drilling.</jats:p>","lang":"eng"}],"publication":"Discover Mechanical Engineering","issue":"1","type":"journal_article","date_created":"2026-07-31T07:00:58Z"},{"quality_controlled":"1","publication":"Journal of Manufacturing Processes","citation":{"ieee":"Y. Böhm <i>et al.</i>, “Single-step self-punching lockbolt process and equipment development for pre-hole-free joining of aluminum sheets using a dual-die system,” <i>Journal of Manufacturing Processes</i>, vol. 155, pp. 171–184, 2025, doi: <a href=\"https://doi.org/10.1016/j.jmapro.2025.10.027\">10.1016/j.jmapro.2025.10.027</a>.","apa":"Böhm, Y., Kappe, F., Han, D., Nordmann, E., Yang, K., Jendrny, J., Gorr, E., &#38; Meschut, G. (2025). Single-step self-punching lockbolt process and equipment development for pre-hole-free joining of aluminum sheets using a dual-die system. <i>Journal of Manufacturing Processes</i>, <i>155</i>, 171–184. <a href=\"https://doi.org/10.1016/j.jmapro.2025.10.027\">https://doi.org/10.1016/j.jmapro.2025.10.027</a>","short":"Y. Böhm, F. Kappe, D. Han, E. Nordmann, K. Yang, J. Jendrny, E. Gorr, G. Meschut, Journal of Manufacturing Processes 155 (2025) 171–184.","chicago":"Böhm, Yannic, Fabian Kappe, Daxin Han, Elmar Nordmann, Keke Yang, Jörg Jendrny, Eugen Gorr, and Gerson Meschut. “Single-Step Self-Punching Lockbolt Process and Equipment Development for Pre-Hole-Free Joining of Aluminum Sheets Using a Dual-Die System.” <i>Journal of Manufacturing Processes</i> 155 (2025): 171–84. <a href=\"https://doi.org/10.1016/j.jmapro.2025.10.027\">https://doi.org/10.1016/j.jmapro.2025.10.027</a>.","mla":"Böhm, Yannic, et al. “Single-Step Self-Punching Lockbolt Process and Equipment Development for Pre-Hole-Free Joining of Aluminum Sheets Using a Dual-Die System.” <i>Journal of Manufacturing Processes</i>, vol. 155, Elsevier BV, 2025, pp. 171–84, doi:<a href=\"https://doi.org/10.1016/j.jmapro.2025.10.027\">10.1016/j.jmapro.2025.10.027</a>.","bibtex":"@article{Böhm_Kappe_Han_Nordmann_Yang_Jendrny_Gorr_Meschut_2025, title={Single-step self-punching lockbolt process and equipment development for pre-hole-free joining of aluminum sheets using a dual-die system}, volume={155}, DOI={<a href=\"https://doi.org/10.1016/j.jmapro.2025.10.027\">10.1016/j.jmapro.2025.10.027</a>}, journal={Journal of Manufacturing Processes}, publisher={Elsevier BV}, author={Böhm, Yannic and Kappe, Fabian and Han, Daxin and Nordmann, Elmar and Yang, Keke and Jendrny, Jörg and Gorr, Eugen and Meschut, Gerson}, year={2025}, pages={171–184} }","ama":"Böhm Y, Kappe F, Han D, et al. Single-step self-punching lockbolt process and equipment development for pre-hole-free joining of aluminum sheets using a dual-die system. <i>Journal of Manufacturing Processes</i>. 2025;155:171-184. doi:<a href=\"https://doi.org/10.1016/j.jmapro.2025.10.027\">10.1016/j.jmapro.2025.10.027</a>"},"type":"journal_article","date_created":"2025-10-28T09:53:07Z","publication_status":"published","date_updated":"2026-02-23T10:29:51Z","intvolume":"       155","title":"Single-step self-punching lockbolt process and equipment development for pre-hole-free joining of aluminum sheets using a dual-die system","year":"2025","status":"public","publication_identifier":{"issn":["1526-6125"]},"author":[{"id":"84119","full_name":"Böhm, Yannic","first_name":"Yannic","last_name":"Böhm"},{"id":"66459","first_name":"Fabian","last_name":"Kappe","full_name":"Kappe, Fabian"},{"full_name":"Han, Daxin","last_name":"Han","first_name":"Daxin","id":"36544"},{"first_name":"Elmar","last_name":"Nordmann","full_name":"Nordmann, Elmar"},{"full_name":"Yang, Keke","orcid":"0000-0001-9201-9304","first_name":"Keke","last_name":"Yang","id":"65085"},{"last_name":"Jendrny","first_name":"Jörg","full_name":"Jendrny, Jörg"},{"first_name":"Eugen","last_name":"Gorr","full_name":"Gorr, Eugen"},{"last_name":"Meschut","first_name":"Gerson","orcid":"0000-0002-2763-1246","full_name":"Meschut, Gerson","id":"32056"}],"user_id":"65085","doi":"10.1016/j.jmapro.2025.10.027","volume":155,"page":"171-184","_id":"62005","publisher":"Elsevier BV","language":[{"iso":"eng"}]}]