@article{63391,
  abstract     = {{This study addresses the challenge of insufficient weld penetration in the outer thin low-carbon steel during
resistance spot welding of three-layer dissimilar stack-ups containing advanced high-strength steels. To overcome
thermal imbalance constraints, an innovative strategy leveraging plastic shell containment is proposed to elevate
the 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
rapid fusion, effectively preventing expulsion. Experimental results demonstrate that while the reference
constant-current schedule fails to maintain a process window under a 2 mm initial gap (IG) disturbance, the
proposed strategy significantly enhances process stability. It increases the maximum expulsion-free heat input by
24 % (to 6338 J) under normal conditions and by 77 % (to 6482 J) under the IG condition. Crucially, the
increased heat input drives nugget growth across all interfaces, achieving a penetration depth of 0.38 mm (48 %
penetration ratio) in the low-carbon steel sheet under the gap condition. These findings validate the strategy’s
effectiveness in ensuring weld quality and robustness, which is further confirmed by its transferability to a lowerresistivity DX54D cover sheet.}},
  author       = {{Yang, Keke and Männer, Leonhard and Wang, Zhuoqun and Olfert, Viktoria and Böhm, Yannic and Hein, David and Meschut, Gerson}},
  issn         = {{1526-6125}},
  journal      = {{Journal of Manufacturing Processes}},
  number       = {{Special issue entitled: ‘Trends on spot joining’ published in Journal of Manufacturing Processes.}},
  pages        = {{984--1000}},
  publisher    = {{Elsevier BV}},
  title        = {{{Process window expansion with transferable applicability in three-layer dissimilar steel resistance spot welding via expulsion prevention}}},
  doi          = {{10.1016/j.jmapro.2025.12.036}},
  volume       = {{157}},
  year         = {{2026}},
}

@article{66622,
  abstract     = {{<jats:title>Abstract</jats:title>
                  <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>}},
  author       = {{Böhm, Yannic and Meschut, Gerson}},
  issn         = {{2731-6564}},
  journal      = {{Discover Mechanical Engineering}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Single-stage setting of blind rivet nuts without pre-drilling}}},
  doi          = {{10.1007/s44245-026-00222-x}},
  volume       = {{5}},
  year         = {{2026}},
}

@article{62005,
  author       = {{Böhm, Yannic and Kappe, Fabian and Han, Daxin and Nordmann, Elmar and Yang, Keke and Jendrny, Jörg and Gorr, Eugen and Meschut, Gerson}},
  issn         = {{1526-6125}},
  journal      = {{Journal of Manufacturing Processes}},
  pages        = {{171--184}},
  publisher    = {{Elsevier BV}},
  title        = {{{Single-step self-punching lockbolt process and equipment development for pre-hole-free joining of aluminum sheets using a dual-die system}}},
  doi          = {{10.1016/j.jmapro.2025.10.027}},
  volume       = {{155}},
  year         = {{2025}},
}