TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Harms, Alexander A1 - Schiebahn, Alexander A1 - Naumov, Andreas T1 - Erweiterung des Parameterfelds zum Rührreibschweißen mittels konduktiver Unterstützung JF - Schweissen und Schneiden : Fachzeitschrift für Schweißen und verwandte Verfahren Y1 - 2011 SN - 0036-7184 VL - Bd. 63 IS - H. 12 SP - 710 EP - 714 PB - DVS-Media GmbH CY - Düsseldorf ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Feldmann, Martin A1 - Pak, Daniel A1 - Geßler, Achim T1 - Kleben dünnwandiger Bauteile aus textilbewehrtem Beton JF - Schweissen und Schneiden : Fachzeitschrift für Schweißen und verwandte Verfahren Y1 - 2008 SN - 0036-7184 VL - Bd. 60 IS - H. 7/8 SP - 408 EP - 412 ER - TY - JOUR A1 - Reisgen, Uwe A1 - Schleser, Markus A1 - Abdurakhmanov, Aydemir A1 - Gumenyuk, Andrey T1 - Measuring of plasma properties induced by non-vacuum electron beam welding JF - Physics of plasma N2 - Electron beam plasma measurement was realised by means of DIABEAM system invented by ISF RWTH Aachen. The Langmuir probe method is used for measurement. The relative simplicity of the method and the possibility of dispersion of high power on the probe allow its application for the investigation of high-power electron beams. The key element of the method is a rotating thin tungsten wire, which intersects the beam transversely on its axis and collects part of the current by itself. The signals, which are registered in the DIABEAM as a voltage, were taken in the form of amplitude. The conversion of the probe current into the distribution along the beam radius was realised using the Abel’s method. A voltage-current characteristic was built for the beam current. The local electron density as well as the electron temperature, the floating potential and the plasma potential were measured and calculated by means of this characteristic. Y1 - 2012 U6 - http://dx.doi.org/10.1063/1.3675874 SN - 1089-7674 (E-Journal); 1070-664X (Print) VL - 19 IS - 1 SP - 1 EP - 7 PB - AIP Publishing CY - Melville, NY ER - TY - JOUR A1 - Reisgen, Uwe A1 - Olschok, Simon A1 - Jakobs, Stefan A1 - Schleser, Markus A1 - Mokrov, Oleg A1 - Rossiter, Eduardo T1 - Laser beam submerged arc hybrid welding JF - Physics procedia N2 - The laser beam-submerged arc hybrid welding method originates from the knowledge that, with increasing penetration depth, the laser beam process has a tendency to pore formation in the lower weld regions. The coupling with the energy-efficient submerged-arc process improves degassing and reduces the tendency to pore formation. The high deposition rate of the SA process in combination with the laser beam process offers, providing the appropriate choice of weld preparation, the possibility of welding plates with a thickness larger than 20° mm in a single pass, and also of welding thicker plates with the double-sided single pass technique. Y1 - 2012 U6 - http://dx.doi.org/10.1016/j.phpro.2012.10.016 SN - 1875-3892 N1 - Part of special issue "Laser assisted net shape engineering 7 (LANE 2012)" VL - 39 SP - 75 EP - 83 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Reichert, Walter T1 - Berufseinstieg für Wirtschaftsingenieure - Bachelor oder Master? JF - Berufsstart Y1 - 2017 ER - TY - JOUR A1 - Ramazani, Ali A1 - Li, Yang A1 - Mukherjee, Krishnendu A1 - Prahl, Ulrich A1 - Bleck, Wolfgang A1 - Abdurakhmanov, Aydemir A1 - Schleser, Markus A1 - Reisgen, Uwe T1 - Microstructure evolution simulation in hot rolled DP600 steel during gas metal arc welding JF - Computational materials science Y1 - 2013 SN - 1879-0801 (E-Book); 0927-0256 (Print) VL - Vol. 68 SP - 107 EP - 116 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Raffeis, Iris A1 - Adjei-Kyeremeh, Frank A1 - Vroomen, Uwe A1 - Westhoff, Elmar A1 - Bremen, Sebastian A1 - Hohoi, Alexandru A1 - Bührig-Polaczek, Andreas T1 - Qualification of a Ni-Cu alloy for the laser powder bed fusion process (LPBF): Its microstructure and mechanical properties JF - Applied Sciences N2 - As researchers continue to seek the expansion of the material base for additive manufacturing, there is a need to focus attention on the Ni–Cu group of alloys which conventionally has wide industrial applications. In this work, the G-NiCu30Nb casting alloy, a variant of the Monel family of alloys with Nb and high Si content is, for the first time, processed via the laser powder bed fusion process (LPBF). Being novel to the LPBF processes, optimum LPBF parameters were determined, and hardness and tensile tests were performed in as-built conditions and after heat treatment at 1000 °C. Microstructures of the as-cast and the as-built condition were compared. Highly dense samples (99.8% density) were achieved after varying hatch distance (80 µm and 140 µm) with scanning speed (550 mm/s–1500 mm/s). There was no significant difference in microhardness between varied hatch distance print sets. Microhardness of the as-built condition (247 HV0.2) exceeded the as-cast microhardness (179 HV0.2.). Tensile specimens built in vertical (V) and horizontal (H) orientations revealed degrees of anisotropy and were superior to conventionally reported figures. Post heat treatment increased ductility from 20% to 31% (V), as well as from 16% to 25% (H), while ultimate tensile strength (UTS) and yield strength (YS) were considerably reduced. Y1 - 2020 U6 - http://dx.doi.org/10.3390/app10103401 SN - 2076-3417 N1 - Special Issue Materials Development by Additive Manufacturing Techniques VL - 10 IS - Art. 3401 SP - 1 EP - 15 PB - MDPI CY - Basel ER - TY - JOUR A1 - Raatschen, Hans-Jürgen A1 - Holzner, M. A1 - Borrmann, M. A1 - Pfrang, W. T1 - Numerische Simulation von Umformprozessen mit dem expliziten FE-Programm UFO-3D Y1 - 1991 N1 - Konferenz-Einzelbericht : FEM '91, International FEM-Congress, IKO Software Service, Baden Baden, D, 18.-19.11.1991 SP - 91 EP - 105 ER - TY - JOUR A1 - Raatschen, Hans-Jürgen T1 - Fokussierung von Spannungswellen in einer krummlinig berandeten Scheibe JF - ZAMM : Zeitschrift für Angewandte Mathematik und Mechanik Y1 - 1987 SN - 1521-4001 N1 - Artikel umfasst die Seiten 11 und 12 des 30-Seiten-langen PDFs der Online-Ausgabe. VL - 67 IS - 4 SP - T230 EP - T231 ER - TY - JOUR A1 - Raatschen, Hans-Jürgen T1 - Ingenieurstudium Hundert Jahre : von der Königlichen Höheren Maschinenbauschule Aachen zu den Ingenieurfachbereichen der Fachhochschule JF - Fachblatt Y1 - 2003 VL - 2003 IS - 1 SP - 28 EP - 29 ER -