Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-35374 Beitrag zu einem Tagungsband Sproesser, G.; Schenker, S.; Pittner, Andreas; Borndörfer, R.; Rethmeier, Michael; Chang, Y.-J.; Finkbeiner, M. Sustainable welding process selection based on weight space partitions Selecting a welding process for a given application is crucial with respect to the sustainability of part manufacturing. Unfortunately, since welding processes are evaluated by a number of criteria, preferences for one or the other process can be contradictory. However, the prevalent procedure of weight assignment for each criterion is subjective and does not provide information about the entire solution space. From the perspective of a decision maker it is important to be able to assess the entire set of possible weightings and answer the question which welding process is optimal for which set of weights. This issue is investigated by means of a weight space partitioning approach. Two welding processes are considered with respect to three criteria that reflect their economic and environmental performance. In order to find the most sustainable welding process the underlying weight space partition is evaluated. Elsevier B.V. 2016 Procedia CIRP 40 13th Global Conference on Sustainable Manufacturing – Decoupling Growth from Resource Use Bình Dương New City, Vietnam 16.09.2015 18.09.2015 127 132 urn:nbn:de:kobv:b43-353740 10.1016/j.procir.2016.01.077 http://creativecommons.org/licenses/by-nc-nd/3.0/de/deed.de 2016-03-15 OPUS4-35376 Beitrag zu einem Tagungsband Sproesser, G.; Pittner, Andreas; Rethmeier, Michael Increasing performance and energy efficiency of Gas Metal Arc Welding by a high power tandem process Standard Gas Metal Arc Welding (Standard GMAW) and a high power Tandem GMAW (TGMAW) process are evaluated with respect to energy efficiency. Current, voltage and overall equipment power are measured and energy consumption is determined. The new key performance indicator Electrical Deposition Efficiency is introduced to reflect the energy efficiency of GMAW processes. Additionally, wallplug efficiency of the equipment is determined in order to identify the overall energy consumption. Results show that energy efficiency as well as economic process performance can be significantly increased by application of the TGMAW process. Furthermore findings indicate that wall-plug efficiency of the equipment is independent of power level and material transfer mode. A metal plate of 30 mm thick structural steel is joined by Standard GMAW and TGMAW to demonstrate the total energy savings for a real weld. Electricity consumption is reduced by more than 20 % using the high power TGMAW process. Elsevier B.V. 2016 Procedia CIRP 40 13th Global Conference on Sustainable Manufacturing - Decoupling Growth from Resource Use Bình Dương New City, Vietnam 16.09.2015 18.09.2015 643 648 urn:nbn:de:kobv:b43-353762 10.1016/j.procir.2016.01.148 http://creativecommons.org/licenses/by-nc-nd/3.0/de/deed.de 2016-03-15 OPUS4-38290 Vortrag Pittner, Andreas GMA welding of AW-6082 using filler wires fostering grain refinement in the weld metal The application of welded aluminum constructions has increased over the last decades due to the high demand for lightweight design. In this context aluminum alloys have a significant importance especially the heat treatable Al-Mg-Si alloys. With regards to welding the heat input causes the dissolving of the precipitates yielding a degradation of the strength properties. Furthermore, there is the risk of solidification cracking during welding for Al-Mg-Si alloys, especially AW 6082-T6. As a consequence Al-Mg-Si alloys are welded using a dissimilar filler material based on 5xxxx aluminum alloys that yields a reduction of resulting strength properties in comparison to the base material. Therefore, the paper presents the application of a novel massive filler wire for Al-Mg-Si alloys. The wire consists of AW 6082 with additionally added AlTi5B1 master alloy fostering the grain refinement of the weld metal. Exemplarily for the base material AW 6082-T6 GMA welding experiments are performed using the novel filler wire 6082TiB. It could be shown that solidification cracks could totally be avoided. The tensile strength of the welded joints are evaluated and compared with weldments using a conventional 5183 filler wire. Artificial aging is performed after welding in order to improve the strength properties by solution hardening showing the potential of these alloys. 2016 10th International Conference Trends in Welding Research Tokyo, Japan 11.10.2016 14.10.2016 2016-11-17 OPUS4-38293 Vortrag Pittner, Andreas Möglichkeiten der Schweißsimulation für dickwandige Strukturen zur Vorhersage von Verzug und Eigenspannungen Möglichkeiten der Schweißstruktursimulation zur Bewertung und Auslegung dickwandiger Komponenten werden aufgezeigt und anhand von Anwendungsbeispielen erörtert. 2016 Workshop des Fraunhofer IPK "Unterpulverschweißen dickwandiger Bauteile" Berlin, Fraunhofer IPK, Germany 12.05.2016 12.05.2016 2016-11-17 OPUS4-36729 Zeitschriftenartikel Neubert, Sebastian; Pittner, Andreas; Rethmeier, Michael Experimental determination of TRIP parameter K for mild- and high strength low alloy steels and a super martensitic filler material A combined experimental numerical approach is applied to determine the transformation induced plasticity (TRIP)-parameter K for different strength low-alloy steels of grade S355J2+N and S960QL as well as the super martensitic filler CN13-4-IG containing 13 wt% chromium and 4 wt% nickel. The thermo-physical analyses were conducted using a Gleeble® 3500 facility. The thermal histories of the specimens to be tested were extracted from corresponding simulations of a real gas metal arc weldment. In contrast to common TRIP-experiments which are based on complex specimens a simple flat specimen was utilized together with an engineering evaluation method. The evaluation method was validated with literature values for the TRIP-parameter. It could be shown that the proposed approach enables a correct description of the TRIP behavior. SpringerPlus 2016 SpringerOpen 5 575 Paper 754, 1 16 urn:nbn:de:kobv:b43-367297 10.1186/s40064-016-2474-0 http://creativecommons.org/licenses/by/3.0/de/deed.de 2016-07-04 OPUS4-35880 Zeitschriftenartikel Neubert, Sebastian; Pittner, Andreas; Rethmeier, Michael Numerical sensitivity analysis of TRIP-parameter K on weld residual stresses for steel S355J2+ N A combined experimental numerical approach is applied for sensitivity analysis of the transformation induced plasticity (TRIP)-parameter K on weld residual stresses for welding of structural steel of grade S355J2+N. K was determined experimentally using the Gleeble 3500 facility. A thermomechanical FE model of the real welding process was experimentally validated against temperature field and X-ray stress measurements. Within sensitivity analyses K was varied by several orders of magnitude and the influence on the calculated residual stresses is evaluated by performing corresponding FEA. The correct order of magnitude is sufficient to reproduce the residual stresses qualitatively and quantitatively. Journal of Thermal Stresses Taylor & Francis Group 2016 Journal of Thermal Stresses 2016 39/2 201 219 10.1080/01495739.2015.1124641 2016-04-28 OPUS4-38057 Beitrag zu einem Tagungsband Neubert, S.; Pittner, Andreas; Rethmeier, Michael Experimentelle Bestimmung der umwandlungsplastischen Konstante K und deren Einfluss auf Schweißeigenspannungen Die in dieser Studie vorgestellte einfache Probengeometrie zeigt sich in Verbindung mit der angewandten Versuchs- und Auswertemethodik geeignet, um den umwandlungsplastischen (TRIP)-Parameter K unter Verwendung des thermomechanischen Simulators Gleeble® 3500 experimentell zu bestimmen. Der TRIP-Parameter K wurde für die Grundwerkstoffe S355J2+N und S960QL, sowie für den hochlegierten Zusatzwerkstoff CN13-4 -IG bestimmt. Die numerische Einflussanalyse zeigt, dass bei der Berechnung von (Oberflächen-)Schweiß­eigen-spannungen die Vernachlässigung des TRIP-Effektes kaum einen Einfluss auf die Längseigenspannungen hat. Im Gegensatz da­ zu resultieren gegenüber dem Referenzfall sig­nifikante Abweichungen der Quereigenspannungen im und um den Schweißnahtbereich. Die Verdopplung des TRIP-Parameters K ge­genüber dem Referenzfall hat nur einen ver­nachlässigbaren Einfluss auf die Längs- sowie Quereigenspannungen auf der Oberfläche. Für eine qualitative und quantitative numerische Nachbildung der experimentell bestimmten Längs- und Quereigenspannungen ist die Be­rücksichtigung der Größenordnung des materi­al-abhängigen TRIP-Parameters K notwendig. Düsseldorf DVS Media Düsseldorf 2016 35. Assistentenseminar Füge- und Schweißtechnik 2016/314 978-3-945023-55-6 35. Assistentenseminar Füge- und Schweißtechnik Institut für Werkstoff- und Fügetechnik der Otto-von­ Guericke-Universität Magdeburg 01.12.2014 03.12.2014 15 21 2016-11-02 OPUS4-38904 Beitrag zu einem Tagungsband Neubert, S.; Pittner, Andreas; Rethmeier, Michael Numerical Sensitivity Analysis of TRIP-Parameter K on Weld Residual Stresses and Weld Distortion A combined experimental numerical approach is applied for a sensitivity analysis of the transformation induced plasticity (TRIP)-parameter K on welding residual stresses and welding distortion for the welding of the low-alloyed high-strength S960QOL with the high-alloyed hig-strength filler material CN13-4-IG. A thermo-mechanical FE model of a real GMA welding process was experimentally validated against termperature field, X-Ray stress measurments and optical distortion measurement. Within the sensititvity analysis K was varied and the influence on the calculated welding residual stresses and welding distortion is evaluated by performing corresponding FEA. The correct order of K magnitude is necessary in order to reproduce the residual stresses qualitatively and quantitatively. For the sufficient reproducing of the welding distortion the transformation induced plasticity can be neglected. Graz Verlag der Technischen Universität Graz 2016 Mathematical Modelling of Weld Phenomena 11 978-3-85125-490-7 11th International Seminar - Numerical Analysis of Weldability Graz, Austria 27.09.2015 30.09.2015 361 383 2017-01-09 OPUS4-35535 Vortrag Fabry, Cagtay; Pittner, Andreas Data-based process monitoring and control in narrow-gap GMAW An experimental setup to integrate laser sensor into conventional GMAW setups via a unified control architecture is described. The setup is used to automate and monitor narrow-gap GMAW. A way to develop GMAW arc-sensors using artificial neural networks using the setup is shown. The control system is connected to a relational database to store various process measurements. The database can be accessed to filter previous weldments by numerous criteria which allows modelling of process parameter correlation among vast datasets. Such models can be used for process monitoring and control in future applications. 2016 IIW Commission I, IV, XII / SG 212 Intermediate Meeting Genova, Italy 07.03.2016 09.03.2016 2016-03-21