Guntram Wagner

Chemnitz University of Technology

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Daisy Nestler

Chemnitz University of Technology

Dietmar Eifler

University of Kaiserslautern

Thomas Uhlig

Chemnitz University of Technology

Frank Balle

University of Freiburg

D. Eifler

University of Kaiserslautern

Maik Trautmann

Chemnitz University of Technology

Lothar Kroll

Chemnitz University of Technology

B. Wielage

Chemnitz University of Technology

Vasilii Fedorov

Westsächsische Hochschule Zwickau

Susann Hausner

Chemnitz University of Technology

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Chemnitz University of Technology

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University of Kaiserslautern

Materials Science & Engineering

Fraunhofer Institute for Machine Tools and Forming Technology

Chemnitzer Werkstoffmechanik GmbH (Germany)

Fraunhofer Society

TU Dresden

Technical University of Munich

Walter de Gruyter (Germany)

Karlsruhe Institute of Technology

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Microstructural and Mechanical Investigations of Friction Stir Welded Ti/Ti‐ and Ti‐Alloy/Ti‐Alloy‐Joints

N. Buhl Guntram Wagner D. Eifler M. Gutensohn F. Zillekens

This chapter contains sections titled: Introduction Materials and Experimental Setup Results cp-Titanium Results Ti6Al4V Summary Acknowledgement

Acknowledgement

Titanium alloy

Friction Stir Welding

10.1002/9781118658345.ch15

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Morphological Evolution of Single-Core Multi-Strand Wires during Ultrasonic Metal Welding

Metals (2024)

Andreas Gester D. Yu. Ozherelkov Guntram Wagner

Ultrasonic metal welding (USMW) finds widespread utilization in automotive industries, where it is used for connecting the wire harness of the vehicle, consisting of stranded wires, to the terminals. However, the behavior of the strands during the compaction process is still understudied and often overlooked. Therefore, this work focuses on the investigation of the wire compaction behavior from a morphological point of view. A newly developed method for investigating cross-sections of such joints is introduced, facilitating area quantification of the strands for a microscale examination of compaction variations for every single strand as a function of welding time. It is shown that the deformation in the wire is not homogenous throughout the wire cross-section; instead, the formation of distinct zones is observed. Three distinct regimes dominating the welding process were observed: (i) linear reduction in nugget height with primary compaction of the nugget and sealing of the interstitial spaces between the strands for weld times from 0 s up to 1.3 s; (ii) accelerated loss of nugget height due to strong plastic deformation of the strands for weld times between 1.3 s and 1.7 s; and (iii) comprehensive welding of the individual strands and strong loss of nugget height. Furthermore, it was demonstrated that the deformation of the wire during the USMW process originates in the coupling area of the horn and the wire and not in the interface of the wire and the terminal. Therefore, it can be assumed that the temperature of the interface between the horn and the wire must be significantly higher than that of the interface between the wire and the terminal. The presented approach and new insights into the behavior of ultrasonically welded joints of stranded wires and terminals provide guidance for improving the welding process.

Cold welding

Microscale chemistry

10.3390/met14030362

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Beurteilung spezieller Fragen zur Beständigkeit hochlegierter Werkstoffe mit dem EPR-Versuch (Číhal-Test)

Materials and Corrosion (2001)

Guntram Wagner

Der elektrochemische potentiokinetische Reaktivierungs-Versuch ist ein besonders geeignetes Werkzeug, um Gefügebesonderheiten hochlegierter Werkstoffe und insbesondere ihre auch nur partielle Sensibilisierung gegen interkristalline Korrosion festzustellen und im Vergleich zu einem Referenzzustand zu quantifizieren. Nachdem der Versuch nicht nur auf Chromverarmungen durch Karbidausscheidungen reagiert, ist eine metallographische Bewertung der Prüfflächen unerläßlich. Wegen ihrer hohen Empfindlichkeit ist die Methode besonders für Forschungsaufgaben, zur Bauteilbeurteilung aber auch in der Schadensaufklärung wertvoll, als allgemeine Abnahmeprüfung wegen der unter Umständen bestehenden Mehrdeutigkeit der Aussage jedoch unserer Erfahrung nach weniger empfehlenswert oder geeignet. Abgesehen davon fehlt hierfür bisher eine allgemein anerkannte Normung. The EPR-technique to evaluate special questions on the corrosion resistance of high-alloyed materials The electrochemical potentiokinetic reactivation (EPR-)test is a very useful tool to reveal microstructural peculiarities of high-alloyed materials and especially the sensibility to intergranular corrosion even if only very localised; it is possible to quantify the results referring to a standard. As this test does not only react on chromium depletion due to carbide formation a metallographic examination of the tested surface is indispensable. Due to it's very high sensitivity this technique is highly qualified not only for research tasks but also for the evaluation of components and for failure case analysis. To our opinion this method seems less recommendable or suitable for general purposes of acceptance testing as the results may be ambiguous and, in addition, generally accepted standards are missing up to now.

10.1002/1521-4176(200101)52:1<15::aid-maco15>3.0.co;2-v

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Oxygen Deficient Silica Phosphors

The Journal of Physical Chemistry (1952)

Guntram Wagner D. G. Dobay

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen Deficient Silica PhosphorsG. H. Wagner and D. G. DobayCite this: J. Phys. Chem. 1952, 56, 4, 538–541Publication Date (Print):April 1, 1952Publication History Published online1 May 2002Published inissue 1 April 1952https://doi.org/10.1021/j150496a029RIGHTS & PERMISSIONSArticle Views43Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (495 KB) Get e-Alerts

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10.1021/j150496a029

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Low temperature joining of copper by Ag nanopaste: correlation of mechanical properties and process parameters

Welding in the World (2016)

Susann Hausner Sebastian Weis B. Wielage Guntram Wagner

Nanoparticles exhibit a decrease in sintering and melting temperature with decreasing particle size in comparison to the corresponding bulk material. After melting or sintering of the nanoparticles, the material behaves like the bulk material. Therefore, high-strength and temperature-resistant joints can be produced at low temperatures, which is of big interest for various joining tasks. Joints (substrate: Cu) were prepared with an Ag nanoparticle-containing paste. The influence of the adjustable process parameters joining pressure, joining temperature, holding time, heating rate, thickness of paste application, surface treatment, pre-drying process, and subsequent heat treatment on the strength behavior of the joints was investigated. It is shown that in particular, the joining pressure exerts an essential influence on the achievable strengths. In addition, temperature, holding time, and thickness of paste application have a significant effect on strength behavior. In contrast, the pre-drying process, heating rate, surface pre-treatment, and subsequent heat treatment possess hardly any influence on joint strength.

Particle (ecology)

10.1007/s40194-016-0381-1

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Citations (26)

Microstructure and Mechanical Properties of Friction Stir Welded AA5454‐Joints

Xavier Lang Guntram Wagner Dietmar Eifler

Friction Stir Welding

10.1002/9781118062302.ch16

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Citations (7)

Experimental and Computational Analysis of Multi‐Spot Welded Hybrid Al/CFRP‐Structures on Component Level

Advanced Engineering Materials (2013)

Sebastian Schmeer Frank Balle Mirja Didi Stefan Huxhold Guntram Wagner

Ultrasonic and induction welds are performed to realize aluminum alloy/carbon fiber reinforced polymer (CFRP) – joints on component level. A demonstrator geometry derived from a possible application is chosen and different spot arrangements are manufactured tested and analyzed at variable testing velocities. Demonstrators are modeled in ABAQUS and FEM simulations are validated with mechanical experiments in order to investigate and explain ultrasonic welded demonstrator behavior and failure progress.

Component (thermodynamics)

Spot welding

10.1002/adem.201300044

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Citations (1)

Recent Developments for Ultrasonic-Assisted Friction Stir Welding: Joining, Testing, Corrosion - an Overview

IOP Conference Series Materials Science and Engineering (2016)

Marco Thomä Guntram Wagner Benjamin Straß Christian Conrad Bernd Wolter

Due to the steadily increasing demand on innovative manufacturing processes, modern lightweight construction concepts become more and more important. Especially joints of dissimilar metals offer a variety of advantages due to their high potential for lightweight construction. The focus of the investigations was Al/Mg-joints. Friction Stir Welding (FSW) is an efficient process to realize high strength joints between these materials in ductile condition. Furthermore, for a simultaneous transmission of power ultrasound during the FSW-process (US-FSW) a positive effect on the achievable tensile strength of the Al/Mg-joints was proven.

Friction Stir Welding

10.1088/1757-899x/118/1/012014

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Westinghouse thermal barrier coatings development

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (1995)

John G. Goedjen Guntram Wagner

Westinghouse, in conjunction with the Department of Energy and Oak Ridge National Laboratory, has embarked upon a program for the development of advanced thermal barrier coatings for industrial gas turbines. Development of thermal barrier coatings (TBC`s) for industrial gas turbines has relied heavily on the transfer of technology from the aerospace industry. Significant differences in the time/temperature/stress duty cycles exist between these two coating applications. Coating systems which perform well in aerospace applications may not been optimized to meet power generation performance requirements. This program will focus on development of TBC`s to meet the specific needs of power generation applications.

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Development and Characterisation of Phenolic Resin Based Liquid Silicon Infiltrated SiC/SiC Composites with SiN<sub>x</sub> Fibre Coating

Materials science forum (2015)

Bernd Mainzer Martin Frieß Kristina Roder Daisy Nestler D. Wett

SiC/SiC ceramics consist of silicon carbide fibres embedded in a silicon carbide matrix. As an alternative to classic CVI and PIP routes, Liquid Silicon Infiltration (LSI) was chosen as a technique with short process times to obtain composites with low porosity. Silicon carbide composites show good thermal shock resistance, a low coefficient of thermal expansion and excellent physical and chemical stability at elevated temperatures and are therefore regarded as promising candidates for various applications in jet engines and in power engineering. To build up the matrix, different phenolic resin based carbon precursors were infiltrated in fibre preforms and thermally cured, pyrolysed and siliconized. The aim is to obtain a high carbon yield during pyrolysis and to control the pore morphology in a way that the following liquid silicon infiltration leads to a complete reaction of the carbon matrix with silicon to SiC. The siliconization behaviour and conversion into SiC in dependence of pore morphology and chosen precursor is analysed.At the same time a functional fibre coating has to be developed which protects the fibres from liquid silicon and simultaneously provides a weak fibre matrix bonding. A LPCVD-SiN x fibre coating has been chosen and is investigated in fibre composites especially in terms of protection and reactivity in different atmospheres during pyrolysis and siliconization.

Ceramic matrix composite

Chemical vapor infiltration

Thermal shock

10.4028/www.scientific.net/msf.825-826.224

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Citations (4)