@inproceedings{WildenBergmannDollesetal.2006, author = {Wilden, J. and Bergmann, J. P. and Dolles, M. and Reich, S. and Fernandet, S. and Goecke, Sven-Frithjof}, title = {Low temperature brazing of zinc coated steel and steel/aluminium joints by setting ZnAl-alloys as brazing material}, series = {In: Brazing and soldering : proceedings of the 3rd International Brazing and Soldering Conference, April 24 - 26, 2006, Crowne Plaza Riverwalk Hotel, San Antonio, Texas, USA / sponsored by ASM International, the Materials Information Society; AWS, [American Welding Society]. Ed. by John J. Stephens ... - Materials Park, Ohio: ASM Internat., 2006. - ISBN 0-87170-838-8}, booktitle = {In: Brazing and soldering : proceedings of the 3rd International Brazing and Soldering Conference, April 24 - 26, 2006, Crowne Plaza Riverwalk Hotel, San Antonio, Texas, USA / sponsored by ASM International, the Materials Information Society; AWS, [American Welding Society]. Ed. by John J. Stephens ... - Materials Park, Ohio: ASM Internat., 2006. - ISBN 0-87170-838-8}, pages = {32 -- 39}, year = {2006}, language = {en} } @inproceedings{GoeckeDorn2000, author = {Goecke, Sven-Frithjof and Dorn, L.}, title = {MAG-ChopArc-Schweißen f{\"u}r Feinblech gr{\"o}ßer gleich 0,2 mm}, series = {In: Schweißen und Schneiden 2000 : Vortr{\"a}ge der gleichnamigen Großen Schweißtechnischen Tagung in N{\"u}rnberg vom 27. bis 29. September 2000 / Veranst.: DVS, Deutscher Verband f{\"u}r Schweißen und Verwandte Verfahren e.V.. - Als Ms. gedr. - D{\"u}sseldorf : Verl. f{\"u}r Schweißen und Verwandte Verfahren, DVS-Verl., 2000. - (DVS-Berichte ; 209). - ISBN 3-87155-667-X}, booktitle = {In: Schweißen und Schneiden 2000 : Vortr{\"a}ge der gleichnamigen Großen Schweißtechnischen Tagung in N{\"u}rnberg vom 27. bis 29. September 2000 / Veranst.: DVS, Deutscher Verband f{\"u}r Schweißen und Verwandte Verfahren e.V.. - Als Ms. gedr. - D{\"u}sseldorf : Verl. f{\"u}r Schweißen und Verwandte Verfahren, DVS-Verl., 2000. - (DVS-Berichte ; 209). - ISBN 3-87155-667-X}, pages = {163 -- 168}, year = {2000}, language = {de} } @inproceedings{DornGoecke1997, author = {Dorn, L. and Goecke, Sven-Frithjof}, title = {Influence of least active gas additions on pulsed current MIG-welding of aluminium}, series = {In: Proceedings of the International Conference on the Joining of Materials JOM-8 : May 12 - 14, 1997, Helsing{\o}r, Denmark ; [optimization of joining technology for the industrial application, case study and repair welding, advanced welding technologies and developments] / ed. by the European Institute for the Joining of Materials. - Helsing{\o}r : JOM-Inst., 1997. - ISBN 87-89582-04-7}, booktitle = {In: Proceedings of the International Conference on the Joining of Materials JOM-8 : May 12 - 14, 1997, Helsing{\o}r, Denmark ; [optimization of joining technology for the industrial application, case study and repair welding, advanced welding technologies and developments] / ed. by the European Institute for the Joining of Materials. - Helsing{\o}r : JOM-Inst., 1997. - ISBN 87-89582-04-7}, pages = {100 -- 105}, year = {1997}, language = {en} } @article{RoseZaehrSchnicketal.2011, author = {Rose, Sascha and Z{\"a}hr, Julia and Schnick, Michael and F{\"u}ssel, Uwe and Goecke, Sven-Frithjof and H{\"u}bner, Mark}, title = {Arc attachments on aluminium during tungsten electrode positive polarity in TIG welding of aluminium}, series = {In: Welding in the World 55 (2011) 9-10, pp 91-99}, volume = {55}, journal = {In: Welding in the World 55 (2011) 9-10, pp 91-99}, number = {9-10}, issn = {1878-6669}, doi = {10.1007/bf03321325}, pages = {91 -- 99}, year = {2011}, abstract = {In modem AC power sources, both balance and current of EP (tungsten electrode positive) and EN (tungsten electrode negative) can be readily adjusted. According to conventional assumptions the surface of aluminium workpieces is cleaned during EP but the tungsten electrode is more heated due to electron work function. During EN the tungsten electrode cools down and the workpiece is melted. Therefore, optimal settings of the power source mostly aim for maximal penetration and minimal electrode wear. This paper presents a study of arc attachments in TIG welding on aluminium. Two different arc attachments to the cathodic workpiece could be attested with only one of them actually cleaning the surface. The first one is a spot mode (highly dynamic) that attaches to the edges of oxide layers and cracks them. The second one is also a spot mode, but it attaches to weld pools. It does not clean the surface but heats the base material intensively. Both arc attachment modes compete against each other. As a result, the cleaning area narrows with wider weld pools due to an increasing attachment to the weld pool during EP. The influences on the arc attachment to the aluminium cathode as well as the contradictions in present literature are discussed. Possible adjustments of the AC balance for optimized processes are proposed.}, language = {en} } @article{WildenJahnMelahinetal.2010, author = {Wilden, J. and Jahn, S. and Melahin, N. and Rehfeldt, L. and Luhn, T. and Goecke, Sven-Frithjof and Schmid, E. and Berger, U.}, title = {Brazing as the key to resource-efficient and energy-efficient joining in the product life cycle}, series = {In: Welding and cutting (2010) 5, 301-312}, journal = {In: Welding and cutting (2010) 5, 301-312}, issn = {1612-3433}, pages = {301 -- 312}, year = {2010}, language = {en} } @article{WildenJahnMilahinetal.2010, author = {Wilden, J. and Jahn, S. and Milahin, N. and Luhn, T. and Rehfeldt, L. and Goecke, Sven-Frithjof and Schmid, E. and Berger, U.}, title = {Perspektiven und Visionen zum Schweissen moderner Stahlwerkstoffe}, series = {In: Stahl und Eisen 130 (2010) 10, S. 71-75}, journal = {In: Stahl und Eisen 130 (2010) 10, S. 71-75}, issn = {0340-4803}, pages = {71 -- 75}, year = {2010}, language = {de} } @article{GhoshDornGoecke2001, author = {Ghosh, P. K. and Dorn, L. and Goecke, Sven-Frithjof}, title = {Universality of correlationships among pulse parameters for different MIG Welding Power Sources}, series = {In: The international journal for the joining of materials : JOM 13 (2001), 40-47}, journal = {In: The international journal for the joining of materials : JOM 13 (2001), 40-47}, issn = {0905-6866}, pages = {40 -- 47}, year = {2001}, language = {en} } @article{BergmannWildenReichetal.2009, author = {Bergmann, J. P. and Wilden, J. and Reich, S. and Goecke, Sven-Frithjof}, title = {Methods and solutions for joining plates made from different metals using voltaic arc welding}, series = {In: Welding International 23 (2009) 12, pp 895-903}, journal = {In: Welding International 23 (2009) 12, pp 895-903}, issn = {0950-7116}, doi = {10.1080/09507110902843289}, pages = {895 -- 903}, year = {2009}, abstract = {For some years now, the light engineering sector has been in search of welding and/or joining technologies allowing high-speed processing at low temperatures. This way, damage to galvanized coating, for example in the case of steels, could be avoided or significantly reduced. Damage to the galvanized coating represents an outwardly visible phenomenon that can have a negative impact on the component's corrosion resistance. On the other hand, from the metallurgical viewpoint, controlling heat input represents an important way to solve the problems associated with heat joining of metals with incomplete solid-state solubility. The formation of fragile intermetallic phases during cooling, for example, occurs with aluminium/steel or aluminium/titanium. The process and the correct choice of filler materials are key points for the success of the joining method. In the case of the combination of aluminium and steel, zinc represents a suitable filler material, for example for brazing. The melting temperature is around 420°C and the wettability, with regard to galvanized steel, is favoured by the zinc layer, while on the aluminium part, it is possible to avoid the use of flux, thanks to the activating action of the voltaic arc. However, the low melting and vaporization temperatures of zinc make even 'short arc' processing rather difficult. Only new developments in electrical sources for welding, and in particular new processes, offer the possibility of reducing the heat input by modifying the 'short arc' process. The difficulties described are also valid for the combination of titanium and aluminium, and are associated with the formation of phases such as Ti x A1 y . Again in this case, this paper will present a strategy for joining sheets less than 2 mm thick. In the past years, an increasing number of strategies to join zinc-coated steels can be observed. Brazing represents a profitable way to join zinc-coated steels at low temperatures, reducing or avoiding zinc evaporation. In order to completely avoid damaging zinc coating, the set of ZnAl-f{\`i}llers was already investigated for laser brazing of zinc-coated steels as well as for joining steel with aluminium. Furthermore, thanks to new developments in arc wire technology, ZnAl-electrodes can be used for MIG-brazing as well. In this case, the conventional short arc, which normally does not allow brazing with zinc wires as eruption-like evaporation occurs, is modified and controlled. The drop formation on the wire tip, the metal transfer, and the heat input can be controlled and modified very precisely, so that processing of filler material can be performed easily for thin sheets (till 0.8-1.5 mm) and at low-processing speed, below 0.3-0.4 m/min. The control of the heat input occurs due to abruptly reducing the current after short arc. The disadvantages connected with a lower heat input in the base material are a restricted wetting behaviour of the zinc pool on the base material and the low-brazing speed due to a very high cooling rate. The focus of the presented investigation is the development of strategies, in order to enhance process conditions for brazing sheets of zinc-coated steels and aluminium.}, language = {en} } @inproceedings{GoeckeWildenJahnetal.2008, author = {Goecke, Sven-Frithjof and Wilden, J. and Jahn, S. and Reich, S. and Fedtke, A. and Vollertsen, F. and Thomy, C.}, title = {Technologiekette zum Produzieren, Reparieren und Recyceln von Produkten in Material-Mix-Bauweise - PROREMIX}, series = {In: Die Verbindungs-Spezialisten 2008 : Vortr{\"a}ge und Posterbeitr{\"a}ge der Veranstaltung in Dresden vom 17. bis 19. September 2008 / Veranst.: DVS - Deutscher Verband f{\"u}r Schweißen und Verwandte Verfahren e.V., D{\"u}sseldorf. - D{\"u}sseldorf : Verl. f{\"u}r Schweißen und Verwandte Verfahren, DVS-Verl., 2008. - (DVS-Berichte ; 250). - ISBN 978-3-87155-256-4}, booktitle = {In: Die Verbindungs-Spezialisten 2008 : Vortr{\"a}ge und Posterbeitr{\"a}ge der Veranstaltung in Dresden vom 17. bis 19. September 2008 / Veranst.: DVS - Deutscher Verband f{\"u}r Schweißen und Verwandte Verfahren e.V., D{\"u}sseldorf. - D{\"u}sseldorf : Verl. f{\"u}r Schweißen und Verwandte Verfahren, DVS-Verl., 2008. - (DVS-Berichte ; 250). - ISBN 978-3-87155-256-4}, pages = {375 -- 378}, year = {2008}, language = {de} } @inproceedings{WildenBergmannReichetal.2007, author = {Wilden, J. and Bergmann, J. P. and Reich, S. and Neuw{\"o}hner, P. and Goecke, Sven-Frithjof}, title = {Grundlegende Untersuchungen zum flussmittelfreien L{\"o}ten von Leichtmetall-Material-Mix Konstruktionen}, series = {In: Hart- und Hochtemperaturl{\"o}ten und Diffusionsschweißen : Vortr{\"a}ge und Posterbeitr{\"a}ge des 8. internationalen Kolloquiums in Aachen vom 19. bis 21. Juni 2007. - D{\"u}sseldorf : DVS-Verl., 2007. - (DVS-Berichte ; 243). - ISBN 978-3-87155-799-6}, booktitle = {In: Hart- und Hochtemperaturl{\"o}ten und Diffusionsschweißen : Vortr{\"a}ge und Posterbeitr{\"a}ge des 8. internationalen Kolloquiums in Aachen vom 19. bis 21. Juni 2007. - D{\"u}sseldorf : DVS-Verl., 2007. - (DVS-Berichte ; 243). - ISBN 978-3-87155-799-6}, pages = {176 -- 182}, year = {2007}, language = {de} }