TY - CHAP A1 - Wilden, Johannes A1 - Jahn, Simon A1 - Reich, Sebastian A1 - Dal-Canton, Sebastian A1 - Goecke, Sven-Frithjof T1 - Controlled short arc technology - A new method for processing heat sensitive materials T2 - In: Future trends in steel development, processing technologies and applications : bringing the automotive, supplier and steel industries together / SCT 2008. Ed. by Bernhard Fuchsbauer und Hans-Joachim Wieland. [Organizer: Steel Institute VDEh, Düsseldorf, Germany]. - Düsseldorf : Verl. Stahleisen, 2008. - ISBN 978-3-514-00755-0 Y1 - 2008 SP - 368 EP - 375 ER - TY - CHAP A1 - Wilden, J. A1 - Bergmann, J. P. A1 - Reich, S. A1 - Neuwöhner, P. A1 - Goecke, Sven-Frithjof T1 - Basic investigations about the flux-free soldering of multi-material-mix lightweight constructions T1 - Grundlegende Untersuchungen zum flussmittelfreien Löten von Leichtmetall-Material-Mix Konstruktionen T2 - In: Hart- und Hochtemperaturlöten und Diffusionsschweißen : Vorträge und Posterbeiträge des 8. Internationalen Kolloquiums in Aachen vom 19. bis 21. Juni 2007. - Als Ms. gedr. - Düsseldorf : DVS-Verl., 2007. - (DVS-Berichte ; 243). - ISBN 978-3-87155-799-6 Y1 - 2007 SP - 176 EP - 182 ER - TY - CHAP A1 - Wilden, J. A1 - Bergmann, J. P. A1 - Dolles, M. A1 - Reich, S. A1 - Fernandet, S. A1 - Goecke, Sven-Frithjof T1 - Low temperature brazing of zinc coated steel and steel/aluminium joints by setting ZnAl-alloys as brazing material T2 - 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 Y1 - 2006 SP - 32 EP - 39 ER - TY - CHAP A1 - Dorn, L. A1 - Goecke, Sven-Frithjof T1 - Influence of least active gas additions on pulsed current MIG-welding of aluminium T2 - In: Proceedings of the International Conference on the Joining of Materials JOM-8 : May 12 - 14, 1997, Helsingør, 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. - Helsingør : JOM-Inst., 1997. - ISBN 87-89582-04-7 Y1 - 1997 SP - 100 EP - 105 ER - TY - JOUR A1 - Rose, Sascha A1 - Zähr, Julia A1 - Schnick, Michael A1 - Füssel, Uwe A1 - Goecke, Sven-Frithjof A1 - Hübner, Mark T1 - Arc attachments on aluminium during tungsten electrode positive polarity in TIG welding of aluminium JF - In: Welding in the World 55 (2011) 9-10, pp 91-99 N2 - 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. Y1 - 2011 U6 - https://doi.org/10.1007/bf03321325 SN - 1878-6669 VL - 55 IS - 9-10 SP - 91 EP - 99 ER - TY - JOUR A1 - Wilden, J. A1 - Jahn, S. A1 - Melahin, N. A1 - Rehfeldt, L. A1 - Luhn, T. A1 - Goecke, Sven-Frithjof A1 - Schmid, E. A1 - Berger, U. T1 - Brazing as the key to resource-efficient and energy-efficient joining in the product life cycle JF - In: Welding and cutting (2010) 5, 301-312 Y1 - 2010 SN - 1612-3433 SP - 301 EP - 312 ER - TY - JOUR A1 - Ghosh, P. K. A1 - Dorn, L. A1 - Goecke, Sven-Frithjof T1 - Universality of correlationships among pulse parameters for different MIG Welding Power Sources JF - In: The international journal for the joining of materials : JOM 13 (2001), 40-47 Y1 - 2001 SN - 0905-6866 SP - 40 EP - 47 ER - TY - JOUR A1 - Bergmann, J. P. A1 - Wilden, J. A1 - Reich, S. A1 - Goecke, Sven-Frithjof T1 - Methods and solutions for joining plates made from different metals using voltaic arc welding JF - In: Welding International 23 (2009) 12, pp 895-903 N2 - 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-fìllers 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. Y1 - 2009 U6 - https://doi.org/10.1080/09507110902843289 SN - 0950-7116 SP - 895 EP - 903 ER - TY - CHAP A1 - Dorn, Lutz A1 - Goecke, Sven-Frithjof T1 - Choparc for superior MAG-welding of thin sheets with a thickness of less than 0,2 mm T2 - In: Proceedings of the International Conference on the Joining of Materials JOM-10 : May 11 - 14, 2001, Helsingør - Denmark / ed. by the Institute for the Joining of Materials . - Gilleleje, 2001. - ISBN 87-89582-097-1 Y1 - 2001 SP - 84 EP - 89 ER - TY - CHAP A1 - Dorn, D. A1 - Goecke, Sven-Frithjof T1 - Influence of very low percentage active gas components in argon on pulsed current welding T2 - In: 30th International Symposium on Automotive Technology and Automation, Florence, Italy, 16th - 19th June 1997 ; the largest European automotive forum with international participation ; [proceedings] / [ed. by: Dieter Roller] Teil: Materials for energy-efficient vehicles. Paint and powder coating applications in the automotive industries. - Croydon : Automotive Automation Ltd., 1997. - ISBN 0-947719-94-6 Y1 - 1997 SP - 221 EP - 228 ER - TY - JOUR A1 - Ebert-Spiegel, M. A1 - Goecke, Sven-Frithjof A1 - Rethmeier, M. T1 - Efficient gap filling in MAG welding using optical sensors JF - Welding in the World Y1 - 2014 U6 - https://doi.org/10.1007/s40194-014-0145-8 SN - 0043-2288 (print) SN - 1878-6669 (online) VL - 58 IS - 5 SP - 637 EP - 647 ER -