Abstract
The use of low transformation temperature (LTT) alloys seems to be a promising way for reducing the residual stress level of fusion welded components. Wire and arc additive manufacturing (WAAM) is a high performance additive manufacturing process for generating large metallic components, which is based on common arc welding processes. The following article describes the investigations regarding generating LTT alloys in WAAM through in-situ alloying. Therefor a multi wire gas metal arc process in spray transfer mode is being used to generate the target LTT alloy. By using two high alloyed cold wires, it was possible to reach a chemical composition for LTT alloys, proposed by Steven and Haynes. The process showed stable behavior and it was possible to build up test specimen in form of wall shaped structures of 15 mm height. By establishing in-situ alloying for the additive manufacturing of LTTs a new field of investigations regarding the structural behavior of LTT-injected components is being opened.
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Acknowledgments
The presented investigations were carried out at RWTH Aachen University Welding and Joining Institute ISF within the framework of the Collaborative Research Centre SFB1120–236616214 “Bauteilpräzision durch Beherrschung von Schmelze und Erstarrung in Produktionsprozessen” and funded by the Deutsche Forschungs-gemeinschaft e.V. (DFG, German Research Foundation). The sponsorship and support is gratefully acknowledged.
Special thanks also go to the companies ESAB AB and EWM AG for providing welding consumables and welding machines.
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Reisgen, U., Sharma, R., Oster, L. (2021). In-Situ Alloying in Gas Metal Arc Welding for Wire and Arc Additive Manufacturing. In: Reisgen, U., Drummer, D., Marschall, H. (eds) Enhanced Material, Parts Optimization and Process Intensification. EMPOrIA 2020. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-70332-5_15
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