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6865 |
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Wednesday, March 10, 2021, Hall 1 1:35 PM Applications |
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Electron beam welding (EBW) of additively manufactured alloyed steels |
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Paul Hollmann* / Institute of Materials Engineering
TU Bergakademie Freiberg, Deutschland Martin Michler / Institue of Materials Engineering TU Bergakademie Freiberg, Germany Anja Buchwalder/ Institue of Materials Engineering TU Bergakademie Freiberg, Germany Rolf Zenker/ Institue of Materials Engineering TU Bergakademie Freiberg, Germany |
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Additive manufacturing (AM) is a highly innovative and promising fabrication process for metallic components using powder or wire based materials. To make use of the individual process advantages or in order to join AM and mechanically manufactured (MM) components, reliable welding techniques are needed. A difficult to weld hot work steel (X38, X38CrMoV5-1) and a well weldable stainless steel (316L, X2CrNiMo17-12-2) were selected for comprehensive investigations. The materials were manufactured additively by means of selective laser melting (SLM) and wire-based electron beam additive manufacturing (EBAM). For a comparative investigation, dissimilar joints were butt joined from the same base materials (316L/X38) fabricated with different production routes (MM/SLM/EBAM). The welds were characterized by means of non-destructive ultrasonic testing of longitudinal sections. The impact of the joining process on the microstructure was examined on cross-sections using light optical or scanning electron microscopy and hardness testing. As a result, similarities and differences of the welding behaviour of additively compared to conventionally produced materials are derived. Thus, optimization strategies for the welding process, such as multi-spot techniques, are discussed. |