M oritz Braun

Hamburg University of Technology, Hamburg, Germany



Additive manufacturing (AM) has seen a rapid increase in application for many applications in recent years; nevertheless, there are still technical limitation with respect to widespread industrial applications. One important aspect is the relative limited building volume of the laser powder bed fusion (LPBF) process. Thus, the joining of AM parts makes it possible to increase the volume of AM structures; however, there are currently only a few investigations on the fatigue strength of welded AM parts. In this study, local fatigue assessment methods are applied to assess the fatigue strength of butt-welded joints of 316L AM steel plates made by gas metal arc welding. To account, for the different weld seam position relative to the LBPF building process, joints were produced with weld seams parallel and vertical to the layer orientation of AM plates. For fatigue assessment, local concepts based on the micro-structural support effect hypothesis are selected. This includes the stress averaging, the critical distance, and the IBESS approach.


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