10th CIRP Sponsored Conference on Digital Enterprise Technologies - Digital Technologies as Enablers of Industrial Competitiveness and Sustainability, DET 2020, Budapest, Hungary, 12 - 14 October 2020, vol.54, pp.233-237
© 2021 The Author(s).Wire arc additive manufacturing (WAAM) is a metal additive manufacturing process which attracts significant attention in the manufacturing industry due to its ability to enable the production of the large components at a high deposition rate. However, high power input of the welding process causes complex heat transfer and thermal cycles which makes the WAAM process complicated. This paper presents the thermal behavior analysis of WAAM process which contributes the digital twin technology. A 3D thermal transient numerical simulation model is employed to investigate the temperature field evolution, heat input effect, temperature gradient and the effects of different cooling times on interlayer temperatures of single bead ten layer wall. The calculated temperature time diagrams and experimental measurements match well together. The results show that the heat dissipation becomes worse as the heat input increases with the same cooling time. The interlayer temperature increases 46 % percent with a doubled heat input. Temperature gradients decrease with the building height and higher heat input. Effect of different cooling time analysis show that interlayer temperatures could reach up to melting point with the building height.