Investigation of esidual stress in multi arc-based cooperative metal additive manufacturing

Abstract

The multi arc-based cooperative metal additive manufacturing, which consists of two or three wire and arc systems, is more suitable for larger components because of higher deposition rates compared with wire arc additive manufacturing (WAAM). These wire and arc systems can work cooperatively in a concurrent manner in the process of manufacturing the components. In this paper, the residual stress of multi arc-based cooperative metal additive manufacturing is investigated with finite element (FE) simulations. Firstly, on the basis of considering the temperature-dependent thermal-physical properties, the double ellipsoid heat source model is used to establish the calculation model of the molten pool heat transfer in the multi arc-based cooperative metal additive manufacturing. Temperature field distribution of this process is firstly calculated and analyzed. These results are fed into the thermal elastic-plastic FE models and then the stress can be calculated. The analysis of stress evolution in different positions of the deposition layer indicate that the residual stress in the inter-bead is higher than that inside the welding bead.