Effect of double-sided deposition on deformation and stress of wire arc additive manufacturing wall parts

Aiming at the problem of unidirectional heat accumulation caused by unidirectional stacking in conventional wire arc additive manufacturing（ WAAM）,a double-sided deposition strategy was proposed in this paper,namely the same material was alternately deposited on both sides of the substrate to balance the larger bending moment around the neutral axis of the formed part generated by the unidirectional heat input of the traditional single-sided deposition,so as to reduce the large deformation and residual stress of single-sided deposited parts. The above strategy was verified by thermal-mechanical coupling numerical simulation and corresponding experiments of single-sided and double-sided deposition of single-pass four-layer wall parts. The result showed that double-sided deposition could effectively reduce deformation of substrate and parts,improve the residual stress distribution of wall parts,which could verify the effectiveness of the proposed strategy. The conclusion in this paper could provide theoretical basis and reference for the parallel control of“shape and performance”in WAAM.