Progress on hybrid process of wire arc additive manufacturing and surface plastic forming

Wire arc additive manufacturing (WAAM) has received wide attention because of its high deposition efficiency, reduced material waste and low equipment cost. However, WAAM process often generates defects due to its intrinsic characteristics. The integration of additive manufacturing and surface strengthening techniques is an effective solution. To control the non-uniform microstructures, internal defects and residual stresses in the components, achieving three-dimensional strengthening by surface enhancement layer by layer during the additive manufacturing process. This paper reviews the recent research status of hybrid manufacturing processes involving WAAM and surface enhancement techniques, with focus on the potential of laser shock peening, a non-contact surface strengthening process, within these hybrid manufacturing processes. Finally, the paper discusses the challenges and future trends of composite manufacturing processes from the perspective of theoretical development, equipment innovation and online control.