Wire and arc additive manufacturing（WAAM） is a technology for the rapid forming of large-scale metal components with complex structures

which has the advantages of low equipment cost

high material utilization and high deposition efficiency. On this basis

the current research status of WAAM equipment

materials and processes was highlighted combined with the hot topics of forming accuracy

microstructure characteristics and mechanical properties of metallic components. Finally

the key technologies that need to be solved for WAAM were summarized and the development direction of WAAM was prospected.