With the rapid development of aerospace and weaponry

high efficiency and low cost manufacturing for large

integrated and high–performance metal component is in imperious demand. Wire and arc additive manufacturing (WAAM) is a kind of digital manufacturing technology with great potential to the industry. Compared to laser and electron beam additive manufacture

WAAM has many advantages

such as high material utilization

high deposition efficiency and low equipment cost. This paper provides an overview of researches of WAAM on macro forming accuracy

microstructure and mechanical properties of metal components

meanwhile

the main encounting problems of WAAM are also put forward. In order to solve these problems

the WAAM and its hybrid manufacturing technologies are reviewed

including ultrasonic peening or laser peening

cold rolling and hot rolling process

high–frequency micro–forging and post–treatment process. Finally

the key technologies to be solved of WAAM and its hybrid manufacturing are summarized.