Research status and quality improvement of wire arc additive manufacturing of metals
(1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. School of Aerospace, Transport and Manufacturing, Cranfield University, MK43 0AL, United Kingdom;
3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;
4. No. 29 Research Institute of CETC, Chengdu 610036, China;
5. Light Alloy Research Institute, Central South University, Changsha 410083, China;
6. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China;
7. School of Mechanical Engineering Nanjing University of Science and Technology, Nanjing 210094, China)
2. School of Aerospace, Transport and Manufacturing, Cranfield University, MK43 0AL, United Kingdom;
3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;
4. No. 29 Research Institute of CETC, Chengdu 610036, China;
5. Light Alloy Research Institute, Central South University, Changsha 410083, China;
6. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China;
7. School of Mechanical Engineering Nanjing University of Science and Technology, Nanjing 210094, China)
Abstract: Wire arc additive manufacturing (WAAM) is a kind of additive manufacturing technology with excellent development potential in recent years. This work aims to summarize the current research status and challenges in WAAM and provide quality improvement methods. The research status of WAAM in surface finish and forming accuracy, microstructure and mechanical properties, residual stress and deformation, porosity and other defects is given. The methods of eliminating the above shortcomings and improving the microstructure and mechanical properties are summarized from pre-processing, on-line processing and post-processing perspectives. It is concluded that there are still many challenges to the widespread adoption of WAAM, and various perspectives may be needed to achieve this. The development of path planning and slicing algorithm, the combination of online monitoring systems with existing WAAM equipment, and composite post-processing technology will be the key research directions in the future.
Key words: wire arc additive manufacturing; material property improvement; process parameter control; in-process monitoring; post-treatment