1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, P. R. China
2. State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, P. R. China
3. State Key Laboratory of Robotics and Systems, Harbin Institute of Technology, Harbin, P. R. China
4. Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
5. State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, P. R. China
6. Center for Advanced Structural Materials, City University of Hong Kong Shenzhen Research Institute, Shenzhen, P. R. China