1. College of Zhijiang, Zhejiang University of Technology, Hangzhou, Zhejiang 310024, P. R. China
2. Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, P. R. China
3. Zhejiang Provincial Collaborative Innovation Center of High-End Laser Manufacturing Equipment, Hangzhou, Zhejiang 310014, P. R. China
4. Hangzhou Chunjiang Valve Co., Ltd., Hangzhou, Zhejiang 311500, P. R. China