中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 21 No. 2 February 2011 |
（1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education)
Shandong University, Ji’nan 250061, China;
2. Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, China）
Abstract:In order to obtain good welding quality, it is necessary to apply quality control because there are many influencing factors in laser welding process. The key to realize welding quality control is to obtain the quality information. Abundant weld quality information is contained in weld pool and keyhole. Aiming at Nd:YAG laser welding of stainless steel, a coaxial visual sensing system was constructed. The images of weld pool and keyhole were obtained. Based on the gray character of weld pool and keyhole in images, an image processing algorithm was designed. The search start point and search criteria of weld pool and keyhole edge were determined respectively.
Key words: laser welding; keyhole; weld pool; edge; image processing algorithm
