Multi-pass groove profile detection for spherical tank welding based on QUASI

DOUBLE CAMERAS STEREOVISION SENSOR

Wang Junbo

(State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100080)

Chen Qiang  Sun Zhenguo

(Department of Mechanical Engineering, Tsinghua University, Beijing 100084)

Abstract: Filling of weld groove is a very important gist for welding parameters programming and regulating during longitude seam welding of spherical tank. According to the weld torch swing characteristic in multi-pass welding of spherical tank, a “quasi double cameras” stereovision (QDCS) sensor with a moving camera has been set up to detect the weld profile so as to avoid the conflict between public visual filled with double cameras sensors and the overlap of camera positions. Based on that, a particular algorithm has been developed to detect weld profile which could feature the filling of weld groove. The detection precision is no more than 0.5 mm, which could provide the basis for multi-pass welding control.

Key words: Quasi double cameras stereovision sensor  One moving camera  Weld profile  Detection  Multi-pass welding for spherical tank

CLC No: TP394  TP24

国家863高科技(863-512-9913-02)和国家自然科学基金(60302003)资助项目. Received 20041214, received in revised form 20050501