Journal
OPTICS AND LASERS IN ENGINEERING
Volume 64, Issue -, Pages 59-70Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2014.07.004
Keywords
Fiber laser keyhole welding; Coaxial monitoring; Edge detection; Weld pool width measurement
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In keyhole fiber laser welding processes, the weld pool behavior is essential to determining welding quality. To better observe and control the welding process, the accurate extraction of the weld pool boundary as well as the width is required. This work presents a weld pool edge detection technique based on an off axial green illumination laser and a coaxial image capturing system that consists of a CMOS camera and optic filters. According to the difference of image quality, a complete developed edge detection algorithm is proposed based on the local maximum gradient of greyness searching approach and linear interpolation. The extracted weld pool geometry and the width are validated by the actual welding width measurement and predictions by a numerical multi-phase model. (C) 2014 Elsevier Ltd. All rights reserved.
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