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GAO Xiangdong, HUANG Guanxiong, XIAO Zhenlin, CHEN Xiaohui. Micro weld detection based on magneto-optical lmaging and wavelet multi-scale fusion[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(4): 1-4.
Citation: GAO Xiangdong, HUANG Guanxiong, XIAO Zhenlin, CHEN Xiaohui. Micro weld detection based on magneto-optical lmaging and wavelet multi-scale fusion[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(4): 1-4.
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Micro weld detection based on magneto-optical lmaging and wavelet multi-scale fusion

  • 1.

    School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

  • 2.

    Guangzhou Panyu Gofront Dyeing & Finishing Machinery Manufacturer Ltd., Guangzhou 511400, China

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  • Received Date: October 09, 2014
    Graphical Abstract
    • Abstract
  • For micro-gap weld joint whose width is less than 0.1 mm, the weldments are magnetized by using an excitation magnetic field. Meanwhile, a magneto optical sensor based on the principle of Faraday magneto effect is applied to acquire the magneto optical images of weld joint. An edge detection method which fuses the wavelet multi-scale information of image is developed to deal with the magneto optical images of weld joint. Three layers wavelet decomposition of the weld magneto optical image is used to obtain wavelet image which contains high frequency information of weld edge. And then it fuses all high frequency images according to the richness of details which contain the high frequency information of each scale. By using wavelet modulus local maxima to detect the edge of fused image, the smooth weld edge with good noise immunity and continuity is obtained. The result of seam tracking test shows that the proposed method is an effective way to extract weld edge and is suitable for the image processing in micro-gap seam tracking based on magneto-optical imaging sensing.
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    • References (6)
  • Gao Xiangdong, Zhong Xungao, You Deyong, et al. Kalman filtering compensated by radial basis function neural network for seam tracking of laser welding[J]. IEEE Transactions on Control Systems Technology, 2013, 21(5):1916-1923.
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