Defect detection of laser welding seam of unequal-thickness blank based on structured light vision
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1.
Guangzhou Institute for Non-Ferrous Metal Research, Guangzhou 510650, China;
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2.
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
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Corresponding author:
GAO Shi-yi, shiyigao@gmail.com
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Received Date:
2010-12-03
Accepted Date:
2011-02-25
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Abstract
In order to detect the laser welding seam surface defects of unequal-thickness steel blank,the structured light active vision method and Gaussian data fitting technology were used for the experiment research of the seam surface defects detection.Firstly,the laser strip center line in sub-pixel accuracy was extracted by Gaussian fitting.Secondly,the seam endpoint positions were obtained by line fitting and computing point of intersections of three lines.Thirdly,the computing methods of the surface defects of the laser welding seam,such as concavity,convexity,were put forward.The experiment result shows that the proposed method is based on structured light vision and data fitting is suit for laser welding seam detection of unequal-thickness steel blanks.
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