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An automated weld seam tracking system for thick plate using cross mark structured light

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Abstract

This paper presents a weld seam tracking system using cross mark structured light. The hardware of the proposed system consists of a two degrees of freedom (DOF) welding robot, a camera with cross mark structured light, and two computers. The system has two parts namely visual sensing and motion control. In the visual sensing part, the cross mark of the structured light is utilized to set a region of interest (ROI). In the ROI, an adapted line fitting algorithm is employed to estimate the lines. Then, intersections of the lines are computed and used as the pin points for templates creating. During the matching process, a modified template matching is used to detect the edges of V-groove weld seam. By using this technique, a huge computational cost in image processing can be reduced, and therefore the tracking can be made in real time. The position based visual servoing with proportional-derivative(PD) and velocity feedback controller is designed for seam tracking. The experimental results show that the proposed method performs the real-time tracking efficiently with sufficient accuracy.

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Authors and Affiliations

  1. The State Key Laboratory of Management and Control for Complex Systems, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China

    Prasarn Kiddee, Zaojun Fang & Min Tan

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  1. Prasarn Kiddee
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  2. Zaojun Fang
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  3. Min Tan
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Corresponding author

Correspondence to Prasarn Kiddee.

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Kiddee, P., Fang, Z. & Tan, M. An automated weld seam tracking system for thick plate using cross mark structured light. Int J Adv Manuf Technol 87, 3589–3603 (2016). https://doi.org/10.1007/s00170-016-8729-7

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  • DOI: https://doi.org/10.1007/s00170-016-8729-7

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