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Robust vision-based...
Robust vision-based joint tracking for laser welding of curved closed-square-butt joints
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- Nilsen, Morgan (author)
- Högskolan Väst,Avdelningen för produktionssystem (PS),PTW
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- Sikström, Fredrik, 1971- (author)
- Högskolan Väst,Avdelningen för produktionssystem (PS),PTW
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- Christiansson, Anna-Karin, 1947- (author)
- Högskolan Väst,Avdelningen för produktionssystem (PS),PTW
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- Ancona, Antonio, 1974- (author)
- Högskolan Väst,Avdelningen för produktionssystem (PS),Physics Department, IFN-CNR Institute for Photonics and Nanotechnologies, Bari, Italy,PTW
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(creator_code:org_t)
- 2018-11-27
- 2019
- English.
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In: The International Journal of Advanced Manufacturing Technology. - : Springer Science and Business Media LLC. - 0268-3768 .- 1433-3015. ; 101:5-8, s. 1967-1978
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Abstract
Subject headings
Close
- Robotized laser beam welding of closed-square-butt joints is sensitive to how the focused laser beam is positioned in relation to the joint, and existing joint tracking systems tend to fail in detecting the joint when the gap and misalignment between the work pieces are close to zero. A camera-based system is presented based on a high dynamic range camera operating with LED illumination at a specific wavelength and a matching optical filter. An image processing algorithm based on the Hough transform extracts the joint position from the camera images, and the joint position is then estimated using a Kalman filter. The filter handles situations, when the joint is not detectable in the image, e.g., when tack welds cover the joint. Surface scratches, which can be misinterpreted as being the joint, are handled by a joint curve prediction model based on known information about the nominal path defined by the robot program. The performance of the proposed system has been evaluated off line with image data obtained during several welding experiments.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
Keyword
- Laser beam welding
- Joint tracking
- Butt joints
- Camera
- Hough transform
- Kalman filter
- Manufacturing and materials engineering
- Produktions- och materialteknik
Publication and Content Type
- ref (subject category)
- art (subject category)
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