Research of on-line inspection of laser welding seam quality of cold rolled strips

SHENG Limin; TANG Xiahui; PENG Hao; PAN Jixing; PEI Yun; ZHU Haiyun

doi:10.7510/jgjs.issn.1001-3806.2015.04.001

LASER TECHNOLOGY > 2015 > 39(4): 437-442. > DOI: 10.7510/jgjs.issn.1001-3806.2015.04.001

SHENG Limin, TANG Xiahui, PENG Hao, PAN Jixing, PEI Yun, ZHU Haiyun. Research of on-line inspection of laser welding seam quality of cold rolled strips[J]. LASER TECHNOLOGY, 2015, 39(4): 437-442. DOI: 10.7510/jgjs.issn.1001-3806.2015.04.001

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Research of on-line inspection of laser welding seam quality of cold rolled strips

1.
National Engineering Research Center for Laser Processing, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China;
2.
Wuhan Iron and Steel Corporation, Wuhan 430074, China

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Received Date: June 02, 2014
Revised Date: July 02, 2014
Published Date: July 24, 2015

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Abstract

Abstract

On-line inspection of seam quality is one of the most important key technologies in laser welding of cold rolled strips. In order to solve the welding problems of TRUMPF12000 fast-flow axial laser welding equipment used in WISCO, such as misalignment,seam and weld morphology, three sensors were adopted to acquire image information including gap images before welding, penetration images during welding, and seam images after welding and so on. OTSU operation was used to find the threshold automatically. Projective geometry was used to convert image coordinates to workspace coordinates. Codes were written to extract image features. On-line seam quality inspection system was founded. Experiments were performed to test the inspection accuracy of 3mm thickness cold steel at weld velocity of 5m/min. The relative error of seam width was about 4.42%. The results show that the seam inspection system can offer the accurate judgment comparatively.
- laser technique,
- weld inspection,
- sensor,
- image processing,
- projective geometry

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