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《Electric Welding Machine》 2019-08
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Three-dimensional contour visual characterization of multi-layer multi-pass welds based on grid structure light

ZHANG Pengxian;YU Tong;FANG Zhizhong;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology;Key Laboratory of Nonferrous Metal alloys and Processing,Ministry of Education,Lanzhou University of Technology;  
A visual measurement method is proposed,which is the three-dimensional contour of the groove and weld surface based on the grid structure light. A visual measurement system is built with cameras,lasers,and adjustment mechanisms as core. The grid stripe visual images are collected from the weld profiles of submerged arc plate surfacing and groove butt joint. And the correlative relationship between the contour geometry change and the grid stripe distortion characteristic is analyzed. The coordinates of the grid nodes are extracted by using algorithms, such as window opening, threshold segmentation,refinement and grid cross. Three methods of surface reconstruction are tried based on the node point cloud data. The actual verification results show that it is feasible to obtain the digital contour of the weld surface based on the coordinates of the visual measurement grid nodes.
【CateGory Index】: TG445;TP391.41
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