Spatial positioning method for defects in lap joint welding piece
A technology of lap joint and spatial positioning, which is applied in the direction of material analysis using radiation, can solve the problems of difficult operation, large measurement error, defect positioning accuracy, etc., and achieves broad engineering application prospects, expansion of joint types, and strong adaptability. Effect
Inactive Publication Date: 2019-07-09
XUZHOU UNIV OF TECH
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[0002] The spatial positioning of defects in existing welding structures generally uses the translational parallax method and the double exposure method with the help of lead marking points. However, the above methods not only need to accurately measure the movement of the workpiece relative to the position of the radiation source, but also need to measure The distance between the defect and the image of the marked point is difficult to operate, the measurement error is large, and the error transmission is also large, which leads to a certain impact on the positioning accuracy of the defect in the weldment, and only the depth positioning of a single defect in the weldment can be realized. In-depth positioning of internal batch defects, and computer processing and automatic extraction of defect spatial position data cannot be realized
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[0039] Below in conjunction with embodiment the present invention is further described.
[0040] A method for spatial positioning of defects in lap joint weldments, the method can realize spatial positioning of defects in lap joint weldments, comprising the following steps:
[0041] 1) Rotate the lap joint weldment left and right to obtain the left and right rotation image of X-ray detection;
[0042] 2) Create a mathematical model of defect depth and offset with the help of the geometric relationship between the parts in the detected left-right rotation image;
[0043] 3) Determine the defect offset in the lap joint weldment according to the above model x and defect depth h ;
[0044] 4) Finally, the distribution of defects along the length of the weld is determined by defect segmentation and refinement, which enables spatial localization of defects.
[0045] Further, in the step 2), the thinnest part of the ray penetration weldment is selected as the positioning feature ...
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The invention discloses a spatial positioning method for defects in a lap joint welding piece, and belongs to the technical field of welding piece detection. The spatial positioning method for the defects in the lap joint welding piece comprises the following steps: rotating the lap joint welding piece left and right to obtain an image rotating left and right detected by X-ray; and creating a mathematical model of defect depth and offset by detecting a geometric relationship between various parts in the image. The distribution of the defects along the length direction of a welding seam can bedetermined through defect segmentation and refinement, thereby achieving spatial positioning of the defects.
Description
technical field [0001] The invention relates to a spatial positioning method for weldment defects, belonging to the technical field of weldment detection. Background technique [0002] The spatial positioning of defects in existing welding structures generally uses the translational parallax method and the double exposure method with the help of lead marking points. However, the above methods not only need to accurately measure the movement of the workpiece relative to the position of the radiation source, but also need to measure The distance between the defect and the image of the marked point is difficult to operate, the measurement error is large, and the error transmission is also large, which leads to a certain impact on the positioning accuracy of the defect in the weldment, and only the depth positioning of a single defect in the weldment can be realized. In-depth positioning of internal batch defects, and computer processing and automatic extraction of defect spatia...
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IPC IPC(8): G01N23/04
CPCG01N23/04
Inventor 吴三孩石端虎赵洪枫历长云许磊杨峰何敏
Owner XUZHOU UNIV OF TECH