航空发动机小直径管焊缝微焦点X射线DR检测工艺参数优化方法

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doi：10.11835/j.issn.1000-582X.2026.03.007

中图分类号：TH89 文献标志码：A 文章编号：1000-582X（2026）03-071-13

Process parameter optimization for microfocus X-Ray digital radio-graphy inspection of small-diameter aero-engine tube welds

ZHANG Tao 1a，1b ，MA Long²，YUAN Weila，b，ZHOU Xinla，1b，LIU Fenglinla，1b （la.KeyLaboratory of Optoelectronic Technology and Systems，Ministry ofEducation;1b.Engineering Research Center of Industrial Computed Tomography Nondestructive Testing， Ministry of Education， Chongqing University， Chongqing 400044，P.R. China; 2. AECC Aviation Power Co.Ltd.， Xi'an 710000，P.R. China）

Abstract： Microfocus X-ray digital radiography （DR）offers high image resolution and is therefore well suited for the nondestructive inspection of smal-iameter aero-engine tube welds.To optimize the inspection process parameters for microfocus DR applied to small-diameter aero-engine tube welds，a numerical model describing the relationship between process parameters and DR image quality was developed to guide parameter selection. First，astep wedge made of the same material as the aero-engine smal-iameter tubes was used to simulate different X-ray penetration thicknesses of the workpiece.A quadratic regression model was then established to characterize the relationships between key process parameters （tube voltage，tube current，magnification，and penetration thickness，etc.）and DR image quality indexes （spatial resolution and contrast-to-noise ratio）.Then， three small-diameter aero-engine tubes with diferent wallthicknesses were selected as representative workpieces， and the optimal sequence of process parameters was determined using a non-dominated genetic algorithm. Experimental results show that the measured DR image quality indices closely match the predicted values of the model，demonstrating that the proposed quadratic regression model caneffectively predict therelationship between processparameters and DR image quality. Compared with conventional methods that adjust process parameters individually，the proposed method exhibits higher efficiency and stronger guidance and can be extended to similar DR inspection applications.

Keywords： digital radiography；contrast-to-noise ratio; spatial resolution;response surface regression methods; small-diameter aero-engine tubes;process parameters

国家"十四五"规划提出，规模以上制造业企业大部分实现数字化网络化，重点行业骨干企业初步应用智能化。（剩余12555字）