Journal
NONDESTRUCTIVE TESTING AND EVALUATION
Volume 38, Issue 4, Pages 598-611Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10589759.2022.2142223
Keywords
Self-piercing riveting; ultrasonic C-scan image; rivet expansion diameter; greyscale distribution
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A non-destructive technique for measuring the geometrical parameters of self-piercing riveting (SPR) joints based on ultrasonic C-scan image was proposed. By analyzing the characteristics of the ultrasonic echo signal and applying an image segmentation process, the expansion diameter of SPR was detected and correlated well with the metallographic cross section, providing a new method for SPR quality evaluation using non-destructive testing.
A non-destructive technique was proposed for geometrical parameters' measurement of self-piercing riveting (SPR) joints based on ultrasonic C-scan image. Firstly, in order to enhance the detection precision, the characteristics of the ultrasonic echo signal at the edge of internal structure were analysed, and a theoretical formula on its sound intensity distribution was established. Then, an image segmentation process for the detection of SPR expansion diameter was suggested. Results showed that taking the greyscale value at the 'inflection point' from the C-scan image as the threshold of the segmentation, the non-destructive test results can get good correlation with the metallographic cross section, which provides a new method on the quality evaluation of SPR by using non-destructive test.
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