Abstract
An ultrasonic vortex C-Scan technique has been proposed to inspect stainless steel resistance spot welding (RSW) joints. Wavelet decomposition method is applied to analyze the original A-Scan data. By combination of semisoft threshold constructor and ultrasonic power ratio arithmetic (UPRA), the effect of corona bond is eliminated effectively, and its boundary is abstracted legibly. The nugget diameter measurement error is reduced from 2, approximately, to 0.19 mm. The fitted curve, nugget diameter and tensile strength, can be used to predict maximum tensile strength of joints online without destructive experiment. Shrinkage voids flaws located in the middle of the nugget have little influence on tensile strength.
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Funding
This work was supported by the National Natural Science Foundation of China under Grant 51605468, Grant 31702393, and Grant 32073028; in part by the Ningbo Public Welfare Key Project under Grant 2019C10098 and Grant 2019B10079; and in part by the Natural Science Foundation of Ningbo under Grant 2019A610092; and in part by the Natural Science Foundation of Liaoning Province under Grant 2019-MS-334.
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Bo Zhang and Weiming Cai conceived and designed the experiments; Baojun Zhang and Yitao Zhang performed the experiments; Lang Wang were in charge of the results testing.
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Zhang, B., Zhang, B., Cai, W. et al. A novel method to eliminate the corona bond effect in detecting resistance spot welding joints based on ultrasonic vortex C-Scan technique. Int J Adv Manuf Technol 117, 3241–3252 (2021). https://doi.org/10.1007/s00170-021-07875-w
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DOI: https://doi.org/10.1007/s00170-021-07875-w