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Research on the Detection Model and Method for Evaluating Spot Welding Quality Based on Ultrasonic A-Scan Analysis

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Abstract

To establish a system which can judge the spot welding quality automatically and effectively, the mathematical and acoustic simulation models of the spot welds detection through ultrasonic A-scan are established. The following results can be obtained: (1) The quantitative relationship between nugget diameter and detecting oscillogram is deduced and verified by simulation and experiments, and then the nugget diameter mathematic model is developed. (2) The attenuation characteristic of ultrasonic waves in spot welds is studied. It shows that ultrasonic attenuation is caused by two reasons: one is absorptive and scattering effect determined by base metal, the other is the multiple reflection and transmission effect caused by the sheet-structure. And their contribution varies in different welds (no weld, undersize weld and good weld). (3) The assessment software of spot welding quality is developed, the weld nugget diameter, attenuation coefficient and spot welding quality can be obtained within a short time. In addition, the whole detecting process and system is designed. The research results of this paper indicate the feasibility of applying this spot welding quality detecting method to the automatic production line.

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Acknowledgments

This work was supported by the National 863 Program (No. 2013AA040201), the Innovative Research Team Development Program of Ministry of Education of China (No. IRT13087), the Science and Technology Support Program of Hubei province (No. 2015BCE083) and the Fundamental Research Funds for the Central Universities (No. 2013-II-007).

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Authors and Affiliations

  1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, 430070, China

    Yuke Song, Lin Hua, Xiaokai Wang, Bin Wang & Yali Liu

  2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan, 430070, China

    Lin Hua

  3. School of Automotive Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Yuke Song, Bin Wang & Yali Liu

  4. College of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Xiaokai Wang

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  1. Yuke Song
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  2. Lin Hua
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  3. Xiaokai Wang
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  4. Bin Wang
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  5. Yali Liu
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Correspondence to Xiaokai Wang.

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Song, Y., Hua, L., Wang, X. et al. Research on the Detection Model and Method for Evaluating Spot Welding Quality Based on Ultrasonic A-Scan Analysis. J Nondestruct Eval 35, 4 (2016). https://doi.org/10.1007/s10921-015-0319-3

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  • DOI: https://doi.org/10.1007/s10921-015-0319-3

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