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WU Gang, GUAN Shanyue, WANG Xiaokai, WANG Bin. Feature analysis and defect recognition of ultrasonic detection signal for spot welding of sheet[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(4): 112-118. DOI: 10.12073/j.hjxb.2019400110
Citation: WU Gang, GUAN Shanyue, WANG Xiaokai, WANG Bin. Feature analysis and defect recognition of ultrasonic detection signal for spot welding of sheet[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(4): 112-118. DOI: 10.12073/j.hjxb.2019400110
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Feature analysis and defect recognition of ultrasonic detection signal for spot welding of sheet

  • 1. College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, China;

  • 2. Hubei Key Laboratory of Modern Automotive Components and Technology, Wuhan University of Technology, Wuhan 430070, China;

  • 3. Hubei Collaborative Innovation Center for Automotive Components and Technology, Wuhan 430070, China

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  • Received Date: August 08, 2017
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    • Abstract
  • Based on the finite element simulation models of spot welding ultrasonic detection for low carbon steel and Fast Fourier Transform, the frequency spectrums of four kinds of simulated signals, such as pore, deep indentation, small nugget, loose weld, were obtained. And the time domain and frequency domain features of signals were extracted respectively by statistical methods. By analyzing the propagation rules of ultrasonic in different defect spot welds and the change rules of features, the recognition methods of different defects types of spot welding were summarized. The method was used to identify the defects of a large number of spot welding samples by ultrasonic testing signals, and the results were compared with the metallographic test results. The results showed that the time domain and frequency domain features of ultrasonic detection signals were effectively recognized the types of spot welding defects.
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