Phased array ultrasonic testing method of nugget diameter for resistance spot welding
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摘要: 为解决使用现有超声检测系统评估电阻点焊熔核直径误差较大的问题，基于相控阵超声探头与特征信号分析技术，提出了一种点焊熔核直径定量化检测方法，重点研究了表面压痕对单阵元超声信号的影响规律，揭示了基于阵元超声信号的熔核边缘识别方法，并试验验证了熔核直径评估方法的精度。试验结果表明，点焊熔核直径的相控阵超声检测结果与金相检验结果具有较高的一致性，相控阵超声定量化检测方法可靠，且精度较高。Abstract: The existing ultrasonic testing system has a large error in evaluating the nugget diameter of resistance spot welding joints. In order to solve this problem,the quantitative testing method of nugget diameter for spot welding was proposed, which was based on phased array ultrasonic probe and characteristic signal analysis technology. The influence law of surface indentation on the single array ultrasonic signal was emphatically studied. The edge identification method of nugget based on array ultrasonic signal was revealed. Then the accuracy of testing method of nugget diameter was experimentally verified. The results show that results of the spot welding nugget diameter obtained by ultrasonic testing were highly consistent with that of metallographic measurement results,which is highly reliable and accurate.
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