Wei Angang, Chang Baohua, Xue Boce, Peng Guodong, Du Dong, Han Zandong
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China.
Sensors (Basel). 2019 Jul 20;19(14):3198. doi: 10.3390/s19143198.
Web-core sandwich panels are a typical lightweight structure utilized in a variety of fields, such as naval, aviation, aerospace, etc. Welding is considered as an effective process to join the face panel to the core panel from the face panel side. However, it is difficult to locate the joint position (i.e., the position of core panel) due to the shielding of the face panel. This paper studies a weld position detection method based on X-ray from the face panel side for aluminum web-core sandwich panels used in aviation and naval structures. First, an experimental system was designed for weld position detection, able to quickly acquire the X-ray intensity signal backscattered by the specimen. An effective signal processing method was developed to accurately extract the characteristic value of X-ray intensity signals representing the center of the joint. Secondly, an analytical model was established to calculate and optimize the detection parameters required for detection of the weld position of a given specimen by analyzing the relationship between the backscattered X-ray intensity signal detected by the detector and the parameters of the detection system and specimen during the detection process. Finally, several experiments were carried out on a 6061 aluminum alloy specimen with a thickness of 3 mm. The experimental results demonstrate that the maximum absolute error of the detection was 0.340 mm, which is sufficiently accurate for locating the position of the joint. This paper aims to provide the technical basis for the automatic tracking of weld joints from the face panel side, required for the high-reliability manufacturing of curved sandwich structures.
腹板-芯材夹芯板是一种典型的轻质结构，应用于海军、航空、航天等多个领域。焊接被认为是从面板侧将面板与芯板连接的有效工艺。然而，由于面板的遮挡，难以确定接头位置（即芯板的位置）。本文研究了一种基于X射线从面板侧检测航空和海军结构中使用的铝制腹板-芯材夹芯板焊接位置的方法。首先，设计了一个用于焊接位置检测的实验系统，能够快速采集被试件反向散射的X射线强度信号。开发了一种有效的信号处理方法，以准确提取代表接头中心的X射线强度信号的特征值。其次，通过分析检测过程中探测器检测到的反向散射X射线强度信号与检测系统和试件参数之间的关系，建立了一个分析模型，用于计算和优化检测给定试件焊接位置所需的检测参数。最后，对厚度为3mm的6061铝合金试件进行了多次实验。实验结果表明，检测的最大绝对误差为0.340mm，对于确定接头位置来说足够精确。本文旨在为曲面夹芯结构高可靠性制造所需的从面板侧自动跟踪焊接接头提供技术依据。
