爆炸焊钛—钢结合层超声特征成像检测

发布时间：2018-07-08 08:28

本文选题：钛-钢复合板爆炸焊 + 超声特征成像　；参考：《南昌航空大学》2015年硕士论文

【摘要】：为了提高爆炸焊接的焊接质量,需要对爆炸焊工件焊层处的结合情况有一个较为全面地了解。以往在对爆炸焊工件结合面处粘合质量的研究时,几乎都是通过电镜对结合面处材料的组织进行观察来判定结合情况的好坏。但这种方法虽然精确但属于破坏性检测,所以并不适用于实际工件的100%检测。本文以钛钢爆炸焊试件作为研究对象,利用超声特征成像方式测量爆炸焊件结合面处纹波间的距离和纹波的高度这两个材料参量,评价爆炸焊接质量的好坏。本论文是采用奥林巴斯公司的5077PR脉冲发射仪、PicoScope 3206B采集卡组成的超声水浸扫描检测系统,研究检测频率,研究聚焦位置对爆炸焊结合层的反射回波幅值成像效果的影响,研究钛-钢爆炸焊复合板焊接结合层的结合参数,结果表明,15MHz水浸聚焦探头,聚焦位置在焊层处检测效果最好,直接采用爆炸焊结合层的反射回波幅值成像无法精确测量纹波间距和高度,本文在比较比较希尔伯特变换、Guassian变换、频谱分析等信号处理方法之后,利用频谱分析处理回波信号,并重建结合部位的幅度分布图像,利用Image软件测量结合面处纹波间的距离,通过B扫波形中的界面波进行拉直处理后,分别选取两个点分别标识在相邻两波峰-波谷处,利用回波传播时间和声速测量纹波的高度。本文中将钛-钢爆炸焊结合面撕开,直接测量实际爆炸焊结合面的纹波宽度和高度,与超声特征扫描结果进行对比,并和射线剖面成像方式测量纹波高度结果进行对比,结果表明,本论文提出的超声特征成像检测方法检测灵敏度高,测量准确,本论文的研究成果可以直接用于无损评定钛-钢爆炸焊接质量并可以实现100%在线检测。
[Abstract]:In order to improve the welding quality of explosive welding, it is necessary to have a comprehensive understanding of the bonding of the welding layer of explosive welding workpiece. In the past, in the research of bonding quality of explosive welding workpiece, almost all of them used electron microscope to observe the structure of the material at the bonding surface to judge the quality of bonding. However, this method is accurate but destructive, so it is not suitable for 100% of the actual workpiece detection. In this paper, the ultrasonic characteristic imaging method is used to measure the distance between the ripples and the height of the ripples on the bonding surface of the explosive welds, and to evaluate the quality of the explosive welding. In this paper, the ultrasonic water immersion scanning detection system is made up of the 5077PR pulse emitter PicoScope 3206B of Olympus Company, and the frequency of detection and the effect of focusing position on the imaging effect of reflection echo amplitude of explosive welding bonding layer are studied. The bonding parameters of the bonding layer of Ti-steel explosive welding composite plate are studied. The results show that the focus position of the 15MHz water immersion focusing probe is the best in the welding layer. It is impossible to accurately measure the spacing and height of the ripple by directly using the reflection echo amplitude imaging of the explosive welding bonding layer. After comparing the signal processing methods such as Guassian transform and spectrum analysis of Hilbert transform, the echo signal is processed by spectrum analysis. The amplitude distribution image of the joint is reconstructed, and the distance between the ripples at the interface is measured by Image software. After straightening through the interface wave in the B-scan waveform, two points are selected to mark the two adjacent peaks and valleys, respectively. The height of ripple is measured by echo propagation time and sound velocity. In this paper, the bonding surface of Ti-steel explosive welding is torn apart, the ripple width and height of the actual explosive welding bonding surface are measured directly, and compared with the results of ultrasonic characteristic scanning, and compared with the results measured by ray profile imaging. The results show that the ultrasonic characteristic imaging method proposed in this paper has high detection sensitivity and accurate measurement. The research results in this paper can be directly used to evaluate the quality of Ti-steel explosive welding and to realize 100% on-line detection.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG441.7

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