本文選題：鈦-鋼復合板爆炸焊 + 超聲特征成像�。� 參考：《南昌航空大學》2015年碩士論文

【摘要】：為了提高爆炸焊接的焊接質(zhì)量,需要對爆炸焊工件焊層處的結(jié)合情況有一個較為全面地了解。以往在對爆炸焊工件結(jié)合面處粘合質(zhì)量的研究時,幾乎都是通過電鏡對結(jié)合面處材料的組織進行觀察來判定結(jié)合情況的好壞。但這種方法雖然精確但屬于破壞性檢測,所以并不適用于實際工件的100%檢測。本文以鈦鋼爆炸焊試件作為研究對象,利用超聲特征成像方式測量爆炸焊件結(jié)合面處紋波間的距離和紋波的高度這兩個材料參量,評價爆炸焊接質(zhì)量的好壞。本論文是采用奧林巴斯公司的5077PR脈沖發(fā)射儀、PicoScope 3206B采集卡組成的超聲水浸掃描檢測系統(tǒng),研究檢測頻率,研究聚焦位置對爆炸焊結(jié)合層的反射回波幅值成像效果的影響,研究鈦-鋼爆炸焊復合板焊接結(jié)合層的結(jié)合參數(shù),結(jié)果表明,15MHz水浸聚焦探頭,聚焦位置在焊層處檢測效果最好,直接采用爆炸焊結(jié)合層的反射回波幅值成像無法精確測量紋波間距和高度,本文在比較比較希爾伯特變換、Guassian變換、頻譜分析等信號處理方法之后,利用頻譜分析處理回波信號,并重建結(jié)合部位的幅度分布圖像,利用Image軟件測量結(jié)合面處紋波間的距離,通過B掃波形中的界面波進行拉直處理后,分別選取兩個點分別標識在相鄰兩波峰-波谷處,利用回波傳播時間和聲速測量紋波的高度。本文中將鈦-鋼爆炸焊結(jié)合面撕開,直接測量實際爆炸焊結(jié)合面的紋波寬度和高度,與超聲特征掃描結(jié)果進行對比,并和射線剖面成像方式測量紋波高度結(jié)果進行對比,結(jié)果表明,本論文提出的超聲特征成像檢測方法檢測靈敏度高,測量準確,本論文的研究成果可以直接用于無損評定鈦-鋼爆炸焊接質(zhì)量并可以實現(xiàn)100%在線檢測。
[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.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG441.7

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