基于激光超声的铝合金搅拌摩擦焊典型缺陷检测及分析

发布时间：2018-02-01 03:07

本文关键词： 搅拌摩擦焊激光超声功率谱支持向量机　出处：《焊接学报》2015年07期 　论文类型：期刊论文

【摘要】：利用不同搅拌摩擦焊(FSW)工艺参数获得2219铝合金薄板根部未焊合、隧道孔两种典型缺陷,对比X射线检测结果,采用激光超声对这两种典型FSW缺陷进行检测.从时域上对采样信号峰值点及幅值进行分析,并进一步运用PSD-welch功率谱法进行频域分析,提取频域不同频段的能量,结合时域最大幅值作为特征,利用支持向量机建模并训练,识别率达到85%.结果表明,基于激光超声检测的时、频域特征能够有效对铝合金FSW两种典型缺陷进行分类识别,从而为铝合金FSW缺陷检测提供一种技术途径.
[Abstract]:Two typical defects of 2219 aluminum alloy sheet were obtained by using different friction stir welding (FSW) process parameters. The results were compared with the results of X-ray examination. The two typical FSW defects are detected by laser ultrasound. The peak points and amplitudes of the sampled signals are analyzed from the time domain, and the frequency domain analysis is carried out by using the PSD-welch power spectrum method. The energy of different frequency bands in frequency domain is extracted, combined with the maximum value of time domain as the feature, the support vector machine is used to model and train, the recognition rate reaches 85%. The results show that the time based on laser ultrasonic detection. Frequency domain features can effectively identify two typical defects of aluminum alloy FSW, thus providing a technical approach for aluminum alloy FSW defect detection.
【作者单位】：上海交通大学材料科学与工程学院;上海市特种设备监督检验技术研究院;
【基金】：国家自然科学基金资助项目(51005153) 上海市启明星资助项目(11QB1405300)
【分类号】：TG441.7
【正文快照】： 0序言搅拌摩擦焊(friction stir welding,FSW)是1991年英国焊接研究所提出的一种固态连接方法,它具有焊接过程简单,焊件力学性能好等优点,应用于同种金属以及异种金属的焊接.铝合金较活泼,表面易氧化,线膨胀系数大.相比较传统焊接方法,搅拌摩擦焊能够有效地避免气孔、裂纹等缺

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