汽车起重机结构件焊接缺陷破坏过程的声发射检测  

The Application of Acoustic Emission Technology in the Welding Fault Tesing of the Truck Crane's Structure

作　　者：窦艳涛[1,2] 庞思勤[2] 徐小力[2,3] 王伟[4] 

机构地区：[1]北京石油化工学院机械工程学院,北京100081 [2]北京理工大学机械与车辆学院,北京102617 [3]北京信息科技大学机电系统测控北京市重点实验室,北京100192 [4]中国农业大学工学院,北京100083

出　　处：《无损检测》2013年第6期32-36,共5页Nondestructive Testing

基　　金：国家重点高技术研究发展计划资助项目863(2008AA042803);国家重大专项基金资助项目(2009ZX04014)

摘　　要：由于汽车起重机存在典型焊接缺陷声发射信号获取困难,缺陷识别方法不成熟等诸多问题,因此通过添加附属焊接缺陷试块的方式模拟了关键结构件局部焊缝的破坏过程,获取了该破坏过程的典型声发射数据样本,对信号衰减进行了测试,并结合声发射特征参数及频谱特征分析方法对典型声发射源进行了分析。结果表明:采用上述方式后,声发射技术能够实现焊接缺陷源的准确定位;持续时间、频率质心及峰值频率等特征,指标能够对损伤源与噪声源进行准确划分。Structural welding defects are vital safety hidden troubles to the crane, and acoustic emission（AE） technology can be used to monitor the defect changing process. Because of the complex and changeable application conditions for the truck crane, it is difficult to obtain the real AE signals of welding defect and the recognizing methods are not mature. Through adding ancillary testing specimens with welding defects to the principal structure, the breakage process in welded seam of structure was simulated, and the typical AE data during damage process were collected. The signal attenuation was tested, and in combination with characteristic parameter analysis methods and spectral characteristic analysis methods, the typical AE signals were analyzed. The result shows that AE technology can be used well for the accurate positioning of welding defects; and some characteristic parameters such as duration time, frequency centroid and peak frequency can be used to classify the defect signals and the noise.

关 键 词：汽车起重机 结构件 焊接缺陷 声发射检测 

分 类 号：TG115.28[金属学及工艺—物理冶金]