焊接缺陷高频显微超声可视化扫查检测  

Weld defects tested by high frequency ultrasound visual scanning system

作　　者：路浩[1] 邢立伟[1] 赵新玉[2] 

机构地区：[1]南车青岛四方机车车辆股份有限公司,266111 [2]大连交通大学,116028

出　　处：《焊接》2014年第9期19-23,28,共6页Welding & Joining

基　　金：国家自然科学基金资助项目(51105033);四方股份工艺开发资助项目(2012001)

摘　　要：目前普遍使用的超声检测方法主要依据超声脉冲信号判断结构内部有无缺陷,难以对缺陷进行定性和定量检测。开发了高频超声成像技术,可进行超声A信号、B扫描和C扫描图像联动显示,缺陷标识和定量分析;研发建立了高频超声扫查系统平台,实现了高精度机械扫查、高频超声收发、全波数据高速采集和成像。用该系统对弧焊、激光焊、搅拌摩擦焊等焊接构件进行检测试验,与射线检测、金相检测进行对比,结果表明:该系统可直观发现焊缝气孔等微小缺陷,能够发现射线难以检测的未熔合缺陷,也可对缺陷埋藏深度进行准确定量分析。The traditional ultrasonic testing technology seems a lack of ability in distinguishing and sizing the defects according to the simple A-scan signal.In order to overcome this difficulty,the high frequency ultrasound inspection system was developed for weldment.A high frequency ultrasonic imaging technology is developed to display the A signal,B and C scan images together,and identify and size these defects according to the scanning images.Also an ultrasonic inspection system with high precision mechanical scanning and high speed data acquisition is established.Using this ultrasonic system,the inspection results are obtained for those components with arc welding,laser welding and friction stir welding method,and compared with both X-ray testing images and metallographie examinations,it is shown that the high-frequency ultrasonic technology can find the porosity and lack fusion defects quantitatively,and determine the defect depth accurately.

关 键 词：高频超声 可视化 焊接缺陷 

分 类 号：TG115.28[金属学及工艺—物理冶金]