基于超声波法的紫铜焊接结构缺陷检测  

Defect detection for red copper weldment using ultrasonic method

作　　者：迟大钊[1,2] 刚铁[1] 姚英学[2] 袁媛[1] 

机构地区：[1]哈尔滨工业大学现代焊接生产技术国家重点实验室,哈尔滨150001 [2]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《焊接学报》2010年第5期21-24,共4页Transactions of The China Welding Institution

基　　金：政府间合作项目(2007DFR70070);国家自然科学基金资助项目(50775054);中国博士后科学基金资助项目(20080440873)

摘　　要：针对常规的超声反射波法检测结果记录性差、可靠性低等技术缺点,采用超声衍射时差(time of flight diffraction,TOFD)法对厚壁(≥20mm)紫铜焊缝缺陷进行检测研究.通过对紫铜材料声学特性的分析,为超声波换能器的选取提供了依据;通过人工缺陷检测,测试了系统的检测灵敏度及精度,并确定了能更全面地反映焊缝中缺陷分布情况的检测工艺;采用超声TOFD法对紫铜焊缝进行了检测,并通过破坏性试验对无损检测结果进行了验证.结果表明,通过采用合理的检测工艺,超声TOFD法能够有效识别紫铜焊缝中裂纹类危险性缺陷.Because the traditional ultrasonic test tech-nique has some shortcomings such as unreliability and poor re-cording,the ultrasonic TOFD(Time of Flight Diffraction)is em-ployed to detect defect of a thick wall(≥20 mm)red copper weldment.The analysis of the acoustic character of red copper provides a guideline for choosing of ultrasonic transducer.The sensitivity and accuracy of the system was tested and the test process was designed through testing an artificial defects con-tained block.Ultrasonic TOFD was carried on red copper weld-ment,and the non-destructive test results were verified by de-structive testing experiments.The results show that,ultrasonic TOFD is effective in recognition of the dangerous weld cracks with proper test process.

关 键 词：超声TOFD 紫铜焊缝 缺陷检测 

分 类 号：TG115.28[金属学及工艺—物理冶金]