| 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(≥20 mm)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. |
| 关键词: 超声TOFD 紫铜焊缝 缺陷检测 |
| DOI： |
| 分类号: |
| 基金项目: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) |
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| Defect detection for red copper weldment using ultrasonic method |
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CHI Dazhao1,2, GANG Tie1, YAO Yingxue2, YUAN Yuan1
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1.State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China;2.School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
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| Abstract: |
| 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. |
| Key words: ultrasonic TOFD red copper weldment defect detection |
