薄壁管环焊缝水浸超声衍射时差检测技术
Ultrasonic Immersion-TOFD Detecting Technology Applied in Girthed Welds of Thin Walled Pipes
摘 要
将超声水浸法和TOFD(超声衍射时差)法相结合的技术,应用于检测壁厚为9 mm的管环焊缝.使用超声波仿真软件Wave3000对薄壁管环焊缝进行水浸TOFD检测的数值模拟,显示波源发射的纵波经水-钢界面折射后继续沿着界面的下表面传播,部分副瓣折射回水中被接收探头接收,检测时可将这个波称作水浸TOFD检测的直通波.再以新的直通波和底面回波为基准,对管环焊缝进行水浸TOFD实际检测.利用此方法,在对薄壁管环焊缝的实际检测中,达到了很好的检测精度,其绝对误差不超过0.2 μs.
薄壁管环焊缝
数值模拟
新直通波
绝对误差
Immersion TOFD
Low thickness pipe girthed weld
Simulation
New lateral wave
Absolute error
Abstract
This paper combines ultrasonic immersion method and TOFD technology,and applies it in the detection of 9 mm wall thickness pipe ring weld.First of all,the numerical simulation of immersion TOFD (I-TOFD) detection for thin walled pipe girthed weld numerical modeling was performed by finite element method using ultrasonic simulation software Wave 3000.The simulation shows that the longitudinal wave inspired by source after refraction in water-steel interface,continues to spread along under the surface of water-steel interface,and part of the side lobe goes back to the water again and is to be received by the receiving probe.We call the wave as the lateral wave of I-TOFD.Then,the new lateral wave and the bottom echo can be used as reference in actual detection,and the detection accuracy is very good and absolute error is less than 0.2 μs.
中图分类号 TG115.28 DOI 10.11973/wsjc201509003
所属栏目 科研成果与学术交流
基金项目 国家自然科学基金资助项目(51265044);江西省自然科学基金资助项目(20114BAB202008)
收稿日期 2015/1/15
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备注付悦(1991-),女,助教,研究方向为超声TOFD无损检测技术.
引用该论文: FU Yue,LU Chao,CHEN Guo,WANG Chan. Ultrasonic Immersion-TOFD Detecting Technology Applied in Girthed Welds of Thin Walled Pipes[J]. Nondestructive Testing, 2015, 37(9): 11～14
付悦,卢超,陈果,王婵. 薄壁管环焊缝水浸超声衍射时差检测技术[J]. 无损检测, 2015, 37(9): 11～14
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参考文献
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【4】迟大钊,刚铁,姚英学.一种基于超声TOFD法的近表面缺陷检测模式[J].焊接学报,2011,32(2):25-28.
【5】SAJU R S,ABRAHAM T,VENKATRAMAN B.Immersion and TOFD (I-TOFD):a novel combination for examination of lower thickness[J].J Nondestruct Eval,2011,30:137-142.
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