| 基于双波的焊缝根部底面开口裂纹的超声相控阵测量 |
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| 引用本文： | 彭国平, 张在东, 刘书宏, 卢超. 基于双波的焊缝根部底面开口裂纹的超声相控阵测量[J]. 失效分析与预防, 2014, 9(5): 266-270. DOI: 10.3969/j.issn.1673-6214.2014.05.003 |
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| 作者姓名： | 彭国平 张在东 刘书宏 卢超 |
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| 作者单位： | 1.1. 广州特种承压设备检测研究院, 广州 510663 |
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| 摘 要： | 由于压力和腐蚀等原因,承压设备的大焊缝根部易出现底面开口裂纹.本研究采用超声相控阵扇扫检测技术对底面开口裂纹进行检测.基于底面开口裂纹上下尖端回波,提出采用绝对到达时间技术(Absolute Arrival Time Technique, AATT)测量其高度.制作含有不同高度的人工裂纹试块,通过模拟仿真和实验测量验证AATT法测量底面开口裂纹高度精度.实验结果表明超声相控阵AATT法能从单面单侧对缺陷进行检测测量,当裂纹高度大于3 mm时,能达到与常规TOFD相同的测量精度.同时研究了声束偏转角度对AATT测量结果的影响,结果表明基于裂纹尖端衍射波的AATT具有更高的测量精度.
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| 关 键 词： | 超声相控阵检测 AATT 裂纹高度测量 仿真 |
| 收稿时间： | 2014-07-08 |
| 修稿时间： | 2014-09-10 |
Sizing Surface-breaking Crack of Welding Bottom Using Ultrasonic Phased Array Measurement Based on Double-echo Indications |
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| PENG Guo-ping, ZHANG Zai-dong, LIU Shu-hong, LU Chao. Sizing Surface-breaking Crack of Welding Bottom Using Ultrasonic Phased Array Measurement Based on Double-echo Indications[J]. Failure Analysis and Prevention, 2014, 9(5): 266-270. DOI: 10.3969/j.issn.1673-6214.2014.05.003 |
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| Authors: | PENG Guo-ping ZHANG Zai-dong LIU Shu-hong LU Chao |
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| Affiliation: | 1.1. Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou 510663, China |
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| Abstract: | Because of corrosion and pressure and other reasons, the bottom surface-breaking crack often occurs to the big weld bead in pressure equipment. In this paper, the height of bottom surface-opening crack is measured by ultrasonic phased array technique. Base on the echo of the two pointed end of bottom surface-opening crack, the absolute arrival time technique is proposed to measure its height. The block with different height of the artificial cracks is made. The height of artificial cracks in two blocks is measured to verify the precision in test simulation and experimental measurement. The result shows that the 3 mm height of bottom break crack can be measure quantitatively by the absolute arrival time technique (AATT) from one side and can achieve the same accuracy as the conventional TOFD. The influence of beam deflection angle on AATT is also discussed in this paper. The result shows that based on the diffraction wave of crack tip, the AATT has higher measuring accuracy. |
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| Keywords: | ultrasonic phased array testing AATT crack sizing simulation |
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