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首页> 《中国测试》期刊 >本期导读>轨道车辆铝合金焊缝埋深缺陷远场涡流检测试验研究

轨道车辆铝合金焊缝埋深缺陷远场涡流检测试验研究

140    2021-09-23

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作者:范钦磊1, 戴忠晨1, 陈菲1, 张洪逵1, 宋凯2

作者单位:1. 中车南京浦镇车辆有限公司,江苏 南京 210031;
2. 南昌航空大学 无损检测技术教育部重点实验室,江西 南昌 330063


关键词:地板;铝合金;远场涡流;埋深缺陷;检测线圈


摘要:

轨道车辆地板主要由铝合金焊接构件组成,其焊接质量直接影响构件使用寿命及可靠性。该文对铝合金地板焊缝埋深缺陷进行远场涡流检测试验研究,分析检测线圈放置方式、激励电压以及探头提离高度对缺陷检测灵敏度的影响,利用地板实际构件制作试块,研究铝合金地板焊缝埋深缺陷的检测信号特征。试验结果表明:当检测线圈轴线平行于探头检测面且平行于激励-检测线圈连线方向放置时,检测灵敏度达到最大;探头检测时激励电压为8 V,提离高度为1 mm;缺陷检测灵敏度优化后探头最佳激励频率为800 Hz,同时虽然缺陷信号随盲孔埋深的增加呈现递减趋势,但优化后探头可有效检测铝合金地板焊缝试块中直径为φ1 mm、埋深为3 mm的盲孔,表明远场涡流检测技术可有效检测轨道车辆铝合金地板焊缝埋深缺陷。


Experimental study on remote field eddy current testing for buried depth defects of aluminum alloy of rail vehicles
FAN Qinlei1, DAI Zhongchen1, CHEN Fei1, ZHANG Hongkui1, SONG Kai2
1. CRRC Nanjing Puzhen Co., Ltd., Nanjing 210031, China;
2. Key Laboratory of Nondestructive Test of Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China
Abstract: The rail vehicle floor is mainly composed of aluminum alloy welding components, and the welding quality directly affects the service life and reliability of the components. In this paper, the remote field eddy current testing test is carried out on the buried depth defect of the aluminum alloy floor weld. The influence of coil placement, excitation voltage and probe lift off height on defect detection sensitivity is analyzed. Using the actual floor components to make test blocks, and the detection signal characteristics of aluminum alloy floor weld depth defects were studied. The results showed that: When the detection coil axis is parallel to the surface of the component and parallel to the direction of the excitation-detection coil connection, the detection sensitivity reaches the maximum; The excitation voltage of the probe is 8 V and the lift-off height is 1 mm; After the optimization of defect detection sensitivity, the optimal excitation frequency of the probe is 800 Hz. At the same time, although the defect signal decreased with the increase of the buried depth of the blind hole, the optimized probe could effectively detect the blind hole with the diameter of φ1 mm and the buried depth of 3 mm in the test block of the aluminum alloy floor welding seam, it shows that the remote field eddy current detection technology can effectively detect the buried depth defect of the aluminum alloy floor of rail vehicles.
Keywords: floor;aluminum alloy;remote field eddy current;buried depth defect;detection coil
2021, 47(9):101-106  收稿日期: 2020-10-21;收到修改稿日期: 2021-01-12
基金项目: 国家自然科学基金(51865033)
作者简介: 范钦磊(1987-),男,江苏南通市人,副高工,研究方向为轨道车辆铝合金焊缝的无损检测与寿命评估
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