活塞杆摩擦焊接头的超声检测及缺陷二维重构

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (2): 21-25.

活塞杆摩擦焊接头的超声检测及缺陷二维重构

朱明^*1, 张虎龙¹, 陈昱宇¹, 石玗¹, 侯国清², 刘涛³

1.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050;
2.广西柳工机械股份有限公司, 广西柳州 545007;
3.中国航发南方工业有限公司无损检测中心, 湖南株洲 412002

收稿日期:2020-11-27 出版日期:2021-04-28 发布日期:2021-05-11
通讯作者: 朱明(1984-),男,甘肃兰州人,博士,副研究员.Email:zhumings@yeah.net
基金资助:
国家自然科学基金(51805234,52065041),甘肃省引导科技创新发展专项资金项目(2018ZX),甘肃省重点研发计划项目(20YF3WA017)

Ultrasonic testing of friction welded piston rod joints and two-dimensional reconstruction of defect contour

ZHU Ming¹, ZHANG Hu-long¹, CHEN Yu-yu¹, SHI Yu¹, HOU Guo-qing², LIU Tao³

1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Guangxi Liugong Machinery Co., Ltd., Liuzhou 545007, China;
3. Nondestructive Testing Center, Aecc South Industry Company Limited, Zhuzhou 412002, China

Received:2020-11-27 Online:2021-04-28 Published:2021-05-11

摘要/Abstract

摘要： 针对活塞杆摩擦焊接头的未熔合缺陷,采用超声无损检测方法对部件接头进行检测并提取了含噪声的超声回波信号,利用小波降噪法对含噪声缺陷信号进行了降噪处理,通过多位置、多点检测的方法对未熔合缺陷进行了二维轮廓重构.结果表明:1) 通过优化小波阈值降噪算法的参数提高了回波信号的信噪比,可以提升检测的有效性与准确性;能实现对缺陷信号的降噪并保证信号的完整性;2) 对检测数据进行理论计算确定了缺陷的多位置边缘点,通过缺陷边缘点的拟合,实现了未熔合缺陷的二维轮廓重构,重构结果与破坏性检验结果基本吻合.

关键词: 摩擦焊活塞杆, 超声检测, 小波降噪, 二维轮廓重构

Abstract: For the incomplete fusion defect of the friction welded joint of the piston rod, the ultrasonic non-destructive testing method was used to testing the weld joint of the piston rod and then the ultrasonic echo signal containing noise was extracted. The wavelet noise reduction method was used to filter and reduce the defect signal containing noise.The two-dimensional contour reconstruction of the incomplete fusion defect is carried out by the method of analyzing multi-position and multi-point ultrasonic echo signal. The result shows that: 1) By optimizing the parameters of the wavelet threshold noise reduction algorithm, the signal-to-noise ratio of the ultrasonic echo signal can be improved, and the effectiveness and accuracy of the detection result can be improved. Also it can realize the noise reduction of the defect signal and ensure the integrity of the signal;2) Inspection data was theoretically calculatedto determine the edge points of the defect. Through fitting the edge points of the multi-position defect, the two-dimensional contour reconstruction of the incomplete fusion defect is realized, and the reconstruction result is basically consistent with the destructive inspection result.

Key words: friction welded piston rod, ultrasonic non-destructive testing, wavelet noise reduction, two-dimensional contour reconstruction

中图分类号:

TG115.28+5

朱明, 张虎龙, 陈昱宇, 石玗, 侯国清, 刘涛. 活塞杆摩擦焊接头的超声检测及缺陷二维重构[J]. 兰州理工大学学报, 2021, 47(2): 21-25.

ZHU Ming, ZHANG Hu-long, CHEN Yu-yu, SHI Yu, HOU Guo-qing, LIU Tao. Ultrasonic testing of friction welded piston rod joints and two-dimensional reconstruction of defect contour[J]. Journal of Lanzhou University of Technology, 2021, 47(2): 21-25.

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