Total focus ultrasonic testing of main pipe weld with stainless steel surfacing layer
摘 要
针对带不锈钢堆焊层的主管道焊缝在进行超声检测时,存在结构噪声干扰严重的问题,开展了全聚焦(TFM)超声成像试验研究。以堆焊层内部深度为65 mm,直径为2 mm的侧钻孔为例,当所用阵元数从16增加到64时,其TFM图像信噪比提高了5.3 dB,阵列性能指数降低了35%。在此基础上,进一步引入相位相干成像(PCI)法,对TFM图像进行加权处理。与原始TFM图像相比,PCI法能有效改善图像的信噪比和分辨力。对于64阵元得到的图像,信噪比提高了13.19 dB,阵列性能指数降低了约65%。
Abstract
To solve the problem that structural noise interferes the defect identification of main pipe weld with stainless steel surfacing layer by ultrasonic testing, the total focusing method (TFM) is carried out by experiments in this paper. Taking the side-drilled hole with 2 mm diameter and 65 mm internal depth in the surfacing layer as an example, the TFM imaging results show that the signal-to-noise ratio increases by 5.3 dB and the array performance indicator decreases by 35% when the number of array elements are increased from 16 to 64. On this basis, phase coherence imaging (PCI) is introduced to weight the TFM image. PCI method can effectively improve the signal-to-noise ratio and image resolution. Compared with the original TFM images, signal-to-noise ratio increases by 13.19 dB and array performance indicator decreases by 65% for the image obtained by 64 elements.
中图分类号 TB553 TH142.1 TG115.28 DOI 10.11973/wsjc202108013
所属栏目 无损检测新技术发展与应用专题
基金项目
收稿日期 2021/5/19
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备注赵天伟(1983-),男,高级工程师,主要从核电领域的无损检测工作
引用该论文: ZHAO Tianwei,LIAO Jingyu,JIN Shijie,YANG Huimin,KANG Da. Total focus ultrasonic testing of main pipe weld with stainless steel surfacing layer[J]. Nondestructive Testing, 2021, 43(8): 62~66
赵天伟,廖静瑜,金士杰,杨会敏,康达. 带不锈钢堆焊层的主管道焊缝全聚焦超声检测[J]. 无损检测, 2021, 43(8): 62~66
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【5】郑阳, 郑晖, 潘强华, 等. 国内外相控阵超声检测标准比较与分析[J]. 无损检测, 2016, 38(7):56-65.
【6】ZHANG T, BRUST F W, WILKOWSKI G, et al.Weld residual stress analysis and the effects of structural overlay on various nuclear power plant nozzles[J]. Journal of Pressure Vessel Technology, 2012, 134(6):061205.
【7】MARQUES M J, RAMASAMY A, BATISTA A C, et al.Effect of heat treatment on microstructure and residual stress fields of a weld multilayer austenitic steel clad[J]. Journal of Materials Processing Technology, 2015, 222:52-60.
【8】HOLMES C, DRINKWATER B W, WILCOX P D.Post-processing of the full matrix of ultrasonic transmit-receive array data for non-destructive evaluation[J]. NDT & E International, 2005, 38(8):701-711.
【9】周正干, 李洋, 周文彬.相控阵超声后处理成像技术研究、应用和发展[J]. 机械工程学报, 2016, 52(6):1-11.
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【14】林莉, 史思琪, 孙旭, 等. 基于自回归谱外推的全聚焦成像分辨力提升[J]. 机械工程学报, 2020, 56(22):8-13, 23.
【15】PENG C Y, BAI L, ZHANG J, et al.The sizing of small surface-breaking fatigue cracks using ultrasonic arrays[J]. NDT & E International, 2018, 99:64-71.
【16】CRUZA J F, CAMACHO J, FRITSCH C.Plane-wave phase-coherence imaging for NDE[J]. NDT & E International, 2017, 87:31-37.
【17】GAUTHIER B, PAINCHAUD-APRIL G, DUFF A L, et al. Towards an alternative to time of flight diffraction using instantaneous phase coherence imaging for characterization of crack-like defects[J]. Sensors, 2021, 21(3):730.
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