压力容器2024，Vol.41Issue(12)：60-66,7.DOI:10.3969/j.issn.1001-4837.2024.12.008
厚壁奥氏体不锈钢焊缝双晶纵波面阵探头矢量相干全聚焦成像
Vector coherence factor-based total focusing imaging for thick-walled austenitic stainless steel welds via dual matrix longitudinal wave array probe
杨宸旭 1严宇 2刘梓昱 1王俊龙 2马志远 1杨会敏 2刘伟达 2张东辉 3林莉1
作者信息
- 1. 大连理工大学 无损检测研究所,辽宁 大连 116024
- 2. 核工业工程研究设计有限公司,北京 101601
- 3. 中国核工业二三建设有限公司,北京 101300
- 折叠
摘要
Abstract
To address the low signal-to-noise ratio(SNR)in total focusing method(TFM)imaging of thick-walled austenitic stainless steel welds,which hinders defect identification,this study proposes a weighted imaging method combining a transmit-receive longitudinal wave(TRL)dual matrix array probe with a vector coherence factor(VCF).A 76 mm-thick austenitic stainless steel weld test block was fabricated with side-drilled holes(SDHs)of 3.2 mm diameter at depths of 10,30,50,and 70 mm.Full matrix capture(FMC)data were acquired using a TRL probe with a center frequency of 2.25 MHz and a 16×4×2 element configuration.Based on the dual-module structure of the 2D array probe,a delay-and-sum(DAS)algorithm incorporating 3D acoustic beam propagation paths was established.The instantaneous phase of signals was extracted to construct the VCF,and the imaging data matrix was reconstructed using a weighting factor,forming the TRL-TFM-VCF imaging method tailored for thick-walled austenitic stainless steel welds.Experimental results demonstrate that,compared to sector scanning and conventional TFM,the TRL-TFM-VCF method improves the SNR of near-surface defects(10 mm depth)by 9.98 dB and 6.37 dB,respectively,and enhances the SNR of near-root defects(70 mm depth)by 8.33 dB and 3.00 dB,respectively.The array performance parameter(APP)is reduced by 4.74 and 4.85,indicating optimized imaging quality.This method effectively enhances ultrasonic inspection SNR and defect localization accuracy for thick-walled austenitic stainless steel welds.关键词
奥氏体不锈钢焊缝/双晶面阵探头/全聚焦成像/矢量相干因子Key words
austenitic stainless steel welds/dual matrix array probe/total focusing method/vector coherence factor分类
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杨宸旭,严宇,刘梓昱,王俊龙,马志远,杨会敏,刘伟达,张东辉,林莉..厚壁奥氏体不锈钢焊缝双晶纵波面阵探头矢量相干全聚焦成像[J].压力容器,2024,41(12):60-66,7.
