基于Tx-Rx探头的异种金属焊缝缺陷检测及定量分析

Research on Dissimilar Metal Weld Defect Detection Based on TX-RX ProbeZhang Qing1,Li Xiaoguang 2,Du Yafei2,He Yi2,Zhu Yueming1,Cheng Jingting1,

摘要:

异种金属焊接结构在使用过程中容易产生损伤，因此需对其进行检测。本文采用脉冲涡流一发一收式非同轴(Transmitter-Receiver，Tx-Rx)探头对异种金属焊缝缺陷进行检测，并考虑到异种金属焊接构件成分多样、结构复杂的特点，对Tx-Rx探头的摆放位置进行了优化。首先，建立仿真模型，讨论了激励线圈的摆放位置对试件中涡流及涡流扰动的影响，结果表明，当激励线圈位于带堆焊的合金钢上方时，其表面涡流强度及涡流扰动强度较大；其次，建立实验平台，实验表明，当激励线圈放置在带堆焊的合金钢上方时，其检测信号幅值和差分信号幅值最大；最后利用差分信号的峰值对焊缝缺陷的定量展开分析。本文研究内容可为脉冲涡流Tx-Rx探头或阵列探头在异种金属焊缝缺陷的应用提供参考。

Abstract:

Dissimilar metal welded structure is prone to damage in the process of use, so it needs to be tested. In this paper, the Transmitter Receiver (TX-RX) is used to detect the defects of dissimilar metal welds. Considering the diverse components and complex structures of dissimilar metal welds, the placement position of the TX-RX probe is optimized. Firstly, a simulation model was established to discuss the influence of the position of the excitation coil on the eddy current and eddy current disturbance in the specimen. The results show that when the excitation coil is above the alloy steel with surfacing welding, the eddy current intensity and eddy current disturbance intensity on the surface are larger. Secondly, an experimental platform was established. The experimental results show that when the excitation coil is placed above the alloy steel with surfacing, the amplitude of the detection signal and the differential signal are the largest. Finally, the peak value of differential signal is used to quantitatively analyze the weld defects. The research content of this paper can provide reference for the application of pulsed eddy current TX-RX probe or array probe in dissimilar metal weld defects.