The uneven surface of the weld seam makes eddy current testing more susceptible to the lift-off effect of the probe. Therefore, the defect of carbon steel plate welds has always been a difficult problem in eddy current testing. This study aimed to design a new type of eddy current orthogonal axial probe and establish the finite element simulation model of the probe. The effect of the probe structure, coil turns, and coil size on the detection sensitivity was simulated. Further, a designed orthogonal axial probe was used to conduct a systematic experiment on the weld of carbon steel specimens, and the 0.2 mm width and 1 mm depth of weld defects of carbon steel plates were effectively detected. The experimental results showed that the new orthogonal axial eddy current probe effectively suppressed the unevenness effect of the weld surface on the lift-off effect during the detection process.

中文翻译：

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正交轴向涡流探头的碳钢板焊接缺陷检测机理研究

焊缝的不平整表面使涡流测试更容易受到探针的剥离作用的影响。因此，碳钢板焊接的缺陷一直是涡流测试中的难题。本研究旨在设计一种新型的涡流正交轴向探头，并建立该探头的有限元仿真模型。模拟了探头结构，线圈匝数和线圈尺寸对检测灵敏度的影响。此外，使用设计的正交轴向探针对碳钢试样的焊接进行了系统的实验，并有效地检测到碳钢板的0.2 mm宽度和1 mm深度的焊接缺陷。