Abstract
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.
Highlights
Carbon steel materials were widely used in nuclear power generation, oil and gas pipeline transportation, machinery manufacturing, and transportation
When the lift-off value is 1 mm, the signal-to-noise ratio of the orthogonal axial probe is about 18% less than that of the conventional orthogonal probe and the output signal of the defect is about 21.4% larger than that of the conventional orthogonal probe
The obtained findings of the study were as follows: (1) The relationship between the dimensions and sensitivity of the orthogonal axial probe is studied by simulation, and an optimal probe size is obtained
Summary
Carbon steel materials were widely used in nuclear power generation, oil and gas pipeline transportation, machinery manufacturing, and transportation. Carbon steel plates were mainly used for welding as components of pressure-bearing equipment [1]. Due to long-term high temperature, high pressure, causticity, and other adverse changes in the working environment, carbon steel welds often have cracks, corrosion, small holes, and other defects, resulting in early damage to the equipment and even harm to human life [2]. In view of the lift-off effect of eddy current detection, a Hoshi probe, as a fundamental uniform eddy current (UEC) probe, was invented by Hoshikawa. It consists of a tangential rectangular excitation coil and a circular detection coil, in which the circular coil is placed
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