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首页> 外文期刊>Journal of Nondestructive Evaluation >Metal Magnetic Memory Inspection of Q345 Steel Specimens with Butt Weld in Tensile and Bending Test
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Metal Magnetic Memory Inspection of Q345 Steel Specimens with Butt Weld in Tensile and Bending Test

机译：Q345钢标本金属磁雾检测，带弯曲试验

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摘要

Metal magnetic memory (MMM) method is a non-destructive testing method based on the analysis of self-magnetic-leakage field (SMLF) distribution on components' surfaces. The MMM method can determine stress concentration zones, imperfections, and heterogeneity in the microstructure of the material and in welded joints. In order to study the magnetization of defective and non-defective butt welded Q345 steel specimens under tensile and bending loads, the normal component of the SMLF (H-p(y)) field values were measured. The results demonstrate that H-p(y) field values and gradients are effective in capturing different stress states under tensile and bending loads. The distribution of H-p(y) field values for flexural tests are quite different from that of tensile tests. The gradient values can be used to determine the degree of stress concentration. In addition, three characteristic parameters were calculated. All three parameters can predict failures with early warnings. Specifically, whether the specimen is in tensile stress state or in compressive stress state can be distinguished by the average value of H-p(y) field area. The quality of the butt weld can be judged by the magnetic index (m). The judging criteria can be a significant complement to the inspection of welded joints using MMM method. Further research could help to validate the judging criteria and analyse the factors affecting the accuracy of the predictions.
机译：金属磁存储器（MMM）方法是基于分析组件表面上的自磁漏电场（SMLF）分布的非破坏性测试方法。 MMM方法可以确定材料和焊接接头的微观结构中的应力集中区域，缺陷和异质性。为了在拉伸和弯曲载荷下研究有缺陷和非缺陷对焊接Q345钢样品的磁化，测量SMLF（H-P（Y））场值的正常组分。结果表明，H-P（Y）场值和梯度在捕获拉伸和弯曲载荷下捕获不同的应力状态。弯曲试验的H-P（Y）场值与拉伸试验的分布与拉伸试验的分布完全不同。梯度值可用于确定应力浓度程度。此外，计算了三个特征参数。所有三个参数都可以预测早期警告的故障。具体地，可以通过H-P（Y）场区域的平均值来区分样品是否处于拉伸应力状态或压缩应力状态。可以通过磁指数（m）来判断对接焊接的质量。判断标准可以是使用MMM方法检查焊接接头的显着补充。进一步的研究可以帮助验证判断标准，并分析影响预测准确性的因素。

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