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首页> 外文期刊>Nondestructive Testing and Evaluation >Ultrasonic C-scan imaging and analysis of the mechanical properties of resistance spot-welded joints of stainless steel
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Ultrasonic C-scan imaging and analysis of the mechanical properties of resistance spot-welded joints of stainless steel

机译：超声波C扫描成像和不锈钢电阻点焊接头力学性能分析

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摘要

The quality of spot-welded joints of 1mm-thick SUS304 stainless steel sheets was investigated using scanning acoustic microscopy. C-scan images were used to characterize the weld evolution characteristics of welds formed under different welding parameters, and A-scan signals of feature regions were collected and analysed. The mechanical properties of the spot-welded joints were described in terms of the peak load, failure energy, failure mode and the failure displacement. The results illustrate that C-scan images can provide information about the internal state of spot-welded joints. The A-scan signals in different feature regions were distinct from each other, and three regions in the spot-welded joints were distinguished on the basis of the A-scan signals and the C-scan images: the weld nugget zone, the heat-affected zone and the fusion zone. When the supply pressure was 0.15MPa, both over-burn defects and splash defects were observed; when the welding current was greater than 8 kA, only splash defects were observed. The peak load, the failure energy and the failure displacement tended to first increase and then decrease with increasing welding current and increasing supply pressure.
机译：使用扫描声学显微镜研究了1mm厚的SUS304不锈钢片的点焊接头的质量。 C扫描图像用于表征在不同焊接参数下形成的焊缝的焊接演化特性，并收集并分析特征区域的扫描信号。根据峰值负荷，故障能量，故障模式和故障位移来描述点焊接头的机械性能。结果说明C扫描图像可以提供关于点焊接头的内部状态的信息。不同特征区域中的A扫描信号彼此不同，并且在点焊接接头中的三个区域基于扫描信号和C扫描图像来区分：焊接块区域，热 - 受影响的区域和融合区。当供应压力为0.15MPa时，观察到过度燃烧缺陷和飞溅缺陷;当焊接电流大于8ka时，仅观察到溅射缺陷。峰值负荷，故障能量和故障位移倾向于首先增加，然后随着焊接电流的增加和增加供应压力而降低。

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