Phased array ultrasonic testing and positioning deviation correction technology for nickel-based welds
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摘要: 采用常规超声波检测技术对镍基焊缝进行检测时，由于焊缝晶粒组织粗大，且各向异性，对超声检测的定量、定位分析有较大影响，所以镍基焊缝内部的质量情况缺乏有效的监测手段。分析了相控阵超声检测技术的优势，提出了针对镍基焊缝相控阵超声检测的双阵列低频纵波检测方法，结合试验进行了检测验证，结果显示，使用该检测工艺的信噪比满足相关标准工艺要求。最后对缺陷定位偏差进行了分析，并提出修正方法，修正后的缺陷定位精度达到90%以上。Abstract: Some power plant pipelines are welded by nickel-based welding rods. When using conventional ultrasonic testing technology to detect such welds, the coarseness and anisotropy of the weld grain structure have a great influence on the quantitative and localized analysis of ultrasonic testing. Therefore, there is a lack of effective means for monitoring the quality of the inside of the nickel-based weld. The advantages of phased array ultrasonic testing technology are analyzed. A dual array low frequency longitudinal wave detecting method for phased array ultrasonic testing of nickel-based welded joints is proposed. The test is verified by the combination test. The results show that the signal-to-noise ratio of the detection process meets the relevant standards of process requirements. The defect positioning deviation is analyzed, and the correction method is proposed. The corrected defect positioning accuracy is over 90%.
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