摘要
由于奥氏体不锈钢焊缝晶粒组织粗大以及结构的各向异性导致超声声束的散射和畸变,其超声检测比较困难。本文分析了奥氏体不锈钢焊缝超声检测特性,在奥氏体不锈钢焊缝试块上进行了常规超声和相控阵超声检测试验。研究结果表明:对于10 mm深焊缝缺陷,相控阵超声检测信噪比可达14 dB,而常规超声技术仅获得6 dB的信噪比,对于30 mm深内部缺陷,均未取得较好的效果。
The ultrasonic testing(UT) of austenitic stainless steel welds defects is always difficult because its coarse-grained material and anisotropic structure which lead to aberration and scattering of the ultrasonic waves.In this paper,ultrasonic testing properties of austenitic welds were analyzed.Ultrasonic test and ultrasonic phased array test were performed in an austenitic stainless steel welds test block.The results reveal that 14 dB signal-to-noise ratio(SNR) is obtained by ultrasonic phased array test while by ultrasonic test only 6 dB SNR is obtained to the defects in 10 mm depth.But both of these two tests cannot detect the defects in 30 mm depth.
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2013年第1期8-11,4-5,共4页
Journal of Henan University of Science And Technology:Natural Science
基金
浙江省重大科技专项计划基金项目(2011C11079)
关键词
超声波相控阵
超声检测
奥氏体不锈钢焊缝
信噪比
ultrasonic phased array
ultrasonic testing
austenitic stainless steel welds
signal-noist ratio
