摘要
奥氏体不锈钢广泛应用于重大装备的关键部件中,而焊缝是整个装备的薄弱部位。在考虑超声波的多路径和易发生波型转换的特性情况下,进行奥氏体不锈钢小径管焊缝多模式超声相控阵检测方法研究。通过数值仿真,对比分析4种不同直达波检测模式和8种不同底面一次反射波检测模式对小径管焊缝中典型缺陷的检出能力。基于优选出的一种直达波检测模式和一种底面一次反射波检测模式,发展了一种多模式复合全聚焦成像方法。在此基础上,进行奥氏体不锈钢小径管焊缝缺陷检测试验。结果表明,多模式复合全聚焦成像方法可以很好实现小径管中多种缺陷检测,与单一模式全聚焦成像相比,多模式复合全聚焦成像方法不仅可以提高成像的信噪比,且可以大大减小伪像的产生。项目研究工作为奥氏体不锈钢小径管焊缝检测提供了可行的技术方案。
Austenitic stainless steels are widely used in key components of major equipment,and welds are weak parts of the entire equipment.Ultrasonic wave have propagated in Austenitic stainless steels welds with the multi-path and multi-mode propagation characteristics.So the multi-mode ultrasonic phased array detection method for austenitic stainless steel small diameter pipe welds is studied.The detection ability of four different direct wave inspection modes and eight different primary reflection wave inspection modes for typical defects in small diameter pipe welds are compared and analyzed by numerical simulation.A fusion imaging method is developed based on a preferred direct wave detection mode and a bottom surface primary reflection detection mode.On this basis,weld defect detection experiment is carried out on the austenitic stainless steel small diameter pipe.The results show that the multi-mode fusion imaging method can realize the detection of multiple defects in small diameter tubes well.Compared with single mode total focusing imaging method,the fusion imaging method can not only improve the signal-to-noise ratio of imaging,but also greatly reduce the generation of artifacts.The project research work provides a feasible technical solution for the inspection of austenitic stainless steel small diameter pipe welds.
作者
吴斌
杨敬
焦敬品
何存富
齐高君
WU Bin;YANG Jing;JIAO Jingpin;HE Cunfu;QI Gaojun(College of Mechanical Engineering and Application Electronics Technology,Beijing University of Technology,Beijing 100124;POWERCHINA SEPCO1 Electric Power Construction Co.,Ltd.,Jinan 250100)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2020年第14期9-18,共10页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(11772013,11572011,11572010)。
