摘要
针对金属磁记忆检测技术的瓶颈问题,以X70钢为研究对象,通过对预制焊接裂纹一阶微分处理后的金属磁记忆信号进行分析,可区别焊接裂纹引起的应力集中与其它缺口效应引起的应力,并可确定焊接裂纹存在的定位信号特征。现场检测表明,利用一阶微分处理后的磁记忆信号定位特征,可准确地对焊接裂纹进行检测。
To solve the bottleneck problem of metal magnetic memory(MMM), one of the new non-destructive testing methods, which analyzes the derivative MMM signal of pre-welding cracks of X70 pipeline steel, is adopted. The method can distinguish the stress concentration caused by crack from other gaps and extract the location feature of welding cracks. Spot inspection indicates that the welding cracks can be evaluated exactly by the location feature of derivative MMM signal.
出处
《焊接技术》
北大核心
2006年第4期14-15,共2页
Welding Technology
基金
国家自然科学基金资助项目(50475113)
高等学校博士学科点专项基金资助项目(20030056002)
关键词
无损检测
焊接裂纹
应力集中
金属磁记忆
non-destructive testing, welding cracks, stress concentration, metal magnetic memory
