WEIDOX960钢对接焊试件金属磁记忆信号的变化特征分析  

Change Law of Magnetic Memory Signal of WEIDOX960 Welding Steel under Static Load

作　　者：李冲冲 王倩 李艳霞 范涛 Li Chongchong;Wang Qian;Li Yanxia;Fan Tao(School of Materials Science&Engineering,North China Institute of Aerospace Engineering,Langfang 065000,China;Hebei Key Laboratory of Thermal Protection Materials(Preparatory),Langfang 065000,China)

机构地区：[1]北华航天工业学院材料工程学院,河北廊坊065000 [2]河北省热防护材料重点实验室(筹),河北廊坊065000

出　　处：《北华航天工业学院学报》2023年第6期7-10,共4页Journal of North China Institute of Aerospace Engineering

基　　金：北华航天工业学院博士科研启动基金(BKY202102);河北省高等学校科学研究项目(QN2022039)。

摘　　要：本文基于三维磁敏传感单元以WELDOX960钢焊接接头试件为研究对象,对比分析了不同静载荷作用下有/无预制裂纹缺陷的焊接接头试件自发射漏磁场的分布规律及变化特征,并探讨了采用“类李萨如图”表征焊接应力水平和裂纹缺陷的新方法。结果表明:焊接接头试件的自发射漏磁场分布与应力水平存在一定的相关性,磁记忆信号在焊缝处存在明显的畸变特征,预制裂纹的焊接接头试件存在“二次畸变”特征,根据磁记忆信号的分布特征可以明确指示焊接接头试件的应力集中和缺陷位置;磁记忆信号二维分量合成的类李萨如图为识别焊接缺陷提供了一种新的方法。Based on the three-dimensional magnetic sensor,WEIDOX960 steel welded joint specimens are taken as the research object.The distribution and variation characteristics of the self-emission leakage magnetic field of welded joint specimens with or without precrack defects under different static loads are comparatively studied.And a possible method for characterizing welding stress level and crack defects by"Lissajous"like diagram is discussed.The results show that there is a certain correlation between the self-emission leakage magnetic field of welded specimens and the stress level,the magnetic memory signal has obvious distortion characteristics at the welded joint,and the welded joint specimens with prefabricated crack have the characteristics of"secondary distortion".According to the distribution characteristics of magnetic memory signal,the stress concentration and defect location of welded joint specimens can be clearly indicated.The"Lissajous"like graph synthesized by the two-dimensional components of magnetic memory signal provides a new method for identifying welding defects.In conclusion,this study provides further guidance for the identification of welding crack defects by magnetic memory technology,but it still needs further research and exploration.

关 键 词：金属磁记忆 焊接缺陷 损伤评估 静载拉伸 李萨如图 

分 类 号：TG115.28[金属学及工艺—物理冶金]