焊接应力磁痕分析与识别  

Analysis and Recognition of Welding Stress Magnetic Mark

作　　者：郭永良 段怡雄 袁丽华[2] GUO Yongliang;DUAN Yixiong;YUAN Lihua(CRRC Zhuzhou Electric Locomotive Co.Ltd.,Zhuzhou 412001,China;Key laboratory of Nondestructive Testing(Ministry of Eduction),Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]中车株洲电力机车有限公司,湖南株洲412001 [2]南昌航空大学无损检测教育部重点实验室,江西南昌330063

出　　处：《现代信息科技》2023年第10期140-142,146,共4页Modern Information Technology

摘　　要：铁磁性材料工件内存在应力时,材料产生各向异性,而应力或应变状态的变化将会引起铁磁性材料磁导率或磁阻的变化,当磁导率或磁阻变化达到一定值时,磁粉检测会出现磁痕显示。为了确定现场磁粉检测时发现的支座夹板中间磁痕形成原因,而开展一系列的试验,分析和明确磁痕形成原因。通过优化焊接工艺可从源头避免磁痕出现,同时介绍了现场鉴别应力磁痕方法和处理方法。When there is a stress in the ferromagnetic material artifact,the material produces anisotropy,and the change of the stress or strain state will cause changes in the magnetic conductivity or magnetic resistance of the ferromagnetic material.when the magnetic conductivity or magnetic resistance change reaches a certain value,the Magnetic Particle Testing will appear magnetic mark display.In order to determine the cause of the formation of the support splint found in thefield Magnetic Particle Testing,a series of tests are carried out to analyze and clarify the cause of magnetic trace formation.Through optimizing the welding process,it can avoid magnetic marks from the source.And the identification and processing methods of stress magnetic mark onfield are introduced at the same time.

关 键 词：应力磁痕 金相检测 应力检测 磁粉检测 超声检测 

分 类 号：TN39[电子电信—物理电子学] TG441[金属学及工艺—焊接]