移动闪光焊接头热处理缺陷产生原因及消除方法  

Causes of Defects in Heat Treatment of Mobile Flash Butt Welded Joints and Their Elimination Methods

作　　者：丁韦 高振坤 史启帅 胡玉堂 DING Wei;GAO Zhenkun;SHI Qishuai;HU Yutang(Metals and Chemistry Research Insititute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081

出　　处：《高速铁路新材料》2022年第2期50-53,共4页Advanced Materials of High Speed Railway

基　　金：中国国家铁路集团有限公司科技研究开发项目(N2019G058)。

摘　　要：针对闪光焊接头超声波双探头探伤不合格的接头进行了宏观及微观组织分析,发现由于接头热处理加热不均匀,造成正火后接头显微组织不一致,焊缝部分区域珠光体转变不完全,由此形成了超声波反射界面。采用线圈外磁场感应加热方式,加热线圈与钢轨表面距离的偏差是导致接头组织不一致的主要原因。应注意严格确保线圈与钢轨表面间隙。当出现双探头探伤不合格时,应采用单探头进行复探,如在合格范围内,可更换设备,对接头进行再次热处理,缺陷即可消除。The macroscopic and microstructure analysis of the flash butt welded joint which is unqualified in ultrasonic dual-probe flaw detection showed that the uneven heat treatment of the joint caused inconsistent microstructure of the joint after normalizing,and the pearlite transformation in some areas of the welded joint was incomplete.As a result,an ultrasonic reflection interface was formed.The induction heating method with coil external magnetic was adopted,and the deviation of the distance between the heating coil and the surface of the rail was the main reason of the inconsistent joint organization.Care should be taken to strictly ensure the clearance between the coil and the surface of the rail.When the double-probe test is unqualified,a single probe should be used for retesting.If the test result is within the qualified range,the equipment can be replaced,and the joint can be heat-treated again,and the defect can be eliminated.

关 键 词：闪光焊接头 热处理 探伤缺陷 感应加热 线圈外磁场 

分 类 号：U216.424[交通运输工程—道路与铁道工程]