摘要
以某厂生产的无缝钢管经磁粉检测后管端内表面出现凹陷为例,通过对凹陷的宏观形貌、金相组织、硬度等检验分析,得出了凹陷产生的原因是磁粉探伤机电极表面氧化后与钢管内表面接触不良,局部区域电阻过大,导致钢管内表面发生熔化,同时产生电弧烧伤钢管内表面;并提出了防止钢管磁粉检测过程中产生管端凹陷的建议。
The seamless steel tube made by a certain manufacturer has got depressions on its inner surface at the end as occurring after being detected with magnetic particle process. Taking such a tube as the sample, the depression area is analyzed via tests concerning macro-morphology, metaHographic structure and hardness, etc. The analysis result reveals how the said depression is developed. It is because that during the detection process, the electric pole surface of the machine gets oxidized, and thus causes poor contact with the tube surface, which results in excessively- high electric resistance in local area, and the tube inner surface is in turn melted, and electric arc occurs to get the surface burnt. Based on the above mentioned facts, relevant suggestions are proposed to prevent occurrence of the defective tube-end depressions during the magnetic particle detection operation.
出处
《钢管》
CAS
2013年第4期64-67,共4页
Steel Pipe
关键词
磁粉检测
无缝钢管
管端凹陷
电极氧化
电弧
钢管熔化
magnetic particle detection
seamless steel tube
tube-end depression
electric pole oxidization
electric arc
steel tube melting
