On the basis Of electromagnetic induction principle, wellhead detection unit for rod defect is developed.It can solve successfully the problem on flaw detection of sucker rod defect.

• 抽油杆缺陷井口检测装置是根据电磁感应原理设计研制的,它成功地解决了在油井作业过程中对抽油杆缺陷的探伤检测,科学淘汰缺陷超值杆。