As the profile of the drill pipe thread is complex and have a certain taper

a fast and effective inspection method and equipment is still in lack.A multi-electromagnetic inspection method for drill pipe thread based on the self-magnetization and permanent magnetic perturbation testing method is presented.The probe scanning modes is analyzed and the motion mechanism is designed.The inspection device is developed.The test shows that the inspection equipment has characters of convenience

easy operation

high efficiency

good practicability and wide application prospect.