Research on the Magnetic Memory Diagnostic Technique of the Plunger Pump Thread

Plunger pump thread is easy to fatigue failure after long-term service in oil industry,and there is not a good way to detect plunger pump thread now.Magnetic memory technology was used in plunger pump thread detection,finite element method was used to analyze the magnetic field of different crack,a magnetic memory testing method of plunger pump thread had been proposed,and the magnetic memory signal characteristics of different defects had been studied.The results of analysis show that the magnetic memory testing technique is an effective method for testing the defects of plunger pump thread,it has a good effect on distinguishing the type of defects.