Research on Magnetic Memory Testing Technology of Samples of Drilling Tools

It is well known that the status of the drilling tools is an important problem in the oil drilling industry. A new nondestructive testing method, metal magnetic memory(MMM) testing, was presented. A new scientific type of test device and test method was designed in experimental research. The experiment was mainly to gain the characteristics of magnetic memory signals of the samples in drilling tool by static tension and pressing crack experiment. Through the experimental research, the relationship between stress value and magnetic memory signal was established.