Aiming at the characteristic that punctures and cracks tend to happen at the area between the addition thick transition area and drill pipe’s body

magnetic circuit analysis

optimizing configuration and designing quantificationally of test probe of magnetic flux leakage for drill pipe are carried out by the way of using finite element analysis software to simulate for numerical value and compute electromagnetic field.The chief configuration of test probe of magnetic flux leakage for drill pipe is given.Optimally test pose of probe core and its essentiality is discussed.A scheme of multiple degree of freedom fluctuated of probe core are designed.Approach of reducing blind area and designing of modularity is explained.Experimentation testing shows that the test probe of magnetic flux leakage for drill pipe has characters of non-blind area inspection

fluctuating flexible probe core

modularization and a nicer tryout effect.