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Credibility ,(2) the method of magnetic flux leakage magnetic flux leakage method is based on the basic principle of the high permeability of the properties of ferromagnetic materials, elbow corrosion defect of permeability is far less than the permeability of elbow, elbow in the applied magnetic field under the action of magnetized, when no defect of the bend, for the most part lines by steel tube, the lines of magnetic force uniform distribution; When bend internal flaws, the lines of magnetic force bent, leaking pipe surface and a part of the field lines. Escape detection by magnetization bend surface of magnetic flux leakage, can determine whether defects exist.
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