EDDY CURRENT FLAW DETECTING PROBE AND FLAW DETECTING METHOD USING IT

PURPOSE:To enable an insertion type eddy current flaw detecting prove to quickly detect a crack, etc., of a metallic pipe, etc., with high sensitivity irrespective of the direction and length of the crack and, at the same time, to improve the inserting property into a bend section, durability, and maintainability of the probe by constituting the probe compact and simple so that the probe can perform flaw detection in a spiral section without requiring any rotating mechanism. CONSTITUTION:This probe is an insertion type eddy current probe provided with a plurality of coils 9a, 9b, and 9c wound around and in parallel with a plurality of axial cross sections which divide roughly equally the probe 1 in the peripheral direction and AC currents are successively made to flow to the coils by delaying the phase so as to generate a radial magnetic field rotating around an object to be inspected. An eddy current generated on the peripheral surface of the object to be inspected is detected from the magnetic filed.