PURPOSE: To execute an eddy current flaw detection in all parts of a tube by inserting an insertion probe coil into the tube, and turning it in the peripheral direction.
CONSTITUTION: An insertion probe coil 3 is inserted into a bobbin 4 from a tube expanded part D until a flange plate 6 abuts on a tube plate 2. The probe coil 3 is in parallel to the axial direction, in the side face of the bobbin 4, and to its end face, a pair of coils 5 being parallel to the direction vertical to the axial direction are wound round and formed. Accordingly, when an eddy current flaw detection is executed in the peripheral direction by turning the probe coil centering around the tube axis direction, only a defect generated in the tube can be detected as a discontinuous part without being influenced by a discontinuous part formed in the tube axis direction by the plate 2, the tube expanded part D and a tube end 9, etc., and a flaw detection can be executed in all parts of the tube.
GONDA YOROZU
YOSHIDA TAMEKICHI
SHIN NIPPON HIHAKAI KENSA KK
| JP46033315A |