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DESCRIPTION JPS57151560
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 also show an example of ultrasonic
flaw detection inspection of a tube end weldment using a conventional probe, and FIG. 1 is a
longitudinal sectional view, FIG. 1 is an A = A sectional view of FIG. 1, FIG. 3 to FIG. 6 illustrate an
embodiment according to the present invention, and FIG. 3 is a longitudinal sectional view of a
probe, 'FIG. 3 is a cross-sectional view taken along the line B-B in FIG. 3, FIG. 5 is a longitudinal
sectional view showing the use of the tube end weld in ultrasonic flaw inspection, FIG. 6 is a
cross-sectional view taken along the line CC in FIG. The figure is a book. FIG. 8 is a view showing
another embodiment of the probe according to the present invention, and FIG. 8 is a crosssectional view of FIG. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · water seal material, 6 · · · · Plugs, 7 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · ultrasonic waves, 9 · · · · · · · · water chamber, 10 · · · · · · · · · · ··· Water, 12 · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ultrasonic reflector, 13 · · · · ultrasonic reflection
surface, 14 · · · · · · focus.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of an intercalation type ultrasonic flaw detection probe suitable for ultrasonic flaw detection of a
small diameter cylindrical test object from the inside of a hole. Fig. 2 shows the working situation
in the case of using a conventional ultrasonic flaw detector to inspect defects in a heat exchanger
or the like, where welds between tube or tube and tube sheet, ie, tube ends # *) occur. It is a
figure explaining. The main body of the flaw detection jig 2 in the hole of the main material 1
which is the object to be inspected in the figure "" "" "G87 pipe H ˜ ° D". Vibration is possible ".
Water seal material4. The transducer for the inner insertion ultrasonic flaw detection composed
of S and plug 6 is inserted to detect a defect of the tube end weld part 7, and the transducer 3
emits the ultrasonic wave 8 in the direction perpendicular to the hole axis. For this purpose, the
probe main body 2 is set in the direction perpendicular to the hole axis. On the other hand, there
is a water chamber 9 between the water sealants 4 and 5 and there is a water chamber 9, and it
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is a medium for propagating the ultrasonic wave 8 to the tube l which is the inspection object,
the tube end weld 7 and the tube sheet 10 It is filled with water 11 supplied through the inside
of the tool body 2. Since it is a structure as mentioned above, nine plaster IJMB fired from
vibrator 3 enters into tube 1 which is a inspected object via water U, tube end welding part 7,
and tube sheet 10, and into these, If a defect exists, it is reflected by the defect and returns to the
vibrator 3 through the incident path again. 2. The flaw detection jig main body 2 and the vibrator
internally wounded by this principle. By rotating the water sealing material 4.5 and the plug 6,
the tube l which is the inspection material, the tube, the end welding part 7 and the tube sheet
104h are countered from the existing defects! 'T air' 881 Catch and inspect the wave resistance.
In the conventional probe, as described above, the ultrasonic wave 8 # from the vibrator 3
directly attached to the tube 1 of the tube V ′ ′ 1 as a material to be inspected. There is an
advantage that sensitivity or accuracy inspection can be made to enter the tube end weld 7 and
the tube sheet IO, but depending on the size in the axial direction (parallel direction to the
ultrasonic wave 80 emitting direction) of the opposite transducer 3 There are six defects in
which the minimum inspectable hole diameter of the pipe material 1 is greatly restricted. That is,
since the dimensions of the vibrator 3 are generally large in the axial direction, flaw detection
inspection of a small-diameter test object having a diameter smaller than that of the vibrator 30
is extremely difficult. An object of the present invention is to provide an internally inserted
ultrasonic flaw detection probe capable of significantly reducing the hole diameter of an
inspection object to be inspected and capable of highly accurate flaw detection. One embodiment
of the present invention will be described with reference to FIGS. 3 to 6. In FIGS. 3 and 4, 2 is a
flaw detection jig main body, 4 and 5 are water seal materials, and their structure and function. Is
almost the same as the above-mentioned conventional products;
3 is a transducer, 臆 is an ultrasonic reflector, 13 is an ultrasonic wave, 鴫 ('89 reflective surface,
the transducer 3 is installed in the axial direction of the flaw detection jig main body 2, and
further ultrasonic reflection surface recognition is The structure is installed in the flaw detector
jig main body 2 at a position facing the transducer 3 and is reflected at an appropriate angle by
the ultrasonic wave reflection surface 13 emitted from the transducer 3. In FIGS. 5 and 6, an
electric signal transmitted from a transmitter (not shown) is converted into an ultrasonic wave 8
by the vibrator 3 and emitted in a direction parallel to the hole axis of the tube l to be inspected.
9. It is propagated through the water 11 filled in 9 and reflected by the ultrasonic reflection
surface 13 to change the course, and the tube material 1. It enters into the tube end weld 7 and
the tube sheet 10. The incident ultrasonic waves 6 are reflected by the defect when there are
defects in the tube l, the tube end weld 7 and the tube sheet 10 which are the inspection object,
and the incident path is created to return to the vibrator 3; It is again converted to an electrical
signal and displayed as a defect signal on a receiver (not shown). When the ultrasonic reflector is
attached in this way, the diameter of the ultrasonic reflector can be made smaller than the
dimension in the axial direction of the transducer, so an inspection object with a smaller diameter
than that of the prior art. The examination can be done. 7 and 8 show other examples and
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embodiments of the shape of the ultrasonic wave reflection surface of the ultrasonic wave
reflector 5 ° in FIGS. 7 and 8 and 3 in FIG. The ultrasonic reflector is attached at the same
position as in FIG. 5, but the ultrasonic reflection m13, which is the reflection surface of the
ultrasonic wave 80, has an appropriate curvature as shown in FIG. Therefore, the ultrasonic wave
8 striking the ultrasonic reflection surface 13 having this curvature focuses the focal point 14 at
a point on the @ 11 direction of ultrasonic reflection depending on the size of the curvature. That
is, flaw detection with extremely high accuracy can be performed by selecting the curvature of
the ultrasonic wave reflection th + 13 so that the focal point 14 comes to the position most
desired to be inspected. The present invention has a simple structure in which the ultrasonic
reflector is attached to face the transducer as described above, and the minimum size of the
testable hole diameter is not limited by the axial size of the transducer. The minimum pore
diameter can be significantly reduced, and the accuracy of flaw detection can be extremely
improved.
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