Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. 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 03-05-2019 1 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 03-05-2019 2 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. 03-05-2019 3
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