JP6110735B2 - UT inspection device - Google Patents

Description

  The present invention relates to a UT inspection apparatus that ultrasonically detects a non-destructive inspection of a butt weld portion and a U-shaped bending corner portion of a thin-walled long rectangular tube can part by a water immersion type plate wave method.

  Conventionally, methods and inspection apparatuses for nondestructive inspection are known for various steel materials, and these have been appropriately devised according to the inspection site and shape of the steel material. Patent document 1 etc. are known as an example of the inspection method and apparatus which concern.

  In the UT (Ultrasonic Testing) inspection apparatus of the present invention, a defect in the butt weld and U-bend corner of the object to be measured is inspected by nondestructive inspection using ultrasonic waves transmitted from an ultrasonic probe. The object to be measured here is a long rectangular tube that has been subjected to U-bending of two long thin plate materials and then subjected to butt welding in the longitudinal direction. In addition, one end of a long rectangular tube that has been subjected to U-bending and longitudinal butt welding is a short rectangular tube having a different thickness, manufactured in the same process as the long rectangular tube. The whole structure is welded over the entire circumference of the tube so as to form an integral structure.

JP-A-5-99902

  In the existing UT inspection apparatus in such a case, ultrasonic flaw detection is performed on the longitudinal butt weld and the U-bend corner by a local water immersion type plate wave method using a rubber O-ring, and the O-ring of the object to be measured The flaw detection condition is that the contact surface is flat. Therefore, due to the effect of the step generated by welding the rectangular tube tubes having different thicknesses, it is not possible to detect a part of the corner portion of the butt all-around weld portion, the longitudinal butt weld portion, and the U-bend corner portion.

  In addition, in the conventional UT inspection device that enables ultrasonic inspection of all lines including the butt welding area, while performing ultrasonic inspection of the longitudinal butt weld and the U-bend corner, the flaw detection is performed by the water immersion method. To do.

  In the case of the water immersion method, it is required that the incident angle with respect to the object to be measured and the water distance between the object to be measured and the ultrasonic probe are always kept constant during the flaw detection. Since the object to be measured is a can part made of a thin long rectangular tube having a total length of about 4500 mm, undulation is generated on the ultrasonic incident surface of the object to be measured. Even in such a case, in order to keep the incident angle and the water distance constant, a probe unit including a scanning mechanism that performs flaw detection while following the undulation of the measurement object incident surface is required.

  In addition, as a function required for the longitudinal probe unit, an ultrasonic probe for flaw detection in the longitudinal butt weld and an ultrasonic probe for flaw detection in the U-shaped bending corner are installed, and butt welding in the longitudinal direction. It is necessary to perform the flaw detection on the corner and the U-bend corner at the same time. Moreover, it is necessary to provide a circumferential direction probe unit dedicated to the all-round butt-welded portion separately from the longitudinal direction probe unit.

  In view of the above, the present invention provides a UT inspection apparatus suitable for ultrasonic flaw detection by the water immersion type plate wave method for non-destructive inspection of butt welds and U-shaped bending corners of thin-walled long rectangular tube can parts. The purpose is to provide.

  As described above, in the present invention, a UT inspection device for a thin-walled rectangular tube long can part formed by bending a plate material into a U-shaped material and welding a butt portion, which is installed on a pedestal A flaw detection unit body installed between the water tank and the struts at both ends in the longitudinal direction of the pedestal, a measured object support mechanism for fixing a thin-walled square tube long can part fixed at the bottom of the flaw detection unit main unit, and the flaw detection unit main body The elevating mechanism that guides the thin canned rectangular tube long can part installed in the object support mechanism into the aquarium, and the flaw detecting unit main body and the thin square tube long can part A probe unit positioned between the base plate and the base plate and a lift cylinder connected to the base plate, one of which is fixed to the flaw detection unit body via the lift cylinder and the other to the base plate. The offered row Optionally with are contactable with thin rectangular tube pipe length scale can manufacturing parts, characterized in that rotatably mounted on the ultrasonic probe on opposite sides of the base plate of the roller.

  The present invention uses a water immersion type plate wave method for ultrasonic flaw detection of a thin canned rectangular tube long can part, while keeping the incident angle and water distance constant, and the butt weld and U-shaped bend of the object to be measured. It becomes possible to detect the corner portion.

The figure which shows the whole structure of the UT inspection apparatus which performs ultrasonic flaw detection by the water immersion type plate wave method. The figure which shows the manufacturing process of the thin-walled long rectangular tube can components which are to-be-measured objects. The figure which shows the outer setup work of a UT inspection apparatus. The figure which shows the specific structure of the probe unit attached to the flaw detection part main body.

  Hereinafter, an embodiment of a UT inspection apparatus according to the present invention will be described with reference to the drawings.

  FIG. 2 shows a manufacturing process of a thin long rectangular tube can part which is an object to be measured. In this manufacturing process, two long thin plates 1A1 and 1B1 are bent at two locations to form U-shaped materials 1A2 and 1B2, respectively, and the longitudinal butt portions 1C of the two U-shaped plate materials are welded. A long rectangular tube 1 is used. The UT inspection points of the thin-walled long rectangular tube can part having such a shape are a welded longitudinal butt portion 1C and a longitudinal bent portion 1D. In the example of FIG. On the other hand, the latter is the target in four longitudinal directions. In particular, since a rectangular tube with a different plate thickness is welded to the longitudinal end portion of the thin long rectangular tube can part, which is the DUT 1, the UT inspection at the end welded portion is also important. It is.

  Since the UT inspection of a thin-walled long rectangular tube can part is performed by the water immersion type plate wave method, the thin-walled long rectangular tube can part 1 is installed in water. For this reason, the external setup work of the to-be-measured object 1 is performed before entering a flaw detection work so that water may not enter the inside of the thin-walled long rectangular tube can part 1. FIG. 3 shows the external setup work of the UT inspection apparatus according to this embodiment. In the outer setup work before the flaw detection work, for example, the sealing device 2 having a through hole 31 in the shaft 3 is inserted at both ends of the measurement object 1 having a total length of about 4500 mm, and the measurement object 1 and the sealing device 2 are connected. The tape is wrapped around the entire circumference of the contact surface and sealed.

  The purpose of the seal is to prevent water from entering the device under test 1 when the device under test 1 is submerged in the water tank 4. The reason for using the sealing device 2 having the through hole 31 in the shaft 3 is to fix the DUT 1 to the UT inspection device. In this case, the DUT 1 may be a thin-walled long rectangular tube can part 1 manufactured according to the procedure of FIG. 2, and furthermore, a rectangular tube having a different plate thickness is provided at the end thereof. The welded thin-walled long rectangular tube can part 1 may be used.

  FIG. 1 shows the overall configuration of a UT inspection apparatus that performs ultrasonic flaw detection by a water immersion type plate wave method. FIG. 1 shows a side view of the UT inspection apparatus. In the UT inspection device, the water tank 4 is installed on the lower pedestal 40. Since the UT inspection of the thin-walled long rectangular tube can part is performed by the water immersion type plate wave method, the total length of the water tank 4 is set to be longer than the measured object 1 having a total length of about 4500 mm, for example.

  Struts 18A and 18B are provided on the left and right ends of the UT inspection apparatus, and the flaw detection unit main body 9 is installed between the struts 18A and 18B via an elevating mechanism 19. The flaw detection part main body 9 is installed along the longitudinal direction of the water tank 4. Reference numeral 20 installed on the support pillars 18A and 18B is an elevating motor for driving the elevating mechanism 19 to elevate and lower the flaw detection unit body 9.

  Several mechanisms are installed on the lower surface of the flaw detection unit main body 9. One of them is a measured object support mechanism 41 installed at both ends of the lower surface of the flaw detection unit main body 9. The left measured object support mechanism 41A is fixed to the lower surface of the flaw detection unit main body 9, and includes a fixed holder 6 at the tip thereof. The right object support mechanism 41B is also fixed to the lower surface of the flaw detection unit main body 9, and has a movable holder 7 that can move in the horizontal direction in the figure at the tip. When carrying out the UT inspection, a thin long rectangular tube can part 1 as a measurement object is installed between the fixed holder 6 and the movable holder 7.

  On the lower surface of the flaw detection unit main body 9, there are also a longitudinal probe unit 10 for flaw detection of the longitudinal butt weld 1C and the U-bend corner 1D, and a circumferential probe unit for flaw detection of the entire butt weld. 11 is fixed. The circumferential direction probe unit 11 is a thin long rectangular tube can part in which a thin long rectangular tube can part 1 which is an object to be measured is welded with a rectangular tube having a different thickness at the end. Used when 1.

  The longitudinal probe unit 10 is used while being moved in the longitudinal direction of the flaw detection unit main body 9 in FIG. 1, so that it is fixed to a part of the moving means 60 (attachment part 61) and reciprocates. . In contrast, the circumferential probe unit 11 is fixed to the flaw detection unit main body 9 because the distance from the end of the thin long rectangular tube can part 1 that is the object to be measured is determined in many cases. It only has to be installed.

  In addition, the flaw detection unit body 9 includes a slide cylinder 8 for moving the movable holder 7 left and right, a fixed holder 6 and a chain 21 for rotating the movable holder 7, a rotation motor 22, a moving means 60, and the like. Is provided. In addition, manual rollers 5 are installed at both ends of the container of the water tank 4.

  FIG. 4 shows a specific structure of the probe unit attached to the flaw detector main body 9. The upper part 30 of the probe unit 11 is fixed to the lower part of the flaw detection part main body 9, and the probe unit 10 is fixed to a part of the moving means 60 (attachment part 61) movable in the longitudinal direction of FIG. It is reciprocated. An elevating cylinder 15 is provided in the hanging portion of the probe unit, and a distance H between the lowermost resin roller 14 of the probe unit is variably adjusted.

  The lifting cylinder 15 is connected to the base plate 12 via a pin joint 17. Two ultrasonic probes 16 (16A, 16B) are attached to the base plate 12 and the rotary stage 13. In FIG. 4, the dotted line indicates the position of the ultrasonic probe 16 in the state of being rotated by the rotary stage 13. The ultrasonic probe 16 (16A, 16B) can be set to an arbitrary angle by rotating the rotary stage 13.

  Three resin rollers 14 are arranged on the lower surface of the base plate 12 so as to follow the surface to be measured of the object 1 to be measured, and the ultrasonic incident surface of the object 1 to be measured and the resin roller 14 are in contact with each other. It is possible to stably run while following the wave of the measurement object incident surface. Further, the elevating cylinder 15 and the base plate 12 are fastened by a pin joint 17, and the base plate 12 tilts following the wave of the incident surface, so that the incident angle can always be kept constant. In this way, the base plate 12 is fastened to the tip of the lifting cylinder 15 by the pin joint 17, and the lifting cylinder 15 is fixed to the UT device flaw detection unit main body 9.

  The UT inspection apparatus according to the present invention is configured as shown in FIG. 1, and detects a longitudinal butt weld 1C and a U-shaped bent corner 1D of the thin long rectangular tube can part 1 shown in FIG. Furthermore, flaw detection is performed on the butt all-around weld. A series of procedures for this inspection will be described below.

  First, as a setup before the flaw detection work, an object to be measured in which the external setup is completed and water does not enter inside with the manual rollers 5 installed in advance at both ends of the water tank 4 in FIG. 1 is mounted on the drawn manual roller 5.

  The operator inserts one end shaft 3 of the sealing instrument 2 shown in FIG. 3 at one end of the DUT 1 into a fixed holder 6 fixed to the flaw detection unit main body 9. Inside the fixed holder 6 is a hole having the same diameter as the shaft 3 of the sealing device 2. After inserting the shaft 3, the fixed holder 6 and the pin 50 are used by using the through hole 31 of the shaft 3. Let them conclude.

  Next, the operator inserts one end shaft 3 of the sealing device 2 shown in FIG. 3 at the other end of the DUT 1 into the movable holder 7 fixed to the flaw detection unit main body 9. For this purpose, the movable holder 7 side is configured as follows. First, the movable holder 7 is provided at the distal end of the right object support mechanism 41B fixed to the lower surface of the flaw detection unit main body 9 so as to be movable in the horizontal direction in the figure.

  In the normal state, the movable holder 7 is pressed by a spring force or the like and is positioned in the left direction in the figure. However, in order to avoid interference with the measured object 1 when the measured object 1 is set up or moved. The cylinder 8 can be slid. For example, when the operator pushes the slide cylinder 8 on the flaw detection unit main body 9 to the right side in the figure. The movable holder 7 connected and fixed to this also moves to the right.

  The other end of the DUT 1 is attached to the movable holder 7 slid leftward by the slide cylinder 8 and the other shaft 3 of the sealing device 2 shown in FIG. It is inserted and fastened to the movable holder 7 in the same manner as the fixed holder 6. As a result, the DUT 1 is fixed to the lower part of the flaw detection unit main body 9 at a predetermined distance.

  On the other hand, probe units 10 and 11 are also installed below the flaw detection unit body 9, and the probe units 10 and 11 are positioned above the object to be measured 1. Thereby, the probe units 10 and 11 and the DUT 1 can be kept in a predetermined positional relationship and a predetermined distance. An example of the probe units 10 and 11 for this purpose is illustrated in FIG. 4 described above.

  Next, the object to be measured 1 is submerged in the water tank 4 filled with water. In order to return the manual roller 5 pulled out for setting to the initial position, the flaw detection unit main body 9 is moved by the main body lifting mechanism 19 fixed to the column 18. Using the lifting motor 20, the manual roller 5 is raised to a position where the upper surface of the manual roller 5 and the lower surface of the DUT 1 are separated, and the manual roller 5 is returned to the initial position. When the obstacle disappears above the water tank 4, the flaw detector main body 9 is lowered using the lifting motor 20 to sink the object 1 to be measured in the water tank 4 filled with water.

  Next, using the longitudinal probe unit 10, flaw detection work is performed on the longitudinal butt weld 1 </ b> C and the U-shaped bending corner 1 </ b> D. The U-shaped bending corner portion 1D is a bending R generated in the process of manufacturing the DUT 1, and a welding line generated by butt welding these two U-shaped materials is a longitudinal butt welding portion 1C. is there. The phases of the long rectangular tube and the short rectangular tube are shifted by 90 °.

  In this case, the lifting cylinder 15 of the longitudinal probe unit 10 is lowered in FIG. 4, and the resin roller 14 is brought into contact with the ultrasonic incident surface of the DUT 1. The longitudinal direction probe unit 10 can be moved at a constant speed in the longitudinal direction of the object 1 to be measured by a moving means 60 (for example, an electric motor), and the long rectangular tube of the object 1 to be measured is about 4300 mm. The ultrasonic probe 16 (16A, 16B) mounted on the crossover longitudinal probe unit 10 travels along the weld line 1C to detect flaws. Similarly, the flaw is detected by running along the fold line 1C. This completes the flaw detection of the longitudinal butt weld 1D and the U-bend corner 1C on the first surface.

  When the flaw detection is completed, the DUT 1 is rotated 180 ° to change the flaw detection surface. The fixed holder 6 and the movable holder 7 have a rotatable structure, and the movable holder 7 is connected to the rotation motor 22 via the chain 21, and the object to be measured is driven by driving the rotation motor 22. Rotate 1 At this time, the longitudinal probe unit 10 is lifted by the lifting cylinder 15 and retracted to a position where it does not come into contact with the DUT 1.

  In a state where the longitudinal direction probe unit 10 is retracted from the measurement object 1, the measurement object 1 is rotated to position the next surface. After the positioning is completed, the longitudinal direction probe unit 10 is lowered by the elevating cylinder 15 and the resin roller 14 is brought into contact with the object 1 to be tested, similarly to the first surface. Similar operations are repeated in the range of about 200 mm of the short rectangular tube of the DUT 1, and all the flaw detections in the longitudinal butt weld 1C and the U-bend corner 1D are completed.

  Next, the butt all-around welded portion is inspected using the circumferential probe unit 11. A butt welded part of the long rectangular tube and the short rectangular tube of the DUT 1 is the object of flaw detection. The circumferential direction probe unit 11 can be driven by an electric motor in a direction parallel to the welding line, but the longitudinal alignment of the butt circumference welding portion of the circumferential direction probe unit 11 is manually operated. To do.

  After the positioning in the longitudinal direction is completed, the circumferential probe unit 11 is fixed, and the circumferential probe unit 11 is moved to a position where a part of the resin roller 14 can come into contact with the incident surface of the DUT 1. Then, the circumferential probe unit 11 is lowered by the lifting cylinder 15. After confirming that the resin roller 14 of the circumferential direction probe unit 11 is in contact with the incident surface of the DUT 1, the circumferential direction probe is measured in a range of about 140 mm in the circumferential direction of the DUT 1. The unit 11 is driven to complete the flaw detection inspection on the first surface.

  Next, in order to change the flaw detection surface, the object to be measured 1 is rotated by 90 °, and flaw detection is sequentially performed on the second surface, the third surface, and the fourth surface by the same method to complete all flaw detection operations. At the time of rotation, the circumferential probe unit 11 is raised by the elevating cylinder 15 and retracted to a position where it does not come into contact with the object 1 to be measured. Is lowered by the lifting cylinder 15. Finally, the flaw detection unit main body 9 is lifted by the lift motor 20 by the lifting mechanism 19 of the flaw detection unit main body 9 fixed to the support column 18, the measured object 1 is pulled up from the water tank 4, and the setup-type manual roller 5 Is pulled out and the object to be measured 1 is lowered onto the manual roller 5, and the process is completed.

  The UT inspection apparatus according to the present invention can perform ultrasonic flaw detection by the water immersion type plate wave method on the butt weld 1C and the U-shaped bending corner 1D of the thin canned rectangular tube can.

  In the UT inspection apparatus according to the present invention, the probe unit fixes the ultrasonic probe to a rotary stage capable of adjusting the angle, and is capable of setting an arbitrary angle, while following the undulation of the incident surface of the object to be measured. It is composed of a copying mechanism for copying. Since the probe unit is made to travel in accordance with the undulation of the surface to be measured, the incident angle and the water distance are always kept constant. Further, since the contact roller that comes into contact with the surface to be measured is made of resin, it is possible to detect a flaw without scratching the object to be measured.

  The body of the probe unit is attached to the tip of the air cylinder 15, and by changing the set value of the supply pressure, the pressing force can be adjusted, and the role of the spring is to cope with the height difference of the object entrance surface. Plays. The air cylinder 15 is also used for retracting the probe unit when rotating the object to be measured.

  The embodiment of the present invention described in detail above has the following characteristics. The UT inspection apparatus includes a longitudinal probe unit for detecting defects in the longitudinal butt weld and U-bend corner of the object to be measured, and a circumferential direction for detecting defects in the butt all-around weld. The device is equipped with a probe unit, and the two units are independent of each other.

  In the flaw detection, a probe unit having a scanning mechanism for keeping the incident angle and water distance constant is caused to travel at a constant speed. Of these, the longitudinal probe unit is composed of two ultrasonic probes for detecting a longitudinal butt weld and two ultrasonic probes for detecting a U-shaped bent corner. The ultrasonic probe is mounted on a rotary stage that can be adjusted to an arbitrary angle.

  In the circumferential direction probe unit, two probes for flaw detection all around the welded portion are attached to the rotary stage. Both probe units are equipped with a scanning mechanism equipped with resin rollers. The probe units follow the wave of the incident surface of the object to be measured, keeping the incident angle and water distance constant. Can be added.

  In addition, an external setup operation is performed as a pre-operation for setting an object to be measured in the UT inspection apparatus. Insert external setup jigs at both ends of the object to be measured, wrap the sealing surface of the object to be measured and the jig with tape and seal it so that water does not enter the inside of the object to be measured. A shaft protrudes from the outer setup jig, and by connecting this shaft and the apparatus main body, it is possible to move up and down and rotate the object to be measured required during the flaw detection process.

1: Measuring object 2: Sealing instrument 3: Shaft 4: Water tank 5: Manual roller 6: Fixed holder 7: Moving holder 8: Slide cylinder 9: Flaw detection unit body 10: Probe unit 11 for longitudinal welding : Probe unit for circumferential welding 12: Base plate 13: Rotating stage 14: Resin roller 15: Lifting cylinder 16: Ultrasonic probe 17: Pin joint 18: Strut 19: Lifting mechanism 20: Lifting motor 21: Chain 22: Rotating motor 30: Probe unit upper part 40: Base 50: Pin

Claims (7)

It is a UT inspection device for a thin-walled square tube long can part formed by bending a plate material into a U-shaped material and welding a butt portion,
A tank installed on the pedestal, a flaw detection unit main body installed between the struts at both ends in the longitudinal direction of the pedestal, and a cover on which the thin-walled rectangular tube tube long can part is fixedly installed at the bottom of the flaw detection unit main body A measurement object support mechanism, a flaw detection unit main body is moved up and down, and an elevating mechanism that guides the thin canned tube-shaped canned parts installed in the measurement object support mechanism into the water tank, and is installed at the bottom of the flaw detection unit main body And a probe unit positioned between the flaw detection unit main body and the thin-walled square tube long can part,
The probe unit includes a base plate and an elevating cylinder connected to the base plate, one of which is fixed to the flaw detection unit body via the elevating cylinder, and the other is a thin long rectangular tube long by a roller provided on the base plate. A UT inspection apparatus characterized in that an ultrasonic probe is rotatably attached to both sides of the roller of the base plate while being able to contact a can-making part. The UT inspection device according to claim 1,
The UT inspection apparatus characterized in that the flaw detector main body is provided with moving means for moving the probe unit in the longitudinal direction of the thin canned tubular tube long can part. The UT inspection device according to claim 1 or 2, wherein
The UT inspection apparatus according to claim 1, wherein the flaw detection unit body includes a rotating means for the thin-walled rectangular tube long can part that changes a surface located on the upper portion of the thin-walled rectangular tube long can part. The UT inspection device according to any one of claims 1 to 3, wherein
Ultrasonic flaw detection is performed on the longitudinal butt welds and U-bend corners of the thin-walled rectangular tube long can parts by means of ultrasonic probes rotatably attached to both sides of the roller. UT inspection device. The UT inspection device according to any one of claims 1 to 4, wherein:
The thin-walled rectangular tube long can part is made by joining two thin-walled square tube long can parts with different thicknesses and welding them all around the circumference, and is attached to both sides of the roller in a rotatable manner. A UT inspection apparatus for ultrasonically detecting a portion welded over the entire circumference of the can part made of a long thin rectangular tube by using an ultrasonic probe. The UT inspection device according to any one of claims 1 to 5, wherein
A UT inspection apparatus characterized in that when the thin-walled rectangular tube tube long can part is fixed to the flaw detection part main body, sealing treatment is performed at both ends thereof to prevent water from entering. The UT inspection device according to any one of claims 1 to 6,
The UT inspection apparatus, wherein the probe unit includes a scanning mechanism for keeping an incident angle and a water distance constant at the time of flaw detection and travels at a constant speed.

Images