JPH10282070A - Ultrasonic automatic flaw inspection apparatus for welded part of fin of boiler panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic automatic flaw inspection apparatus for a welded part of a fin of a boiler panel which can efficiently inspect a penetration amount at the welded part of the fin of the boiler panel in a nondestructive manner thereby contributing to quality improvement of a product. SOLUTION: A probe holder 7, a rotary driving device 6 and a base member 5 are inserted from an end part of a tube 2. A clamping device 4 is fixed to the end part of the tube 2, and an ultrasonic probe 8 is arranged at a required position in an axial direction of the tube 2 to be inspected. A contact catalyst 10 is supplied from a contact catalyst feed device 9 to between the ultrasonic probe 8 of the probe holder 7 and an inner circumferential face of the tube 2. In this state, the probe holder 7 is rotated at a predetermined speed by the rotary driving device 6, thereby carrying out an ultrasonic flaw detection. An incomplete penetration amount at a welded part of a fin 3 of a boiler panel 1 is measured on the basis of a position in a circumferential direction of the rotary driving device 6 and detected echoes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic ultrasonic inspection apparatus for inspecting fin welds of a boiler panel.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 10, a boiler panel 1 constituting a furnace wall of a boiler is formed by fillet-welding a fin 3 to a pipe 2. If the amount of penetration at the weld is small, a small gap is formed between the pipe 2 and the fins 3 and the thermal conductivity decreases, affecting the efficiency of the boiler. There is a need to.

For this reason, conventionally, a sample of the boiler panel 1 has been cut in a direction perpendicular to the axis of the tube 2 and the cut surface has been polished. The penetration amount at the welded portion of the fin 3 was confirmed.

[0004]

However, as described above, when a macro structure inspection of a sample of the boiler panel 1 is performed, an actual product cannot be checked because of a destructive inspection that requires cutting of the tube 2. In addition, there is a drawback that the inspection takes time.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is capable of nondestructively and efficiently inspecting the penetration amount in a fin weld portion of a boiler panel, and contributing to improvement of product quality. An object of the present invention is to provide an ultrasonic automatic flaw detection apparatus.

[0006]

SUMMARY OF THE INVENTION The present invention provides a clamp device mounted on an end of a tube of a boiler panel, and a clamp device attached to the clamp device so as to be adjustable in the axial direction of the tube of the boiler panel, and the clamp device of the boiler panel. A base member inserted into the inside of the tube, a rotation driving device attached to a distal end portion of the base member, and an ultrasonic probe that is rotatably disposed around the axis of the tube by the rotation driving device and that is provided inside the tube. A probe holder mounted so as to face the peripheral surface, and a couplant supply device for supplying a couplant between the ultrasonic probe of the probe holder and the inner peripheral surface of the tube are provided. The present invention relates to an ultrasonic automatic flaw detector for a fin weld of a boiler panel.

According to the above means, the following effects can be obtained.

When inspecting the penetration amount at the fin welded portion of the boiler panel, first, the probe holder, the rotation drive device, and the base member are inserted from the end of the tube.
After the clamp device is fixed to the end of the tube, the base member is slid with respect to the clamp device in the axial direction of the tube, if necessary, the position is adjusted, and the ultrasonic probe is to be inspected. At the required position in the axial direction.

Subsequently, in a state where the couplant is supplied between the ultrasonic probe of the probe holder and the inner peripheral surface of the tube from the couplant supply device, the probe holder is rotated at a predetermined speed by the rotation driving device. When ultrasonic waves are emitted from the ultrasonic probe toward the inner peripheral surface of the tube while rotating, the echo reflected on the inner and outer peripheral surfaces of the tube and returned to the ultrasonic probe is detected, and the rotation drive is performed. Based on the circumferential position of the device and the detected echo,
The penetration shortage in the fin weld of the boiler panel is measured.

When the probe holder makes one rotation inside the tube by the rotary driving device, the position of the base member with respect to the clamping device in the axial direction of the tube is changed, and the ultrasonic probe is to be inspected next to the tube. After disposing at the required position in the axial direction, the same operation as described above is performed to measure the insufficient penetration amount at the fin welding portion at another portion of the boiler panel.

As a result, it is not necessary to perform the macro structure inspection of the sample of the boiler panel as in the prior art, and it is possible to check the actual product without cutting the pipe, and the inspection time is shortened.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 9 show an embodiment of the present invention. In the drawings, reference numeral 4 denotes a clamp device attached to an end of a tube 2 of a boiler panel 1; 1 is a tubular base member which is mounted so as to be adjustable in the axial direction of the tube 2 and is inserted into the tube 2 of the boiler panel 1. A driving device 7 is arranged so as to be rotatable about the axis of the tube 2 by a rotation driving device 6 and a probe holder 9 on which an ultrasonic probe 8 is mounted so as to face the inner peripheral surface of the tube 2. This is a couplant supply device that supplies a couplant 10 such as water between the ultrasonic probe 8 of the probe holder 7 and the inner peripheral surface of the tube 2.

As shown in FIGS. 2 to 4, the clamp device 4 is provided at a plurality of positions (in the illustrated example, three positions in the circumferential direction) of a cylindrical clamp body 4a which can be fitted at one end to the end of the tube 2. Location)
, A chuck claw member 4c having a tapered surface 4b formed on the outer peripheral surface thereof is pivotally attached thereto, and the claw member 4c is wedge-fastened by a fastening jig 4d screwed to one end of the clamp body 4a. The clamp body 4a is pressed against the outer peripheral surface of the end of the tube 2 by utilizing the effect, whereby the clamp body 4a is fixed to the end of the tube 2, and the other end of the clamp body 4a is screwed. The base member 5 is attached to the support member 4e
And the position of the base member 5 in the axial direction of the tube 2 can be adjusted by tightening a set screw 4f for positioning.
In FIG. 2, reference numeral 26 denotes a support frame fixed to the distal end of the base member 5 and supporting the rotary driving device 6.

As shown in FIGS. 5 and 6, the probe holder 7 has a stabilizer 7b which can be replaced according to the inner diameter of the tube 2 at both ends in the longitudinal direction of the holder body 7a. The ultrasonic probe 8 is embedded, and a couplant channel 13 for ejecting the couplant 10 from an outlet 12 is formed on the inner peripheral surface of the tube 2 facing the ultrasonic probe 8. The ultrasonic flaw detection cable 14 connected to the ultrasonic probe 8 is rotatably driven by the rotation driving device 6 (see FIG. 1). A supply pipe 16 connected to the ultrasonic flaw detector 15 (see FIG. 1) and connected to the couplant passage 13 penetrates through the inside of the base member 5 and is connected to the couplant supply device 9. A pump 9c described below
(See FIG. 1).

As shown in FIG. 1, the couplant supply device 9 includes a tank 9a storing a couplant 10 such as water, and a pump 9c driven by a motor 9b. , The couplant 10 in the tank 9a is pumped up by the pump 9c, and the opening degree of the flow rate regulating valves 19 and 20 is adjusted. Road 1
3 is supplied with a required amount of the couplant 10 and excess couplant 10 is returned to the tank 9a via the bypass pipe 21.

As shown in FIG. 1, the ultrasonic flaw detector 15 transmits an ultrasonic wave to the ultrasonic probe 8 via an ultrasonic flaw detection cable 14, and the inner and outer peripheral surfaces of the tube 2 and a portion where penetration is insufficient. The echo is reflected from the ultrasonic probe 8 and returned to the ultrasonic probe 8 to receive and process the data. The rotary driving device 6 is controlled by a predetermined signal based on a driving signal 22 from the control device 17. The rotation is controlled at the speed. The circumferential position signal 23 of the rotation driving device 6 output from the control device 17 and the ultrasonic detection signal 24 processed and output by the ultrasonic flaw detector 15 are output. Are input to the recorder 25 and are automatically recorded.

Next, the operation of the illustrated example will be described.

When inspecting the penetration amount at the fin 3 welding portion of the boiler panel 1, first, the clamping jig 4d screwed to one end of the clamp body 4a of the clamp device 4 is loosened. The probe holder 7, the rotation driving device 6, and the base member 5 are inserted from the end of the tube 2, and one end of the clamp body 4 a is fitted to the end of the tube 2. The claw member 4c is pressed against the outer peripheral surface of the end of the tube 2 by using the wedge effect by the
After fixing the base member 5 to the end of the tube 2, the base member 5 inserted into the support member 4 e of the clamp body 4 a is slid in the axial direction of the tube 2 as necessary, and a set screw for positioning is used. 4f, the position of the base member 5 in the axial direction of the tube 2 is adjusted, and the ultrasonic probe 8
Is disposed at a required position in the axial direction of the pipe 2 to be inspected.

Subsequently, the drive signal 18 from the control device 17
The motor 9b is driven on the basis of the flow rate, and the couplant 10 in the tank 9a is pumped by the pump 9c.
By adjusting the openings 9 and 20, a required amount of the couplant 1 is supplied to the couplant channel 13 of the probe holder 7 through the supply pipe 16.
0, and the excess couplant 10 is returned to the tank 9 a via the bypass pipe 21, and the probe is driven by the rotary drive device 6 driven based on the drive signal 22 from the control device 17. Ultrasonic waves are transmitted from the ultrasonic flaw detector 15 to the ultrasonic probe 8 via the ultrasonic flaw detection cable 14 while rotating the holder 7 at a predetermined speed. When you emit ultrasonic waves toward the circumference,
The echoes reflected by the inner and outer peripheral surfaces of the tube 2 and returned to the ultrasonic probe 8 are received by the ultrasonic flaw detector 15 to process the data, and the rotation driving device 6 output from the control device 17. Circumferential position signal 23 and the ultrasonic flaw detector 1
The ultrasonic detection signal 24 processed and output in step 5 is input to a recorder 25 and automatically recorded, and the boiler panel 1
From the presence or absence of an echo from the outer peripheral surface of the pipe 2 at the fin 3 weld and the reception width, the insufficient penetration amount at the fin 3 weld is measured.

For example, when the penetration amount at the fin 3 welding portion of the boiler panel 1 is sufficient and complete,
As shown in FIG. 7, a part of the ultrasonic waves emitted from the ultrasonic probe 8 at the welded portion of the fin 3 is reflected on the inner peripheral surface of the tube 2 and returns to the ultrasonic probe 8. 7, the waveform is detected as a waveform indicated by S 1, and the others are transmitted from the thick portion of the pipe 2 to the fin 3 through the fin 3 welded portion. , B1
The waveform is not detected in the portion of.

When the width of insufficient penetration at the fin 3 welding portion of the boiler panel 1 is large, as shown in FIG.
A part of the ultrasonic waves emitted from the ultrasonic probe 8 at the fin 3 welding portion is reflected on the inner peripheral surface of the tube 2 and returns to the ultrasonic probe 8 in the same manner as described above. The waveform is detected as a waveform indicated by S1, but otherwise reflected from the thick portion of the pipe 2 at the wide penetration insufficient portion of the fin 3 welding portion and returns to the ultrasonic probe 8, so that ultrasonic flaw detection is performed. By the processing of the detection data in the detector 15, a high waveform is detected in the portion B1 in FIG. Thus, the boiler panel 1
When the insufficient penetration width at the fin 3 weld is large, the waveform at the portion B1 indicates that the pipe 2 other than the fin 3 weld is
Is substantially equal to the waveform of the echo reflected and detected on the outer peripheral surface of the.

Further, when the shortage of penetration at the fin 3 weld portion of the boiler panel 1 is small, as shown in FIG. 9, of the ultrasonic waves emitted from the ultrasonic probe 8 at the fin 3 weld portion, A part is reflected on the inner peripheral surface of the tube 2 and returns to the ultrasonic probe 8 in the same manner as described above, and is detected as a waveform indicated by S1 in FIG. Since the light is reflected by the narrow penetration insufficient portion of the welded portion of the fin 3 and returns to the ultrasonic probe 8 from the portion, processing of the detection data by the ultrasonic flaw detector 15 causes the portion B1 in FIG. It will be detected as a low waveform.

The waveform indicated by T in FIGS. 7, 8 and 9 is a transmission pulse appearing when an ultrasonic wave is output from the ultrasonic flaw detector 15, and is a reference for the ultrasonic flaw detection waveform. The waveform indicated by S2 is reflected on the inner peripheral surface of the tube 2 and returns to the ultrasonic probe 8, and is reflected by the ultrasonic probe 8 and again inside the tube 2. This represents the ultrasonic wave that has returned to the ultrasonic probe 8 after being reflected on the peripheral surface.

The probe holder 7 is driven by the rotation driving device 6.
After one rotation of the inside of the tube 2, the set screw 4f is loosened, and the base member 5 inserted through the support member 4e of the clamp body 4a is slid in the axial direction of the tube 2 by a required amount.
By retightening the set screw 4f, the position of the base member 5 in the axial direction of the tube 2 is changed, and the ultrasonic probe 8 is arranged at a required position in the axial direction to be inspected next to the tube 2, and By performing the same operation, the penetration shortage at the fin 3 weld is measured from the presence or absence of an echo from the outer peripheral surface of the pipe 2 at the fin 3 weld at another part of the boiler panel 1 and the reception width. Is done. However, the rotation direction of the probe holder 7 by the rotation driving device 6 is reversed every rotation by the operation of a proximity switch (not shown), and thereby, the ultrasonic flaw detection cable 14 and the supply pipe are provided. 16 prevents excessive twisting.

As a result, it is not necessary to perform the macro structure inspection of the sample of the boiler panel 1 as in the prior art, and it is possible to check the actual product without cutting the pipe 2, and the inspection time can be shortened.

In this way, the amount of penetration at the fin 3 welding portion of the boiler panel 1 can be inspected nondestructively and efficiently, thereby contributing to the improvement of product quality.

It should be noted that the ultrasonic inspection apparatus for ultrasonically inspecting fin welds of a boiler panel according to the present invention is not limited to the above-described example, and various modifications may be made without departing from the scope of the present invention. Obviously you can get it.

[0029]

As described above, according to the ultrasonic automatic flaw detection system for fin welds of a boiler panel according to the present invention, the penetration amount in the fin welds of a boiler panel is inspected nondestructively and efficiently. This can provide an excellent effect that it can contribute to the improvement of product quality.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of an example of an embodiment of the present invention.

FIG. 2 is a sectional view of a clamp device according to an example of an embodiment of the present invention.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 2;

FIG. 5 is a side view of a probe holder according to an example of an embodiment of the present invention.

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5;

FIG. 7 is a schematic diagram showing an ultrasonic signal transmission / reception state and an ultrasonic flaw detection waveform when the penetration amount in the fin welding portion of the boiler panel is sufficient and complete in an example of an embodiment of the present invention.

FIG. 8 is a schematic diagram illustrating an ultrasonic signal transmission / reception state and an ultrasonic flaw detection waveform in a case where a penetration depth of a fin weld portion of a boiler panel is large in an example of an embodiment of the present invention.

FIG. 9 is a schematic diagram showing an ultrasonic signal transmission / reception state and an ultrasonic flaw detection waveform when an insufficient penetration width at a fin weld portion of a boiler panel is small in an example of an embodiment of the present invention.

FIG. 10 is a sectional view of a boiler panel formed by welding fins to a pipe.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 boiler panel 2 tube 3 fin 4 clamp device 5 base member 6 rotation drive device 7 probe holder 8 ultrasonic probe 9 couplant supply device 10 couplant 15 ultrasonic flaw detector 17 controller 23 circumferential position signal 24 Ultrasonic detection signal 25 Recorder

Claims (1)

[Claims] 1. A clamp device attached to an end of a tube of a boiler panel, and a base member attached to the clamp device so as to be adjustable in the axial direction of the tube of the boiler panel and inserted into the tube of the boiler panel. A rotary drive device attached to the tip of the base member, and the rotary drive device is arranged to be rotatable about the axis of the tube, and the ultrasonic probe is mounted so as to face the inner peripheral surface of the tube. A fin welded part for a boiler panel, comprising: a probe holder; and a couplant supply device for supplying a couplant between the ultrasonic probe of the probe holder and the inner peripheral surface of the tube. Ultrasonic flaw detection equipment.