JPH09325131A - Magnetizing device for flaw-probing fillet welding part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable accurate defect inspection by providing a pair of angle type iron cores, connected with a connection part, in parallel, winding a coil around a leg part facing both sides of welding part for allowing switching of energizing direction, and allowing it to run along the welding part. SOLUTION: Angle type iron cores 21 and 22 assigned in parallel, of a magnetic field generating means 11, are connected with a connecting part 23. The iron cores 21 and 22 are provided with horizontal leg parts 21a and 22a and vertical leg parts 21b and 22b facing a side plate 52 and a bottom plate 51, respectively, and they are wound with coils C1-C4 for annular connection. Side surface and bottom surface running means 14 and 13 make wheels 42 and 33 contact to the side plate 51 and the bottom plate 52, respectively, and the interval between the means 11 and the side plate 51 and the bottom plate 52 is kept constant for movement. A switch 27 of a magnetic field switching means 12 is turned to automatic so that energizing direction of the coils C1-C4 is automatically switched, for a facing fillet welding part 53 to be magnetized. At the same time, a flaw-detecting range is irradiated with ultraviolet rays from an ultraviolet lamp 17, and a magnetic powder liquid containing fluorescence material applied on the welding part 53 emits light, for definite recognition of defect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetizing device for fillet weld flaw detection suitable for defect inspection of fillet welds such as oil storage tanks.

[0002]

2. Description of the Related Art For example, as a defect inspection apparatus for fillet welds such as oil storage tanks, a magnetizing device for flaw detection of fillet welds has been proposed in Japanese Utility Model Publication No. 1-36122. As shown in FIGS. 6 and 7 of the publication, this magnetizing apparatus for flaw-filled portion flaw detection has a channel-shaped iron core 2 and one leg of each channel-shaped iron core 2 having one leg. 2, two angle-shaped iron cores 1a and 1b magnetically insulated from each other and attached in the vertical direction, and channel-shaped iron cores 2 and coils 5, 4a and 4b wound around the angle-shaped iron cores 1a and 1b. There is. In addition, this magnetizing device for flaw detection of fillet welds,
Switches S1, S connected to each coil 4a, 4b, 5
2 is provided. Then, the switches S1 and S2 are operated to generate a magnetic field in two directions orthogonal or parallel to the fillet weld portion 9.

In this magnetizing device for flaw-filled portion flaw detection, since the distance between the legs in the longitudinal direction of the welded portion 9 is wide, the inspection portion can be viewed with certainty and the direction of the magnetic field can be switched so that the entire device can be rotated, for example. It is not necessary to do so, and the excitation range is further widened, which has the advantage of improving work efficiency.

[0004]

However, in the above-mentioned magnetizing device for flaw fill weld flaw detection, the channel-shaped iron core 2 has two legs and the angle-shaped iron cores 1a and 1b have four legs. Since there are individual legs, the inspection result may be inaccurate when the angle between the side plate 7 and the bottom plate 8 forming the both side surfaces of the fillet weld 9 changes.

This is because the angle between the side plate 7 and the bottom plate 8 is a set value,
This is because, for example, when the angle is different from 90 °, any two of the six leg portions are floated and it becomes impossible to generate a predetermined magnetic force in the fillet welded portion 9.

An object of the present invention is to solve such a problem, and flaw detection of a fillet weld portion which enables accurate defect inspection even if the angles of both side surfaces of the fillet weld portion change. The present invention is to provide a magnetizing device.

[0007]

The present invention is a magnetizing device for flaw fill weld flaw detection, which is configured as follows to solve the above-mentioned technical problems. That is, the magnetizing device for flaw fill weld flaw detection of the present invention is such that the pair of angle-shaped iron cores having leg portions to be opposed to both sides of the fillet weld portion are arranged in parallel at a predetermined interval, and Angle-shaped iron cores are connected by a connecting portion, magnetic field generating means in which a coil is wound around the leg portion, and magnetic field switching means for switching the direction of the magnetic field generated in the magnetic field generating means by switching the energization method for the coil, And a traveling unit capable of traveling the magnetic field generation unit along the fillet weld. Hereinafter, each component will be described. (Magnetic Field Generating Means) As the magnetic field generating means targeted by the magnetizing device for flaw fill weld flaw detection of the present invention, a pair of angle-shaped iron cores form four legs facing each other on both sides of the fillet weld. At the same time, it can be configured by connecting the angle-shaped iron cores at the connecting portions and further winding the coils around the leg portions. The angled iron core and the connecting portion can be formed of a soft magnetic material such as a silicon steel plate. (Magnetic field switching means) As the magnetic field switching means, a normal changeover switch can be used. (Running means) As a running means, a wheel is attached to each leg of the magnetic field generating means, and when the wheel is in contact with both side surfaces of the fillet weld, the clearance between each leg and both side surfaces has a predetermined size. It can be configured to hold. (Additional Structure in the Present Invention) The magnetizing device for fillet weld flaw detection according to the present invention is composed of the above-described essential components, but is also established when the following components are added in addition to these components. The constituent element is to include gap adjusting means for adjusting the gap between the facing surface and at least one of the leg portions of the angled iron core when no magnetic field is generated in the magnetic field generating means. Further, a magnetic powder liquid removing means for removing the magnetic powder liquid accumulated in the fillet weld can be provided. Further, the magnetic particle liquid removing means may be a blower.

In the magnetizing device for flaw-filled portion flaw detection of the present invention, the magnetic field generating means is provided with four legs, and two pieces are attracted to each side surface of the fillet-welded portion. It is possible to prevent the legs from floating even if they change, and thereby a predetermined magnetic force can be generated in the fillet weld. Also,
Since the leg portions having a predetermined distance are arranged in the longitudinal direction of the defect inspection area, the defect inspection area can be visually observed in a wide field without being blocked. Further, since the magnetic field switching means can generate magnetic fields in two directions with respect to the fillet weld, it is not necessary to change the direction of the magnetic field generating means. Further, since the traveling means is provided, the magnetic field generating means can be easily moved along the fillet weld.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The magnetizing device for flaw fill weld flaw detection according to the present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows a magnetizing device 1 for flaw detection of fillet welds according to the present invention. The magnetizing device 1 for flaw fill weld flaw detection is
For example, it is suitable for the defect inspection of the fillet welded portion 53 formed at the connecting portion between the bottom plate 51 and the side plate 52 of the oil storage tank 50, and the magnetic field generating means 11 for generating a magnetic field and the magnetic field generated by the magnetic field generating means 11. And a magnetic field switching means 12 for switching the direction.

The magnetizing device 1 for flaw detection of the fillet welded portion
Is a bottom surface traveling means 13 and a side surface traveling means 14 for causing the magnetic field generating means 11 to travel along the longitudinal direction of the fillet welded portion 53.
And a magnetic particle liquid removing means 15 for removing the magnetic particle liquid 55 (FIG. 8) accumulated in the fillet weld portion 53. Support plates 16 are erected on both side surfaces of the magnetic field generating means 11 in the traveling direction, an ultraviolet irradiation lamp 17 is attached to an intermediate portion thereof, and a handle 18 is provided on an upper end portion thereof.

In the magnetic field generating means 11, a pair of angle-shaped iron cores 21 arranged in parallel at a predetermined interval,
22 are connected by a connecting portion 23. The angled iron cores 21 and 22 and the connecting portion 23 are made of a soft magnetic material such as a silicon steel plate. Angle type iron cores 21 and 2
2 has horizontal leg parts 21a and 22a which should oppose the side plate 52, and vertical leg parts 21b and 22b which should oppose the bottom plate 51. These horizontal leg parts 21a and 22 and the vertical leg part 21.
b and 22b have coils C1, C2, C3 and C respectively.
4 are wound. Each coil C1, C2, C3, C4
Are connected annularly as shown in FIGS. 2 and 4.

In FIG. 1, the magnetic field switching means 12 is
By switching the energization method for each of the coils C1 to C4 as described below, each leg 21a, 21b, 22a,
The direction of the magnetic field generated at 22b is switched. The magnetic field switching means 12 has a control box 26, inside which various control circuits (not shown) are provided.

Further, on the surface of the control box 26, an automatic / manual switch 27 for selecting whether the magnetic field direction is automatically switched or manually switched, a magnetic field switch 28 for switching the magnetic field direction in the manual switching mode, A longitudinal magnetic field indicator lamp 29 which lights up when a magnetic field parallel to the fillet weld 53 is generated, and a transverse magnetic field indicator lamp 30 which lights up when a magnetic field perpendicular to the fillet weld 53 occurs
Also, a switch 47 for the ultraviolet irradiation lamp 17 is provided. The switch 47 is connected to a power supply device (not shown) in the control box 26.

Now, when the automatic / manual changeover switch 27 is switched to the automatic side, as shown in FIG. 2, a predetermined point is provided between the connection midpoint between the coils C1 and C3 and the connection midpoint between the coils C2 and C4. Is energized for time t1. As a result, as shown in FIG.
2 horizontal legs 21a, 22a and vertical legs 21b, 22b
A magnetic field is generated between and. This magnetic field is applied to the fillet weld 53
Is substantially perpendicular to the longitudinal direction of.

When the time t1 elapses, the energizing method is automatically switched, and as shown in FIG.
2 is energized for a predetermined time t2 between the midpoint of connection with 2 and the midpoint of connection of coil C3 and coil C4. As a result, as shown in FIG. 5, between the horizontal leg portions 21a and 22a of the respective angle-shaped iron cores 21 and 22, and between the vertical leg portions 21b and 22.
A magnetic field is generated during b. This magnetic field is applied to the fillet weld 53
Is substantially parallel to the longitudinal direction of.

As shown in FIG. 1, in the bottom traveling means 13, the vertical leg portions 21b of the angle-shaped iron cores 21 and 22,
A lever 31 made of a non-magnetic material is rotatably attached to the rod 22b by a pin 32, and a wheel 33 capable of traveling on the bottom plate 51 is rotatably attached to one end of the lever 31.
On the other hand, a tension spring 35 having a predetermined tension is attached to the upper side of the vertical legs 21b and 22b via a mounting plate 34, and the tip end of the tension spring 35 is locked to the other end of the lever 31. . As a result, the wheels 33 are constantly urged toward the bottom plate 51.

Further, a plate 36 with a screw hole is provided above the lever 31, and a locking bolt 37 is screwed into the screw hole. The bottom surface of the wheel 33 and the vertical leg portions 21 b and 22 are formed by the plate 36 with screw holes and the locking bolts 37.
Gap adjusting means 38 for adjusting the gap with the bottom surface of b is configured.

That is, the tip of the lever 31 is urged upward by the tension spring 35, and the lever 31 stops at the position where it abuts the lower end surface of the locking bolt 37. At this time, the distance between the bottom surface of the wheel 33 and the bottom surfaces of the vertical leg portions 21b and 22b, that is, the bottom plate 51 and the vertical leg portions 21b and 22b.
The screwing length of the locking bolt 37 is adjusted so that the clearance α (FIG. 6) with b becomes a predetermined dimension.

In the side traveling means 14, a lever 40 made of a non-magnetic material is rotatably attached to the horizontal leg portions 21a, 22a of the angle-shaped iron cores 21, 22 with a pin 41,
A wheel 42 capable of traveling on a side plate 52 at one end of the lever 40
Is rotatably attached. Horizontal legs 21a, 2
A tension spring 44 having a predetermined tension is attached to the base side of 2a via a mounting plate 43, and the tip of the tension spring 44 is attached to the other end of the lever 40. As a result, the wheels 42 are constantly urged toward the side plate 52.

A stopper 45 for restricting the rotation angle of the lever 40 is provided on the side of the lever 40, and the distance between the outer end surface of the wheel 42 and the outer end surfaces of the legs 21b and 22b, that is,
The gap β (FIG. 6) between the side plate 52 and the legs 21b and 22b is maintained at a predetermined size.

The magnetic particle liquid removing means 15 is for removing the magnetic particle liquid 55 (FIG. 8) accumulated in the fillet welded portion 53.
For example, a blower such as a hair dryer can be used. A flexible hose 46 of an appropriate length is connected to the magnetic particle liquid removing means 15, and the flexible hose 4
The magnetic powder liquid 55 is blown away by the wind sent from 6.

Next, the operation of the magnetizing device 1 for flaw fill weld flaw detection will be described. First, a defect inspection range for detecting defects in the fillet welded portion 53 is set, and the magnetic field generating means 11 is arranged in accordance with the defect inspection range. In this case, the wheels 33 of the bottom surface traveling means 13 and the side surface traveling means 1 as shown in FIG.
The four wheels 42 are brought into contact with the bottom plate 51 and the side plate 52, respectively. Thereby, the vertical leg portion 21 of the magnetic field generating means 11 is
The clearance α between the b and 22b and the bottom plate 51 is maintained at a predetermined dimension, and the clearance β between the horizontal leg portions 21a and 22a and the side plate 52 is also maintained at a predetermined dimension.

In this state, the automatic / manual switch 27 of the magnetic field switching means 12 is switched to the automatic side. Then, as described above, between the horizontal leg portions 21a and 22a and the vertical leg portions 21b and 22b of the magnetic field generation means 11, a magnetic field perpendicular or horizontal to the fillet weld 53 is automatically switched and generated. The fillet weld 53 is magnetized by this magnetic field. Further, the switch 47 of the ultraviolet irradiation lamp 17 in the control box 26 of the magnetic field switching means 12 is preliminarily set.
By putting in, ultraviolet rays are emitted from the ultraviolet ray irradiation lamp 17 to the defect flaw detection range.

Then, as shown in FIG. 7, the magnetization generating means 1
The horizontal legs 21a and 22a of No. 1 adsorb | suck to the side plate 52 against the biasing force of the tension spring 44 (FIG. 1). Similarly, the vertical legs 21b and 22b are attracted to the bottom plate 51 against the biasing force of the tension spring 35 (FIG. 1). As a result, the fillet weld 53
Is magnetized to a predetermined strength.

With the fillet weld 53 magnetized, a flaw detection magnetic powder solution is applied to the flaw detection area. This magnetic powder liquid
It is made by mixing magnetic powder such as iron powder with fluorescent material and putting it in water. At this time, if the fillet weld 53 has a defect in a direction intersecting with the direction of the magnetic field, a leakage magnetic flux is generated and the magnetic powder in the magnetic powder liquid is agglomerated and adhered to the surface, and the defect shape is a magnetic powder pattern. Appears.

Then, the fluorescent material in the magnetic powder is irradiated with the ultraviolet rays of the ultraviolet ray irradiation lamp 17 to emit light, so that the shape of the defect can be clearly recognized by visual observation, and the defect of the fillet weld portion 53 can be surely achieved. It becomes possible to detect flaws. In addition,
Defect flaw detection can be performed while switching the automatic / manual switch 27 to the manual side as necessary and switching the magnetic field switch 28 to switch the direction of the magnetic field.

When defect inspection is performed using the magnetic powder liquid 55 as described above, if there is a recess 54 between the fillet weld 53 and the bottom plate 51 as shown in FIG. 55 may accumulate. Then, even if there is a defect on the lower side of the accumulated magnetic powder 55, it may not be confirmed. Therefore, in such a case, the magnetic particle liquid removing means 1
5 (FIG. 1) is driven to blow air from the flexible hose 46, and the magnetic powder 55 can be blown away and removed by this wind. Thereby, the defect hidden by the magnetic powder liquid 55 can be confirmed.

In this way, when the defect inspection of the set defect inspection range is completed, the handle 18 is grasped and the wheels 33 of the bottom surface traveling means 13 and the wheels 42 of the side surface traveling means 14 are brought into contact with the bottom plate 51 and the side plate 52, respectively. In this state, the fillet weld magnetizing device 1 for flaw detection along the longitudinal direction of the fillet weld 53
To move. Then, the magnetization generating means 11 is aligned with the next defect inspection range and stopped, and defect inspection is performed in the same manner as described above.

In the magnetizing device 1 for flaw fill weld flaw detection, the gap between the vertical legs 21b and 22b and the bottom plate 51 is adjusted by changing the height of the wheel 33 of the bottom traveling means 13 by the gap adjusting means 38. Therefore, even if the angle θ between the bottom plate 51 and the side plate 52 is smaller than the set angle of, for example, 90 ° for some reason as shown in FIG. 9, defect inspection can be reliably performed.

That is, in this case, as shown in the figure, by adjusting the screwing lengths of the locking bolts 37 of the clearance adjusting means 38 arranged on both sides of the vertical leg portions 21b, 22b, both sides of the vertical leg portions 21b, 22b are adjusted. The step h of the wheel 33 of the bottom surface traveling means 13 is adjusted so that the minimum clearance α between the bottom surface of the vertical leg portions 21b and 22b and the bottom plate 51 is set to a predetermined dimension. Thereby, when a magnetic field is generated in the magnetic field generating means 11, the vertical leg portions 21b,
Since 22b is surely adsorbed to the bottom plate 51, a predetermined magnetic force is generated in the fillet welded portion 53, and defect inspection can be accurately performed.

As described above, the magnetizing device 1 for flaw fill weld flaw detection has two vertical leg portions 21b and 22b and two horizontal leg portions 21a and 22a, which face the bottom plate 51 and the side plate 52, respectively. Further, since the clearance α between the vertical leg portions 21b and 22b and the bottom plate 51 and the clearance β between the horizontal leg portions 21a and 22a and the side plate 52 are maintained at a predetermined size, the leg portions 21b and 22 are respectively.
bottom plate 51 or side plate 5 without b, 21a, 22a floating
It surely adsorbs to 2. Therefore, a predetermined magnetic force is generated in the fillet weld portion 53, and defect inspection can be accurately performed.

Further, since the pair of angle-shaped iron cores 21 and 22 of the magnetization generating means 11 have a predetermined interval and are arranged on both sides in the longitudinal direction of the defect inspection area, the defect inspection area is blocked. It becomes possible to visually observe in a wide field of view.

Furthermore, since the magnetic field generating means 11 can generate magnetic fields in two directions, flaws in all directions can be detected without changing the direction of the magnetic field generating means, and the bottom surface traveling means 13 and side surface traveling are possible. Since the magnetic field generating means 11 can be easily moved along the fillet welded portion 53 by the means 14, the operability is improved.

In the above-described embodiment, when the angle α between the bottom plate 51 and the side plate 52 becomes smaller than the set angle, the gap α between the vertical legs 21b and 22b and the bottom plate 51 is adjusted by the adjusting means 38. About the horizontal leg 21
a and 22a are provided with gap adjusting means to provide horizontal leg portions 21a, 2a.
It is also possible to adjust the gap β between the 2a and the side plate 52, or to adjust both gaps α and β.

[0036]

As described above, according to the magnetizing device for flaw fill weld flaw detection of the present invention, four leg portions are provided by the pair of angle-shaped iron cores of the magnetic field generating means, and the fillet weld portion Since two legs are adsorbed on each side, it is possible to prevent the legs from floating from the flat surface even if the angles on both sides change, which allows the fillet weld to have a predetermined magnetic force. It is possible to accurately detect defects by generating a defect.

Further, since the leg portions are arranged at both ends of the defect inspection area in the longitudinal direction, the defect inspection area can be visually observed in a wide field without being blocked. Furthermore, since the magnetic field switching means can generate magnetic fields in two directions with respect to the fillet weld, defect inspection can be performed without changing the direction of the magnetic field generating means, and the traveling means can change the magnetic field generating means. Since it can be easily moved along the fillet weld, operability is improved.

Further, since the gap adjusting means for adjusting the gap between each leg of the magnetic field generating means and the traveling surface is provided, even if the angles of both side surfaces of the fillet welded portion are changed, these planes and each leg are also changed. It is possible to maintain a constant gap between the leg and the leg, so that each leg can be reliably attracted to a flat surface and a predetermined magnetic force can be generated in the fillet weld, so flaw detection can be performed accurately. Will be possible.

Further, since the magnetic powder liquid removing means for removing the magnetic powder liquid accumulated in the welded portion is provided, it is possible to prevent defects from being hidden by the magnetic powder liquid and becoming undetectable.
Further, the magnetic particle liquid removing means may be a blower, which allows the device to be inexpensively constructed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetizing apparatus for flaw detection of a fillet weld portion according to the present invention.

FIG. 2 is a diagram showing a connection of coils.

FIG. 3 is a diagram showing a magnetic field perpendicular to the longitudinal direction of a fillet weld.

FIG. 4 is a diagram showing switching of energization methods for coils.

FIG. 5 is a diagram showing a magnetic field parallel to the longitudinal direction of the fillet weld.

FIG. 6 is a view on arrow A in FIG.

FIG. 7 is a diagram showing a state in which the legs of the magnetic field generating means are attracted to the bottom plate and the side plate.

FIG. 8 is a diagram showing a method of removing magnetic powder liquid.

FIG. 9 is a diagram for explaining the operation of the gap adjusting means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetizing device for flaw fill weld flaw detection 11 Magnetic field generating means 12 Magnetic field switching means 13 Bottom surface traveling means 14 Side surface traveling means 15 Magnetic powder liquid removing means 21, 22 Angle type iron cores 21a, 22a Horizontal leg portions 21b, 22b Vertical leg portion 23 Connection Part 38 Gap adjusting means 51 Bottom plate 52 Side plate 53 Fillet welded part 55 Magnetic liquid C1-C4 coil α Gap between vertical leg and bottom plate β Gap between horizontal leg and side plate

Claims (4)

[Claims] 1. A pair of angled iron cores having leg portions to be opposed to each other on both side surfaces of a fillet welded portion are arranged in parallel at a predetermined interval, and the angled iron cores are connected by a connecting portion, A magnetic field generating means in which a coil is wound around the leg portion, a magnetic field switching means for switching the energizing method for the coil to switch the direction of the magnetic field generated in the magnetic field generating means, and the magnetic field along the fillet weld portion. A magnetizing device for fillet weld flaw detection, comprising: traveling means capable of traveling the generating means. 2. A gap adjusting means for adjusting a gap between at least one of the leg portions and the facing surface of the angled iron core when a magnetic field is not generated in the magnetic field generating means. 1. A magnetizing device for fillet weld flaw detection according to 1. 3. A magnetic particle liquid removing means for removing magnetic powder liquid accumulated in the fillet welded portion is provided.
Alternatively, the magnetizing device according to claim 2 for flaw detection of a fillet weld. 4. The magnetizing device for fillet weld flaw detection according to claim 3, wherein the magnetic particle liquid removing means is a blower.