JPH0725608Y2 - Weld toe soundness evaluation gauge - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a weld toe soundness evaluation gauge for evaluating the soundness of a welded part based on the shape of the weld toe, and there are variations in evaluation by inspectors. It is designed so that it can be made smaller and lighter.

[Prior Art] In many cases, the fatigue strength of a welded part or a welded structure subjected to cyclic loading is mainly determined by the stress concentration of the welded portion. This stress concentration is generally the shape of the entire welded portion, for example fillet welding. Is determined by the welding leg length a, the flank angle θ, the welding toe b and the undercut curvature radius R shown in FIG.

Therefore, in order to evaluate the soundness of the welded portion, it is effective to inspect the shape of the welded portion, and various methods have been conventionally proposed.

For example, the applicant of the present application has proposed several evaluation sensors for inspecting the shape of the welded part, and one of them is that the quality inspection can be performed following the welding work at the welding site. Japanese Patent Publication No. 61-61913 discloses a sensor for evaluating the soundness of a welded portion from the radius of curvature.

This weld toe fatigue strength soundness evaluation sensor, when the welding conditions such as fillet, butting, and plate thickness are determined, the welding leg length a and the flank angle in actual welding work are determined. Since the variation of θ is in a substantially constant range, if the values of the welding leg length a and the flank angle θ are set in the center of the variation, and the allowable minimum radius of curvature Rmin corresponding to the allowable stress concentration is set in advance. It is based on the recognition that the stress concentration can be determined only by detecting the radius of curvature R of the measured portion.

As shown in FIG. 6, the structure of the fatigue strength soundness evaluation sensor 1 is such that the deviation between the actual curvature radius R at the weld toe 2 and the standard curvature radius Rs formed at the tip of the sensor 1 is the protrusion amount L. The contactor 3 for detecting the change of
It is composed of a pencil-type sensor unit 4 for converting the protrusion amount L into an electric signal, and an electric circuit 5 for calculating a radius of curvature R from an electric signal sent from the sensor unit 4 and issuing an alarm. .

Then, when evaluating the soundness of the weld toe portion 2, as shown in FIG. 7, the pencil-type sensor portion 4 is brought into contact with the weld toe portion 2, and the protrusion amount L of the contactor 3 is adjusted. The soundness is evaluated by the radius of curvature R which is calculated and displayed by the electric circuit 5 based on the above. Then, as shown in FIG. 7 (a), when the protrusion amount L1 of the contactor 3 is as small as 0 and the calculated radius of curvature R1 is larger than a predetermined value, it is determined as sound,
On the contrary, as shown in FIG. 7B, when the protrusion amount L2 of the contactor 3 is large and the calculated curvature radius R2 is smaller than a predetermined value, it is determined that the soundness is poor (welding failure).

[Problems to be Solved by the Invention] In the fatigue strength soundness evaluation sensor 1, since the soundness can be easily evaluated by simply pressing the sensor portion 4 against the welding toe portion 2 which is the portion to be measured, the welding work can be performed. Although it is convenient for use in the field, since the radius of curvature R of the weld toe portion 2 is as small as about 1 mm, depending on how the sensor portion 4 is applied, as shown in FIG. The contact piece 3 may not hit the portion 2 accurately and may hit the welding base metal 6 or the weld bead portion 7. In this case, the protrusion amount L3 of the contact piece 3 becomes small, so that the curvature radius R3 is set to a predetermined value. When the value is larger than the value, it is displayed, and there is a problem that the evaluation of the welded portion is incorrect and sufficient evaluation cannot be performed.

Further, in this fatigue strength soundness evaluation sensor 1, since the absolute value of the radius of curvature R is calculated by the electric circuit 5, the electric circuit 5 portion is considerably large, and the soundness of a narrow welded portion can be evaluated. There is a problem that it causes trouble.

In particular, for welded structures using high-strength steel and welded structures using cryogenic materials, for which the amount of use has recently been increasing, the welding quality directly affects the strength. It is desired to develop a small and lightweight sensor or the like that can evaluate the soundness of welds at various places such as the curvature radius of undercut.

The present invention has been made in view of the problems and the current situation of the prior art, and there is no variation in the evaluation by the inspector, and a small and lightweight weld toe soundness evaluation gauge capable of evaluating the soundness of all weld toes. Is to provide.

[Means for Solving the Problems] In order to solve the problems of the above-mentioned conventional techniques, the weld toe soundness evaluation gauge of the present invention is designed to reduce the gap between the weld toe and the weld base metal. A flank angle gauge plate having a flank angle evaluation part for checking the soundness of the flank angle and a flank angle gauge part formed on the flank angle gauge part are arranged on the bisector of the flank angle evaluation part and can project from the flank angle gauge plate. It is characterized by comprising a radius-of-curvature detector equipped with a slider, and a radius-of-curvature indicator for displaying an abnormality of the radius-of-curvature when the protrusion amount of the slider of the radius-of-curvature detector exceeds a predetermined value. It is a thing.

Further, the weld toe soundness evaluation gauge of the present invention is a flank provided with a slider which can be projected on the flank angle gauge plate so as to detect the size of the gap between the flank angle evaluation portion and the welding base metal. The present invention is characterized in that an angle detector is provided, and a flank angle indicator is provided for displaying an abnormal flank angle when the protrusion amount of the slider of the flank angle detector exceeds a predetermined value.

[Operation] According to this weld toe soundness evaluation gauge, the flank angle evaluation portion of the flank angle gauge plate is applied to the weld toe to determine whether the flank angle is predetermined based on the size of the gap between the weld base metal and the weld toe. As well as checking, it is possible to know whether the protrusion amount of the slider of the curvature radius detector mounted on the bisector of the flank angle evaluation part of this flank angle gauge plate is larger than a predetermined value or not The soundness of the radius of curvature of is evaluated.

Therefore, by fixing the curvature radius detector to the flank angle gauge plate, the inspector can press it against the weld toe or undercut at a predetermined angle to prevent variations by the inspector and to set the predetermined radius of curvature. We are trying to make the device smaller and lighter by making it possible to know the soundness by examining only the size of and.

According to this weld toe soundness evaluation gauge, when the flank angle evaluation part of the flank angle gauge plate is applied to the weld toe and the flank angle is evaluated from the size of the gap with the welding base metal, this gap The size of the flank angle is mechanically detected by a flank angle detector, and it is checked whether or not the amount of protrusion is larger than a predetermined value, and it is possible to judge the appropriateness of the flank angle evaluation part of the flank angle gauge plate to be used. It enables accurate evaluation of the weld toe.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

1 and 2 relate to an embodiment of the weld toe soundness evaluation gauge of the present invention. FIG. 1 is a sectional view and FIG. 2 is an enlarged sectional view of a measuring state.

This weld toe soundness evaluation gauge 10 is provided with a plate-shaped or bevel-shaped flank angle gauge plate 11 made of a plate material having a thickness that allows it to be self-supporting.

The flank angle gauge plate 11 has an angle corresponding to the flank angle θ at which one end (the left end in FIG. 1) of the lower part of the flank angle gauge plate 11 should be evaluated, which is usually the same as the flank angle θ.
Alternatively, the flank angle evaluation part 12 is formed at a slightly smaller angle.

The flank angle evaluation unit 12 of the flank angle gauge plate 11 has a different flank angle evaluation unit 12 depending on the welding conditions because the flank angle θ differs depending on the welding conditions, for example, the angle is 110 degrees, 120 degrees. Prepare things such as degrees and 130 degrees.

Also, the flank angle evaluation unit 12 of this flank angle gauge plate 11
Has a reference arc portion 13 formed in an arc shape, and the radius of curvature of the reference arc portion 13 is the minimum radius of curvature Rm of the welding toe portion 2 which is determined by the welding conditions and which is sound.
in, for example, Rmin = 1 mm.

In such a flank angle gauge plate 11, the radius of curvature Rmin of the reference arc portion 13 and the radius of curvature R of the actual welding toe portion 2 are arranged on the bisector of the angle of the tip of the flank angle evaluation portion 12. A radius-of-curvature detector that detects the deviation as the protrusion amount L of the slider 14.
15 are arranged. The slider 14 of the radius-of-curvature detector 15 is supported in the cylinder body 16 of the radius-of-curvature detector 15 so that it can slide on the bisector of the flank angle evaluation unit 12.

The radius-of-curvature detector 15 electrically detects when the radius of curvature R of the weld toe 2 is smaller than the allowable value from the protrusion amount L of the slider 14 and is not healthy, so that the slider 14 and the cylinder An electrical contact 17 is provided between the body 16 and the body. The electrical contact 17 is, for example, a contact 17a having a sharp tip attached to the slider 14, and a radius of curvature R smaller than an allowable value attached to the cylinder body 16 so that the slider 14 protrudes from a predetermined value. And a large rectangular contact 17b which maintains an electrical connection state when the contact is made.

The electrical contact 17 including the pair of contacts 17a and 17b is connected to the radius-of-curvature indicator 18, and the amplifier 18a obtains a signal when both contacts 17a and 17b are in contact and electrically connected. It is amplified and the fact that the radius of curvature R of the weld toe 2 is not sound is displayed by a display alarm device 18b such as a lamp or a buzzer to give an alarm.

A coil spring 19 is inserted between the slider 14 and the cylinder body 16 so that the slider 14 is always projected.

Further, in the electric contact 17, the contact point 17a on the slider 14 side, the contact point 17b on the cylinder body 16 side, or both of them can be moved by a screw mechanism or the like, so that the weld toe portion 2 is sound. Value of radius of curvature Rmin, that is, both contacts 17a, 17
It is possible to change the value of the protrusion amount L of the slider 14 that comes into contact with b and is brought into electrical contact.

Next, the operation of the weld toe soundness evaluation gauge 10 and the inspection and measurement work of the weld toe 2 will be described below.
Description will be given with reference to the drawings.

First, based on the shape of the weld toe 2 determined by the welding conditions, a flank angle gauge plate 11 in which the angle of the flank angle evaluation unit 12 is slightly smaller than the sound flank angle θ is provided, and the radius of curvature Rmin of the reference arc portion 13 is provided. A weld toe integrity evaluation gauge 10 having, for example, 1 mm is prepared.

The reference arc portion 13 of the flank angle gauge plate 11 of the weld toe soundness evaluation gauge 10 is pressed against the weld toe portion 2 (see FIGS. 2A and 2B).

Frank angle gage plate 11 and actual weld flank angle θ
Visually check the gap X between and.

Then, this gap X has a certain value, for example, the flank angle θ is 2
Confirm that the gap is equivalent to the case where it is smaller by about 5 degrees (for example, about 0.5 mm or less), judge that the flank angle θ is sound, and the flank angle gauge plate 11 for the next measurement of the radius of curvature R. Determined to be appropriate.

In this way, after it is confirmed that the flank angle gauge plate 11 of the weld toe soundness evaluation gauge 10 is appropriate, the curvature radius indicator 18 according to the protrusion amount L of the slider 14 of the curvature radius detector 15
It is understood that the radius of curvature R is sound when the display or the alarm is not made by checking whether or not the display is made.

That is, as shown in FIG. 2 (a), when the radius of curvature R of the weld toe portion 2 is larger than the minimum radius of curvature Rmin that is sound, the slider 14 of the radius of curvature detector 15 projects. Otherwise, the protrusion amount L is smaller than a predetermined value, the contacts 17a and 17b of the electrical contact 17 do not come into contact with each other, and the curvature radius indicator 18
Nothing is displayed on the screen, indicating that it is sound.

On the other hand, as shown in FIG. 2B, when the radius of curvature R of the weld toe portion 2 is smaller than the minimum radius of curvature Rmin that is sound, the slider 14 of the radius of curvature detector 15 is large. Protruding and becoming larger than a predetermined value, the contacts 17a, 17b of the electrical contact 17
A contact occurs between them, and the fact that the radius of curvature indicator 18 is not healthy (unhealthy) is displayed and at the same time an alarm is issued.

As described above, according to the weld toe soundness evaluation gauge 10, the flank angle gauge plate 11 corresponding to the flank angle θ of the weld toe portion 2 is prepared, and the flank angle evaluation of the flank angle gauge plate 11 is performed. Since the radius-of-curvature detector 15 is arranged on the bisector of the portion 12, the slider 14 can always be pressed against the weld toe 2 in a predetermined state, and the variation of the measurement by the operator. It is possible to make an accurate soundness judgment by eliminating.

Further, according to the weld toe soundness evaluation gauge 10, it is possible to easily measure the weld soundness only by pressing against the welding work, and it is possible to perform the inspection in a short time.

Further, since the soundness judgment is made by detecting whether the soundness is within a predetermined soundness value range by the radius of curvature detector 15 and the electric contact 17, the structure can be simplified and the size and weight can be reduced. This makes it possible to easily measure small areas.

By setting the flank angle θ of the flank angle gauge plate to 90 degrees, the flank angle gauge plate can also be used for evaluation of the radius of curvature caused by undercut.

Next, another embodiment of the present invention will be described with reference to FIGS. 3 and 4, but the same parts as those of the embodiment already described will be denoted by the same symbols and description thereof will be omitted.

In this weld toe soundness evaluation gauge 20, it is necessary to check whether the angle of the flank angle evaluation portion 12 of the flank angle gauge plate 11 is appropriate for the flank angle θ determined by the welding condition of the measurement object. Instead of visually observing X, it is possible to judge mechanically.

Therefore, the flank angle gauge plate 11 is provided with a flank angle detector 23 composed of a slider 21 that slides in the horizontal direction and a cylinder body 22.

The configuration of the flank angle detector 23 is the same as that of the radius-of-curvature detector 15 already described, and only the sliding direction of the slider is different.

In this flank angle detector 23, when the protrusion amount Y of the slider 21 exceeds a predetermined value Ymax, for example Ymax = 0.5 mm, and exceeds this value, it is determined that the flank angle gauge plate 11 to be used is unsuitable. In order to be able to display, an electric contact 24 having two contacts 24a, 24b is provided like the curvature radius indicator 18, and the electric contact 24 and the flank angle indicator 25 are connected,
Displays whether the flank angle θ is greater than the predetermined value Ymax,
It is possible to give an alarm.

Note that the other configurations are the same as those of the weld toe integrity evaluation gauge 10 already described.

Next, together with the action of the weld toe soundness evaluation gauge 20 as described above, the inspection and measurement work of the weld toe 2 will be described in the fourth section.
Description will be given with reference to the drawings.

First, based on the shape of the weld toe determined by the welding conditions, the flank angle evaluation part slightly
12 small or same angle flank angle gauge plate 11
A welding toe soundness evaluation gauge 20 is prepared in which the radius of curvature of the reference arc portion 13 is Rmin = 1 mm.

The reference arc portion 13 of the flank angle gauge plate 11 of the weld toe soundness evaluation gauge 20 is pressed against the weld toe portion 2 (fourth).
(See Figures (a) and (b)).

Frank angle gage plate 11 and actual weld flank angle θ
The gap X between and is detected by the flank angle detector 23, and the slider
The suitability of the flank angle gauge plate 11 is judged by the display of the flank angle indicator 25 based on the protrusion amount Y of 21.

-1, that is, the gap X corresponds to a certain value Xmin, for example, when the flank angle θ is small by about 2 to 5 degrees.
Is set to, for example, about 0.5 mm or less, and this value of 0.5 mm is set as the protrusion amount Ymax of the slider 21 as the gap between the contacts 24a and 24b of the electric contact 24. As shown in FIG. 4 (a), the amount of protrusion Y of the slider 21 is small, the electrical contact 24 is not in the connected state, nothing is displayed on the flank angle indicator 25, and the flank angle is not displayed. It can be seen that the angle θ and the flank angle gauge plate 11 are sound.

In this case, the slider 14 of the radius-of-curvature detector 15 is pressed against an appropriate position on the weld toe 2.

-On the other hand, when the gap is larger than the predetermined value Xmin of the gap X, as shown in FIG. 4 (b), the protrusion amount Y of the slider 21 becomes larger than Ymax and the electric contact 24 is connected. The state is displayed, the alarm is displayed on the flank angle display 25, and an alarm is issued, so that the unsoundness of the flank angle θ and the improperness of the flank angle gauge plate 11 can be known.

In this case, since the angle of the flank angle evaluation unit 12 is too small, the slider 14 of the radius-of-curvature detector 15 does not contact the proper position of the welding toe portion 2 and the protrusion amount of the slider 14 is increased. It is possible to prevent the sound radius from being displayed although L is small and the actual radius of curvature R is smaller than the predetermined value Rmin.

For the measurement of the radius of curvature R after it is confirmed that the flank angle gauge plate 11 of the weld toe soundness evaluation gauge 20 is appropriate in this way, for example, the maximum value Lmax of the protrusion amount L of the slider 14 is set to, for example, It may be set to 0.1 mm, and the procedure may be performed as already described, and the description thereof will be omitted.

As described above, according to the weld toe soundness gauge 20, the flank angle θ of the weld toe 2 and the allowable minimum radius of curvature are
A flank angle gauge plate 11 corresponding to Rmin is prepared, and the suitability of this flank angle gauge plate 11 can be displayed by the flank angle detector 23 and the flank angle indicator 25. Since the radius-of-curvature detector 15 is arranged on the bisector of the evaluation unit 12, the slider 14 can always be pressed against the welding toe 2 in a predetermined state, and the operator can measure A more accurate soundness judgment can be made by completely eliminating the variation.

Further, according to the weld toe soundness evaluation gauge 20, it is possible to easily measure the weld soundness only by pressing against the welding work, and it is possible to perform the inspection in a short time.

Furthermore, according to this weld toe soundness evaluation gauge 20,
Radius of curvature detector 15 and electrical contact 17 and flank angle detector
Since the limit value is detected by the 23 and the electrical contact 24, the structure can be simplified, the size and weight can be reduced, and even when it is not possible to directly see the gap in the measurement of a narrow area, it is easy. And accurate measurement and inspection can be performed.

Further, even when two sliders are used, by setting the flank angle θ of the flank angle gauge plate to 90 degrees, it is possible to evaluate the radius of curvature caused by undercut.

The present invention is not limited to the configuration of the above-described embodiment, and each constituent element may be modified within the scope of the invention.

[Effects of the Invention] As described above in detail with reference to the embodiments, according to the weld toe soundness evaluation gauge of the invention, a flank angle gauge plate, a curvature radius detector, and a curvature radius indicator are provided. Since the flank angle gauge plate is applied with the flank angle evaluation part to the weld toe, it is possible to check whether the flank angle is predetermined from the size of the gap with the welding base metal. Evaluate the soundness of the radius of curvature of the weld toe or undercut by knowing whether the protrusion amount of the slider of the curvature radius detector mounted on the bisector of the flank angle evaluation part of is larger than a predetermined value. can do.

Therefore, the radius of curvature detector fixed to the flank angle gauge plate allows the inspector to press it against the weld toe at a predetermined angle to prevent variation by the inspector, and to compare the radius of curvature with the predetermined value. By checking only this, it is possible to reduce the size and weight of the device without needing a computing unit or the like.

Further, according to this weld toe soundness evaluation gauge, in addition to the above-mentioned configuration, a flank angle detector is provided on the flank angle gauge plate, and a flank angle indicator is provided.
When the flank angle evaluation part of the flank angle gauge plate is applied to the weld toe to evaluate the flank angle, the size of the gap with the weld can be detected with the flank angle detector and displayed on the flank angle indicator. The suitability of the angle of the flank angle evaluation part of the flank angle gauge plate to be used can be mechanically determined, and the soundness of the weld toe can be evaluated more accurately.

Further, since it is not necessary to evaluate the suitability of the flank angle gauge plate from the gap, it is possible to easily evaluate the weld toe part of the particularly narrow portion.

[Brief description of drawings]

1 and 2 relate to an embodiment of the weld toe soundness evaluation gauge of the present invention. FIG. 1 is a sectional view and FIG. 2 is an enlarged sectional view of a measuring state. 3 and 4 relate to another embodiment of the weld toe soundness evaluation gauge of the present invention, and FIG. 3 is a sectional view, FIG.
The figure is an enlarged cross-sectional view of the measurement state. FIG. 5 is an explanatory diagram of an object to be evaluated by the device gauge. 6 and 7 are a sectional view and an enlarged sectional view of a conventional example. 10: weld toe soundness evaluation gauge, 11: flank angle gauge plate, 12: flank angle evaluation portion, 13: reference arc portion, 14: slider, 15: radius of curvature detector, 16: cylinder body, 17 : Electric contact, 18: Curvature radius indicator, 19: Coil spring. 20: weld toe soundness evaluation gauge, 21: slider, 22: cylinder body, 23: flank angle detector, 24: electrical contact, 25: flank angle indicator. 2: Weld toe, θ: flank angle, R: radius of curvature, Rmin: sound minimum radius of curvature, L: amount of protrusion, X: gap, Xmin: allowable gap, Y: amount of protrusion, Ymax: appropriate The projected amount.

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. A flank angle gauge plate provided with a flank angle evaluation part for checking the soundness of the flank angle from the size of a gap between the weld toe part and the welding base material, and the flank angle gauge plate. And a radius-of-curvature detector provided with a slider that is arranged on the bisector of the flank-angle evaluation unit and can project from the flank-angle gauge plate, and the amount of protrusion of the slider of the radius-of-curvature detector has a predetermined value. A weld toe soundness evaluation gauge comprising a radius of curvature indicator that indicates an abnormality in the radius of curvature when it exceeds. 2. The flank angle gauge plate is provided with a flank angle detector equipped with a slider capable of projecting so as to detect the size of the gap between the flank angle evaluation portion and the welding base metal. The weld toe soundness evaluation gauge according to claim 1, further comprising a flank angle indicator for indicating an abnormal flank angle when the protrusion amount of the slider of the vessel exceeds a predetermined value.