Leg length measurement device

Abstract

To provide a leg length measurement device capable of enabling easy reading of measurement results and preventing a decrease in measurement accuracy.SOLUTION: A leg length measurement device 1 is used for measuring a leg length S of a weld bead B formed between a first steel plate P1 and a second steel plate P2. The leg length measurement device 1 includes: a measurement unit 2 having a slide gauge 3 and a measurement main body 4 configured to detect the sliding amount of the slide gauge 3; and a base 5 having a contact surface 51a that comes into surface contact with a main surface P21 of the second steel plate P2, the base 5 being configured to hold the measurement unit 2 such that, when the contact surface 51a is in surface contact with the main surface P21 of the second steel plate P2, the slide gauge 3 is slidable parallel to the main surface P21 of the second steel plate P2. The base 5 includes a positioning part 52c that contacts a second end T2 of the weld bead B to position the reference position of the slide gauge 3, and the measurement main body 4 includes a numeric display 44 configured to numerically display the sliding amount of the slide gauge 3 on a display surface parallel to the contact surface 51a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a leg length measurement device, and more particularly to a leg length measurement device equipped with a numerical display. [Background technology]

[0002] Fillet welding, which welds the inside corner of two mutually perpendicular welding surfaces, has been widely used. In particular, fillet welding is widely used for T-joints, in which the end face of one base material (steel plate) is welded to the main surface of the other base material (steel plate). After the welding work is completed, the leg length of the weld (weld bead) is measured. The leg length refers to the dimension between the root (base end) of the weld bead, called the root, and the toe (the point where the weld surface intersects with the surface of the weld bead). The leg length required to ensure weld strength is predetermined by standards for each thickness of the steel plate being welded. Therefore, workers measure the leg length after the welding work is completed and compare the measured value with the standard value to confirm that the quality standards are being met.

[0003] Patent Document 1 describes a universal gauge that can measure the dimensions of a weld. Specifically, the universal gauge has a scale that indicates the leg length, and the leg length of the weld can be efficiently measured by sliding the leg length gauge with the bottom and side edges of the universal gauge in contact with the base metal and visually reading the scale when it comes into contact with the weld. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Microfilm of Utility Model Application No. 52-099790 (Utility Model Application No. 54-027641) Summary of the Invention [Problem to be solved by the invention]

[0005] Although the universal gauge described in Patent Document 1 can efficiently measure the leg length of a weld, it has the following problems. When measuring the leg length, workers must read the small graduations displayed on the universal gauge, which can be difficult for workers with poor eyesight to read. Furthermore, when measuring the leg length, the universal gauge must be held perpendicular to the root and toe of the weld bead that extends along the joint of the base metal, which can lead to a decrease in measurement accuracy if the universal gauge is not held perpendicular.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a leg length measurement device that allows measurement results to be easily read and prevents a decrease in measurement accuracy. [Means for solving the problem]

[0007] The above-mentioned problem is solved by a leg length measurement device of the present invention, which provides a leg length measurement device for measuring the leg length of a weld formed by fillet welding between one welding surface and the other welding surface, the device comprising: a measurement unit having a sliding body that slides when operated to slide; and a measurement main body that slidably supports the sliding body and detects a sliding distance of the sliding body; and a base that has an abutment surface that comes into surface contact with the one welding surface and holds the measurement unit so that the sliding body can slide parallel to the one welding surface when the abutment surface comes into surface contact with the one welding surface, the base having a positioning part that abuts against the toe of the weld and that positions a reference position of the sliding body, and the measurement main body having a numerical display that displays the sliding distance of the sliding body between the reference position and the other welding surface on a display surface parallel to the abutment surface.

[0008] According to the above configuration, the measurement main body has a numerical display that displays the measured leg length numerically. Therefore, the worker can easily read the numerically displayed leg length compared to reading a scale with a small display. In addition, the measured leg length is displayed on a display surface parallel to the contact surface. Therefore, the worker can visually check the display surface to confirm that the leg length measurement device is being held perpendicular to the root and toe of the weld bead, and can correct the posture of the leg length measurement device as necessary. This makes it possible to prevent a decrease in measurement accuracy due to the leg length measurement device not being held perpendicular.

[0009] Preferably, the sliding body has a first protruding portion protruding in the sliding direction, the positioning portion has a second protruding portion protruding in the sliding direction, and the first protruding portion and the second protruding portion are positioned so as to overlap each other when viewed from a direction perpendicular to the contact surface when the sliding body is positioned at the reference position. According to the above configuration, by aligning the tip of the second protrusion with the measurement position of the weld, it is possible to easily measure the leg length at the measurement position.

[0010] Preferably, the first protruding portion and the second protruding portion have tapered portions that become thinner toward the tip in the sliding direction. According to the above configuration, it is possible to measure the leg length by accurately aligning the second protrusion with the measurement position of the welded portion.

[0011] Preferably, the first protruding portion has a first tip surface on which a flat surface perpendicular to the sliding direction is formed, and an extension portion interposed between the tapered portion and the first tip surface and extending toward the sliding direction, and the second protruding portion has a second tip surface on which a flat surface perpendicular to the sliding direction is formed. According to the above configuration, the first protruding portion and the second protruding portion have first and second tip surfaces, respectively, on which flat surfaces perpendicular to the sliding direction are formed, so that the tip of the first protruding portion and the tip of the second protruding portion can be accurately aligned.

[0012] The sliding body may have an operation knob extending in a direction perpendicular to the contact surface, and may slide when the operation knob is slid. According to the above configuration, the sliding body has an operation knob that extends in a direction perpendicular to the contact surface, which prevents the hand from interfering with the welding surface when sliding the sliding body, and makes it possible to easily operate the operation knob while viewing the display surface that is parallel to the contact surface.

[0013] The base may also have a scale marking that allows dimensions to be measured visually. According to the above configuration, the base has a scale marking that allows dimensions to be measured visually, so that the worker can measure the dimensions of the base material along with the leg length, making it possible to efficiently confirm that the weld meets predetermined quality standards. [Effects of the Invention]

[0014] According to the leg length measurement device of the present invention, the measurement results can be easily read and a decrease in the accuracy of leg length measurement can be prevented. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of the leg length measurement device during measurement of leg length. [Figure 2] FIG. 2 is a perspective view of a leg length measurement device in which a slide gauge protrudes from a measurement main body. [Figure 3] FIG. 1 is a perspective view of a leg length measurement device in which a slide gauge is housed in a measurement main body. [Figure 4] FIG. 2 is a front view of the leg length measurement device. [Figure 5] FIG. 2 is a side view of the leg length measurement device. [Figure 6] FIG. 2 is a rear view of the leg length measurement device. [Figure 7] FIG. 2 is a diagram illustrating a functional configuration of the leg length measurement device. [Figure 8] FIG. 10 is a side view of the leg length measurement device during leg length measurement. [Figure 9]FIG. 1 is a front view of the leg length measurement device during leg length measurement. [Figure 10] FIG. 10 is a side view of the leg length measurement device measuring the thickness of a steel plate. DETAILED DESCRIPTION OF THE INVENTION

[0016] A leg length measurement device 1 according to one embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to Figures 1 to 10. However, the embodiment described below is merely an example to facilitate understanding of the present invention and is not intended to limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and of course, the present invention also includes equivalents thereof.

[0017] The leg length measurement device 1 is used to measure the leg length S of a fillet weld, and has a numeric display 44 that displays the measured leg length S as a numerical value. Therefore, the worker can easily read the measured leg length S by visually checking the numeric display 44. In addition, by visually checking the numeric display 44, the worker can simultaneously confirm that the leg length measurement device 1 is being held in an appropriate position relative to the weld bead B. Therefore, it is possible to prevent a decrease in measurement accuracy caused by measuring the leg length S with the leg length measurement device 1 in an inappropriate position.

[0018] In the following description, the vertical direction refers to the direction in which the slide gauge 3 slides to measure the leg length S of the weld bead B, and refers to the vertical direction in Figure 3. The left-right direction refers to the left-right direction as seen from the worker, which is perpendicular to the vertical direction. The front-rear direction refers to the direction perpendicular to the vertical and left-right directions, and refers to the direction perpendicular to the plane of the paper in Figure 3.

[0019] <Outline of fillet welding and leg length measurement> First, fillet welding and the leg length S of the weld bead B (corresponding to the welded portion) will be described. Fillet welding is welding performed on the inside corner of two weld surfaces. Below, we will explain using as an example a T-joint in which the end surface P22 of the second steel plate P2 is welded to the main surface P11 of the first steel plate P1.

[0020] 1 shows a state in which an end surface P22 of a second steel plate P2 is fillet-welded to a main surface P11 of a first steel plate P1. A weld bead B is formed along the joint between the main surface P11 of the first steel plate P1 and the end surface P22 of the second steel plate P2. The weld bead B has a base end called a root R (the intersection of the main surface P11 of the first steel plate P1 and the main surface P21 of the second steel plate P2) and a toe TP. Hereinafter, the point where the surface of the weld bead B intersects with the main surface P11 of the first steel plate P1 will be referred to as a first toe TP1, and the point where the surface of the weld bead B intersects with the main surface P21 of the second steel plate P2 will be referred to as a second toe TP2.

[0021] The leg length S refers to the dimension between the root R and the toe TP. After completing the welding work, the worker measures the leg length S and compares it with a predetermined reference value to confirm that the quality standard for fillet welds is met. Specifically, the worker uses the leg length measuring device 1 to measure the leg length S and the plate thickness T of the first steel plate P1 or the plate thickness T of the second steel plate P2, and compares the measured value with a predetermined reference value for each plate thickness T to control the quality of the fillet welds.

[0022] Specifically, the worker brings the contact surface 51a of the base 5 into surface contact with the main surface P21 of the second steel plate P2, and brings the protrusion 52 of the base 5, which will be described later, into contact with the second toe TP2 of the weld bead B. Next, the worker slides the slide gauge 3 to bring it into contact with the main surface P11 of the first steel plate P1, and measures the leg length S by reading the measurement value displayed on the numeric display 44. Furthermore, while reading the measurement value, the worker can also check whether the leg length measurement device 1 is held so that the sliding direction of the slide gauge 3 is perpendicular to the direction in which the root R and the second toe TP2 extend (the left-right direction in FIG. 1). Specifically, the worker can check that the leg length measurement device 1 is held so that the angle A1 shown in FIG. 1 is 90 degrees. This makes it possible to prevent a decrease in measurement accuracy due to the leg length measurement device 1 being held in an inappropriate position (a position inclined from the angle A1 of 90 degrees) with respect to the root R and the second toe TP2. The main surface P21 of the second steel plate P2 corresponds to one welding surface, and the main surface P11 of the first steel plate P1 corresponds to the other welding surface.

[0023] <Leg length measurement device 1> The leg length measurement device 1 will be described with reference to Fig. 2 to Fig. 6. Fig. 2 is a perspective view showing a state in which the protruding portion 31 of the slide gauge 3 protrudes forward from the measurement main body 4, and Fig. 3 is a perspective view showing a state in which the protruding portion 31 of the slide gauge 3 is housed in the sliding guide hole 43 of the measurement main body 4. Fig. 4 is a view of the leg length measurement device 1 as seen from the front. Fig. 5 is a view of the leg length measurement device 1 as seen from the side. Fig. 6 is a view of the leg length measurement device 1 as seen from the back. The leg length measurement device 1 mainly comprises a measurement unit 2 that measures the leg length S, and a base 5 that holds the measurement unit 2 and is brought into contact with the main surface P21 of the second steel plate P2.

[0024] <Measurement Unit 2> The measurement unit 2 has a slide gauge 3 that slides when operated to slide, and a measurement main body 4 that slidably supports the slide gauge 3 and detects the amount of sliding (corresponding to the sliding distance) of the slide gauge 3. The measurement unit 2 measures the leg length S by measuring the amount of sliding of the slide gauge 3 that is operated to slide between the root R and the toe TP of the weld bead B.

[0025] The slide gauge 3 has a protrusion 31, a slide plate 32, and an operation knob 33, and slides in the slide direction (up and down direction) while being guided by a slide guide hole 43 formed in the measurement main body 4. The slide gauge 3 corresponds to a slider. The slide gauge 3 is displaceable in the vertical direction between a protruding position (see FIG. 2) where the protruding portion 31 protrudes from the slide guide hole 43 and a retracted position (see FIG. 3) where the protruding portion 31 is retracted into the slide guide hole 43. In FIGS. 4 to 6, the solid line indicates the slide gauge 3 positioned in the protruding position, and the two-dot chain line indicates the slide gauge 3 positioned in the retracted position.

[0026] The protrusion 31 has a tapered portion 31a that tapers toward the tip in the sliding direction (downward), a flat tip surface 31c, and an extension portion 31b that is interposed between the tapered portion 31a and the tip surface 31c (see Figures 2, 4, and 5). Specifically, the tapered portion 31a tapers downward in the left-right direction. This allows the protrusion 31 to be accurately aligned with the measurement position MP of the weld bead B. The protrusion 31 corresponds to a first protrusion.

[0027] Furthermore, a flat surface perpendicular to the vertical direction is formed on the tip surface 31c of the protrusion 31. Therefore, it is possible to start measuring the leg length S by positioning the tip surface 31c of the slide gauge 3 at the same vertical position as a tip surface 52b of a protrusion 52 of the base 5, which will be described later. The tip surface 31c corresponds to a first tip surface.

[0028] Furthermore, the extension 31b extends vertically without tapering toward the tip, which allows the worker to easily confirm that the leg length measurement device 1 is being held so that the slide gauge 3 slides in a direction (vertical direction) perpendicular to the direction (horizontal direction) in which the root R and toe TP of the weld bead B extend.

[0029] The sliding plate portion 32 is a plate material having a shape and dimensions corresponding to the sliding guide hole 43 formed in the measurement main body portion 4. The sliding plate portion 32 is guided along the sliding guide hole 43, so that the slide gauge 3 slides smoothly in the vertical direction.

[0030] The operation knob 33 is a gripping knob that extends in the front-to-rear direction (a direction perpendicular to the contact surface 51a described later). The slide gauge 3 slides relative to the measurement main body 4 by sliding the operation knob 33 up and down. Because the operation knob 33 extends in the front-to-rear direction, the operator can operate the slide gauge 3 without his or her hand interfering with the base material. The dimensions and shape of the operation knob 33 are not limited to those shown in the figure. It is sufficient that the operation knob 33 has dimensions and a shape that allow the slide gauge 3 to be slid up and down.

[0031] The measurement main body 4 has a housing 41 and a tip 42 connected to the front of the housing 41. A sliding guide hole 43 is formed in the housing 41 and the tip 42 so as to penetrate in the vertical direction, and accommodates the slide gauge 3 in a slidable manner. The housing 41 is provided with a numeric display 44 that displays the measurement result of the leg length S as a numeric value, a power button 45, a reset button 46, and an auxiliary button 47.

[0032] The numeric display 44 is a seven-segment display having LEDs (Light Emitting Diodes) arranged in seven segments, and numerically displays the leg length S measured by a detection sensor 48 (see FIG. 6 ), which will be described later. This allows the worker to read the measurement result of the leg length S more easily than with a conventional scale display. Note that the numeric display 44 is not limited to a seven-segment display. It may also be a dot matrix display as long as it can numerically display the measurement result of the leg length S. The numeric display 44 may also be a liquid crystal display.

[0033] The power button 45 is a push button that is operated to start or stop the supply of electrical energy to a detection sensor 48, a measurement control unit 49 (see FIG. 6), and the numeric display 44, which are built into the housing 41. The detection sensor 48 and the measurement control unit 49 will be described later. The reset button 46 is a push button that is operated when the tip surface 31c of the slide gauge 3 is positioned at the same position as the tip surface 52b of the base 5, in order to reset the sliding amount (protrusion amount) of the slide gauge 3.

[0034] The auxiliary button 47 is a push button that is operated to fix (hold) the display output to the numeric display 44. However, the function of the auxiliary button 47 is not limited to this. The auxiliary button 47 may also be operated to fix (hold) the physical position of the slide gauge 3 in the up-down direction relative to the measurement main body 4. The auxiliary button 47 may also be operated to perform setting operations for the leg length measurement device 1.

[0035] <Platform 5> The base 5 has a contact surface 51a that is brought into surface contact with the welding surface (for example, the main surface P21 of the second steel plate P2), and holds the measurement unit 2. The base 5 has a main body 51 , a protrusion 52 , and a scale 53 .

[0036] The main body 51 has a generally rectangular parallelepiped shape and includes a contact surface 51a that contacts the welding surface, and a side surface 51b. The contact surface 51a and the side surface 51b are flat surfaces. The contact surface 51a is brought into contact with the welding surface in parallel. By bringing the contact surface 51a into surface contact with the main surface P21 of the second steel plate P2, the slide gauge 3 is supported so as to slide in parallel to the main surface P21 of the second steel plate P2. Furthermore, by bringing the contact surface 51a into surface contact with the main surface P21 of the second steel plate P2, the worker can visually check the numeric display 44 from the front and at the same time hold the leg length measurement device 1 so that the slide gauge 3 slides up and down. This allows the leg length S to be measured and the posture of the leg length measurement device 1 to be adjusted simultaneously, making it possible to prevent a decrease in measurement accuracy.

[0037] The side surface 51b is provided with a scale 53. Therefore, as will be described later with reference to Fig. 10, an operator can measure the plate thickness T of the first steel plate P1 and the second steel plate P2 by abutting the abutting surface 51a against the end surface P12 of the first steel plate P1 or the end surface P22 of the second steel plate P2. It is preferable that the scale 53 is provided with numbers as large as possible that can be displayed on the scale 53. This makes it possible to improve the readability of the scale 53 for an operator. The scale 53 corresponds to a scale display.

[0038] Protrusion 52 protrudes downward (in the sliding direction of slide gauge 3) from main body 51. Protrusion 52 has a tapered portion 52a that tapers toward the tip, and a tip surface 52b that has a flat surface (see FIG. 6). More specifically, tapered portion 52a tapers in the left-right direction toward the tip. This makes it possible to accurately align tip surface 52b with the measurement position MP of weld bead B. Protrusion 52 corresponds to the second protrusion, and tip surface 52b corresponds to the second tip surface and the positioning portion.

[0039] Furthermore, a flat surface perpendicular to the vertical direction is formed on the tip surface 52b of the protrusion 52. Therefore, by positioning the tip surface 52b of the protrusion 52 and the tip surface 31c of the protrusion 31 at the same vertical position (storage position) and operating the reset button 46, the leg length S can be accurately measured. Furthermore, with the slide gauge 3 positioned at the stowed position, the contact surface 51a is brought into contact with the welding surface and the tip surface 52b is brought into contact with the toe TP, thereby positioning the tip surface 31c of the slide gauge 3 at the reference position. In this specification, the reference position means the measurement start point corresponding to the route R or the toe TP. In measuring the leg length S, which will be described later with reference to Figures 8 and 9, the position equivalent to the second toe TP2 in the vertical direction is set as the measurement start point (reference position), and the leg length S is measured after the tip surface 31c of the slide gauge 3 is positioned at the position equivalent to the second toe TP2.

[0040] <Functional configuration of leg length measurement device 1> Next, the functional configuration of the leg length measurement device 1 will be described. Fig. 7 shows the functional configuration of the leg length measurement device 1. As shown in Fig. 7, the leg length measurement device 1 mainly includes a measurement control unit 49 that controls measurement of the leg length measurement device 1, a detection sensor 48, a power button 45, a reset button 46, an auxiliary button 47, and a numeric display 44.

[0041] The detection sensor 48 is a capacitance type encoder that detects the amount of sliding (corresponding to the sliding distance) of the slide gauge 3, but is not limited to this. The detection sensor 48 may also be an optical encoder. The amount of sliding of the slide gauge 3 detected by the detection sensor 48 is output to the measurement control unit 49.

[0042] The power button 45 is a push button that is operated to supply or stop the supply of electrical energy output from a battery (not shown) to other electrical components. The battery is a button battery built into the housing 41, but is not limited to this. The battery may also be a secondary battery that can be charged externally.

[0043] The reset button 46 is a push button that is operated to initialize and reset the sliding amount of the slide gauge 3. When the reset button 46 is operated, the storage position of the slide gauge 3 is acquired based on the output signal of the detection sensor 48 and stored in the volatile memory or nonvolatile memory of the measurement control unit 49.

[0044] The auxiliary button 47 is a push button that is operated to fix (hold) for a predetermined time the display on the numeric display 44. When the auxiliary button 47 is operated, the slide amount output by the detection sensor 48 at that time is stored in the volatile memory of the measurement control unit 49, and the slide amount stored in the volatile memory is output to the numeric display 44 continuously for a predetermined time. However, the auxiliary button 47 may also be operated to perform various settings for the leg length measurement device 1.

[0045] The numeric display 44 is a known seven-segment display that displays the slide amount (leg length S) output by the measurement control unit 49. The numeric display 44 may also have a backlight, which makes it possible to easily read the measurement results even when the leg length measurement device 1 is used in a dark environment.

[0046] The measurement control unit 49 is a control circuit having a processor, a volatile memory, and a nonvolatile memory. The processor executes the process of measuring the leg length S by loading and executing a program stored in the nonvolatile memory. Specifically, the measurement control unit 49 acquires the output signal of the detection sensor 48 and outputs the measurement value (leg length S) to the numeric display 44. The measurement control unit 49 may also store the output signal of the detection sensor 48 in a volatile memory and output the past measurement value stored in the volatile memory to the numeric display 44. The measurement control unit 49 may also output the maximum, minimum, or average value of the past measurement values ​​stored in the volatile memory to the numeric display 44.

[0047] <How to use the leg length measurement device 1> Next, how to use the leg length measurement device 1 will be described. FIG. 8 is a side view of the leg length measurement device 1 when measuring the leg length S, and FIG. 9 is a front view of the leg length measurement device 1 when measuring the leg length S. The following description will be given on the assumption that the slide amount of the slide gauge 3 has already been initialized. More specifically, the tip surface 31c of the slide gauge 3 is positioned at the same vertical position as the tip surface 52b of the base 5, the reset button 46 is operated, and the output of the detection sensor 48 at this time is stored in the volatile memory of the measurement control unit 49.

[0048] First, the contact surface 51a of the main body 51 of the base 5 of the leg length measurement device 1 is brought into surface contact with the main surface P21 of the second steel plate P2. The tip surface 52b of the protrusion 52 of the base 5 is brought into contact with the second toe TP2 of the weld bead B. More specifically, the tapered tip surface 52b of the protrusion 52 is aligned with the measurement position MP of the second toe TP2 extending in the left-right direction. This positions the tip surface 31c of the slide gauge 3, which is positioned at the same vertical position as the tip surface 52b of the protrusion 52, at the reference position. When the slide gauge 3 is positioned at the reference position, the tip surface 31c of the slide gauge 3 and the tip surface 52b of the base 5 overlap each other when viewed from the front.

[0049] Next, the operating knob 33 of the slide gauge 3 is operated to slide the slide gauge 3 downward. As described above, since the contact surface 51a of the base 5 is in contact with the main surface P21 of the second steel plate P2, the slide gauge 3 slides parallel to the main surface P21 of the second steel plate P2. In other words, the angle (angle A2 shown in FIG. 8) formed by the sliding direction of the slide gauge 3 and the main surface P11 of the first steel plate P1 in a side view is 90 degrees.

[0050] When the tip surface 31c of the slide gauge 3 abuts against the main surface P11 of the first steel plate P1, the numerical display 44 displays the amount of sliding of the slide gauge 3. Therefore, the worker can read the numerical value displayed on the numerical display 44 as the measurement result of the leg length S. The numeric display 44 has a display surface parallel to the contact surface 51a. Therefore, the operator can read the numerical value displayed on the numeric display 44 and at the same time adjust the posture of the leg length measurement device 1 so that the angle (angle A1 shown in FIG. 9) formed by the sliding direction of the slide gauge 3 with respect to the left-right direction in which the route R and the second end TP2 extend is 90 degrees. This makes it possible to prevent a decrease in the measurement accuracy of the leg length S.

[0051] After measuring the leg length S using the method described above, the worker then measures the plate thickness T of the first steel plate P1 or the second steel plate P2. 10 shows a state in which the plate thickness T of the second steel plate P2 is being measured using the leg length measurement device 1. The worker brings the contact surface 51a of the base 5 into contact with the end surface P22 of the second steel plate P2, and adjusts it so that the angle formed between the main surface P21 of the second steel plate P2 and the contact surface 51a (angle A3 shown in FIG. 10) is 90 degrees. Next, the worker measures the plate thickness T by reading the scale 53 displayed on the base 5. Finally, the worker can evaluate the quality of the fillet weld by comparing the measured leg length S and plate thickness T with predetermined reference values.

[0052] The leg length measurement device 1 according to one embodiment of the present invention has been described above. However, the above-described embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. In the above-described embodiment, the leg length S is measured by measuring the distance between the root R and the second toe TP2, but this is not limiting. The distance between the root R and the first toe TP1 may also be measured. This makes it possible to improve the reliability of the quality evaluation of the fillet weld.

[0053] In the above-described embodiment, the leg length S is measured at one measurement position MP, but this is not limiting. The leg length S may be measured at a plurality of measurement positions MP. This makes it possible to improve the reliability of the quality evaluation of the fillet weld. In the above-described embodiment, the plate thickness T of the second steel plate P2 is measured, but this is not limiting. The plate thicknesses T of both the first steel plate P1 and the second steel plate P2 may be measured, and the smaller plate thickness T may be compared with a reference value. This makes it possible to improve the reliability of the quality evaluation of the fillet weld.

[0054] Furthermore, in the above-described embodiment, a T-joint has been described as an example, but the type of joint is not limited to a T-joint. The leg length measurement device 1 of the present invention may be applied when measuring the leg length S of a lap joint or a back joint. This makes it possible to expand the scope of application of the present invention. [Explanation of symbols]

[0055] 1. Leg length measuring device 2. Measurement Unit 3 Slide gauge (sliding body) 31 Projection (first projection) 31a Tapered section 31b Extension 31c Tip surface (first tip surface) 32 Slide plate section 33 Control knob 4 Measurement main body 41 Housing 41a Gripping part 42 Tip 43 Sliding guide hole 44 Numerical Display 45 Power button 46 Reset Button 47 Auxiliary Button 48 Detection sensor 49 Measurement control section 5 Base 51 Main body 51a Contact surface 51b Side 52 Projection (second projection) 52a tapered section 52b tip surface (second tip surface, positioning portion) 53 scale B Weld bead MP measurement position P1 First Steel Plate P11 main surface P2 Second Steel Plate P21 main surface P22 end face RP ルート S foot length T plate thickness TP End Stop TP1 First end stop TP2 Second end stop

Claims

1. A leg length measuring device for measuring the leg length of a weld formed by fillet welding between one welding surface and another welding surface, a measurement unit including a sliding body that slides when operated by a sliding operation, and a measurement main body that slidably supports the sliding body and detects a sliding distance of the sliding body; a base having an abutment surface that comes into surface contact with the one welding surface, the base holding the measurement unit so that the sliding body can slide parallel to the one welding surface when the abutment surface comes into surface contact with the one welding surface, the base has a positioning portion that abuts against the toe of the weld and determines a reference position of the sliding body, a leg length measuring device characterized in that the measurement main body has a numerical display that displays the sliding distance of the sliding body between the reference position and the other welding surface on a display surface parallel to the abutment surface.

2. the sliding body has a first protruding portion that protrudes in a sliding direction, the positioning portion has a second protruding portion that protrudes in the sliding direction, 2. The leg length measurement device according to claim 1, wherein the first protrusion and the second protrusion overlap each other when viewed from a direction perpendicular to the contact surface when the sliding body is located at the reference position.

3. 3. The leg length measurement device according to claim 2, wherein the first protrusion and the second protrusion have tapered portions that become thinner toward their tips in the sliding direction.

4. the first protruding portion has a first tip surface formed with a flat surface perpendicular to the sliding direction, and an extension portion interposed between the tapered portion and the first tip surface and extending in the sliding direction, The leg length measurement device according to claim 3, wherein the second protrusion has a second tip surface on which a flat surface perpendicular to the sliding direction is formed.

5. 2. The leg length measurement device according to claim 1, wherein the slider has an operation knob extending in a direction perpendicular to the contact surface, and slides when the operation knob is slid.

6. 2. The leg length measuring device according to claim 1, wherein the base has a scale marking that allows dimensions to be measured visually.

Images