Irregular weld inspection ruler and measurement method thereof

Abstract

The application discloses an irregular welding seam testing ruler and a measuring method thereof, and relates to welding seam shape size measurement in the field of welding. The testing ruler comprises a long plate-shaped main ruler arranged in the transverse direction, and a ruler needle arranged on the main ruler and movable in the longitudinal direction. A first scale line is arranged on the upper edge of the front surface of the main ruler. Auxiliary bevels with a 45-degree angle with the longitudinal direction are arranged on both sides of the lower side of the main ruler. The ruler needle is arranged in the longitudinal direction and provided with sharp heads at both ends. A third scale line is arranged on the surface of the ruler needle. Multiple ruler needles are horizontally laid in rows for profile copying. Two rows of ruler needles are arranged at intervals in front and back. A locking mechanism is arranged on the main ruler. The irregular welding seam testing ruler is designed by using the principle of the collection and distribution type scale ruler needle. The front row of ruler needles is used for copying the welding seam, and the rear row of ruler needles is used for copying the corresponding non-welding seam area on the workpiece. The size of the irregular welding seam can be obtained by directly comparing or drawing the comparison of the two. The irregular welding seam measurement is accurately and quickly realized.

Description

Technical Field

[0001] This invention relates to the measurement of weld seam dimensions in the field of welding, specifically to an inspection ruler for irregular weld seams and its measurement method. Background Technology

[0002] Weld measurement plays an extremely important role in welding process and quality control. By accurately measuring the size, shape and position of the weld, it is possible to determine whether the welding process has met the expected standards and requirements. This helps to promptly identify and resolve potential problems in the welding process, such as welding defects and dimensional deviations, thereby ensuring the strength and stability of the welded joint.

[0003] A standard weld inspection gauge (such as the M306041 type) includes a height gauge and an undercut depth gauge on the front of the main gauge, as well as an angle gauge on the back. It can effectively measure dimensions such as butt welds, 90° fillet welds, weld bevels, undercut depth in butt welds, and gaps in butt welds. For example, when measuring the height of a flat weld, align the undercut depth gauge with the zero position and tighten the screw to prevent movement. Gently press the working surface of the weld inspection gauge (the surface in contact with the weld) against one side of the weld, slide the height gauge until it contacts the top of the weld (the weld point), and observe the reading on the height gauge; this is the weld height. However, the application range of a standard weld inspection gauge is limited. It cannot effectively measure irregular weld dimensions such as curved welds, obtuse angle welds, and lap welds.

[0004] Therefore, it is necessary to develop an inspection ruler for irregular welds and its measurement method to accurately, conveniently and quickly measure the dimensions of irregular welds such as arc welds, obtuse angle welds, and lap welds, thereby improving the inspection quality of welds in various welded structures. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide an irregular weld inspection ruler and its measurement method. This method enables accurate, convenient, and rapid measurement of the dimensions of irregular welds such as arc-shaped welds, obtuse-angle welds, and lap welds, thereby improving the weld inspection quality of various welded structures. Furthermore, it can also simultaneously measure conventional welds, significantly expanding its application range and improving measurement accuracy compared to conventional weld inspection rulers.

[0006] The technical solution of this invention is: an irregular weld inspection ruler, comprising a long plate-shaped main ruler arranged in the transverse direction and a ruler needle that passes through the main ruler and can move longitudinally.

[0007] The main ruler has a first scale line along the horizontal direction on the upper edge of the front side. The two upper corners of the main ruler are both 90 degrees, and the two lower corners are both provided with auxiliary bevels at an angle of 45 degrees to the longitudinal direction.

[0008] The ruler needles are arranged longitudinally and have pointed ends. The surface of the ruler needle has a third scale line in the longitudinal direction between the two pointed ends. Multiple ruler needles are laid out horizontally in rows for contouring. The two rows of ruler needles are arranged at intervals along the thickness direction of the main ruler. The main ruler is provided with a locking mechanism that can lock each row of ruler needles separately.

[0009] Preferably, the main ruler includes a front base plate, a middle base plate, and a rear base plate arranged sequentially from front to back. The first scale line is set on the front base plate, and two rows of ruler needles are respectively set between the front base plate and the middle base plate and between the middle base plate and the rear base plate.

[0010] Furthermore, the locking mechanism includes front locking bolts that pass through the front base plate and are threadedly connected to the middle base plate. The front locking bolts are arranged in pairs on both sides of the front base plate, and the front locking bolts are either a pair or multiple pairs arranged longitudinally at intervals.

[0011] Furthermore, the locking mechanism also includes rear locking bolts that are threaded through the rear bottom plate and connected to the middle bottom plate. The rear locking bolts are arranged in pairs on both sides of the rear bottom plate, and the rear locking bolts are either a pair or multiple pairs arranged longitudinally at intervals.

[0012] Furthermore, the bottom plate has threaded blind holes on the front and rear plates respectively for connection with the front and rear locking bolts.

[0013] Preferably, the front and rear surfaces of the bottom plate are provided with a limiting strip along the longitudinal direction. The limiting strip on each surface is attached to both sides of the corresponding row of needles. The limiting strip extends longitudinally to be flush with the upper and lower ends of the bottom plate. The thickness of the limiting strip is greater than the radius of the needle and does not exceed the diameter of the needle.

[0014] Furthermore, the front bottom plate and the rear bottom plate are respectively provided with front mating strips and rear mating strips along the longitudinal direction on the side adjacent to the middle bottom plate. The two front mating strips are respectively attached to and limited by the outer side of the two limiting strips on the front plate of the middle bottom plate, and the two rear mating strips are respectively attached to and limited by the outer side of the two limiting strips on the rear plate of the middle bottom plate.

[0015] The front mating strip, rear mating strip, and limiting strip have the same thickness.

[0016] Furthermore, both sides of the main scale are arranged longitudinally, and at least one side of the main scale front is provided with a second scale line along the longitudinal direction.

[0017] This invention also provides methods for using the irregular weld inspection ruler described above, including methods for measuring fillet welds, arc welds, and lap welds;

[0018] The method for measuring fillet welds includes: locking the front row of needles against the surface of the weld to be measured and the areas on both sides to simulate the contour of the weld and the areas on both sides; drawing the contour of the weld and the areas on both sides using the front row of needles; obtaining a weldless workpiece drawing based on the intersection of the extended lines of the areas on both sides on the contour drawing; using the rear row of needles to trace the shape of the weldless workpiece drawing and ensuring that the front and rear rows of needles match on both sides of the weld; obtaining the weld thickness based on the maximum value of the difference between the front and rear scales of the two rows of needles; and obtaining the weld width based on the difference between the scales of the two needles on the front row corresponding to the edge of the weld on the first scale line.

[0019] Furthermore, the arc surface weld measurement method includes: locking the front row of ruler needles against the surface of the weld to be measured and the areas on both sides to simulate the contour of the weld and the areas on both sides; moving the inspection ruler along the workpiece surface to a weld-free area, at which point the areas on both sides of the weld of the front row of ruler needles match the edge of the workpiece; filling the workpiece with the rear row of ruler needles; obtaining the weld thickness based on the maximum value of the difference between the front and rear scales of the two rows of ruler needles; and obtaining the weld width based on the difference between the scales of the two ruler needles on the front row of ruler needles corresponding to the edge of the weld on the first scale line.

[0020] Furthermore, the lap weld measurement method includes: pressing any row of ruler needles perpendicular to the surface of the base material onto the surface of the weld to be measured and the areas on both sides, and locking them to simulate the contour of the weld and the areas on both sides; obtaining the weld width based on the scale difference between the two ruler needles corresponding to the edge of the weld on the first scale line; and obtaining the weld height based on the scale difference between the highest and lowest ruler needles within the area of ​​the weld to be measured.

[0021] The beneficial effects of this invention are:

[0022] 1. An irregular weld inspection gauge is designed using the principle of distributed scale needles. Both rows of needles can move longitudinally through their ends to trace the surface contour. The front row of needles is used to trace the weld, and the rear row of needles is used to trace the corresponding non-weld area on the workpiece. The dimensions of the irregular weld can be obtained by direct comparison or graphical comparison, which can accurately, conveniently and quickly measure irregular welds.

[0023] 2. The irregular weld inspection gauge of this invention can also achieve various data of conventional welds using only a single row of needles. The weld reinforcement height can be measured by the difference in scale between the needle at the edge of the weld and the needle at the highest point of the weld center; the weld width can be measured by the difference in scale between the needles on both sides of the weld corresponding to the first scale line on the base plate; the undercut depth can be measured by the difference in scale between the needle at the edge of a normal weld and the needle at the deepest point of the undercut; if there are defects such as weld beads, incomplete welds, or depressions, the size of the defects can also be measured by the difference in scale between the needles.

[0024] 3. The main ruler of this invention has two 90-degree angles on the upper side and two 45-degree angles on the lower side, which are auxiliary bevels. These auxiliary bevels facilitate close contact with the weld area on both sides when measuring conventional right-angle welds. The needle has pointed ends, which facilitates precise measurement of small parts such as undercuts and pits. A third graduation line is set in the middle part, which facilitates direct acquisition of longitudinal dimension data during single-row measurement or comparison of the front and rear graduations during double-row measurement.

[0025] 4. The main scale includes a front base plate, a middle base plate, and a rear base plate arranged sequentially. The front row of scale needles is located between the front and middle base plates and is locked or released by the front row of locking bolts. The rear row of scale needles is located between the middle and rear base plates and is locked or released by the rear row of locking bolts. The two rows of scale needles are controlled separately by the front and rear locking bolts to quickly achieve their respective contour contouring.

[0026] 5. The main scale's base plate has threaded blind holes on both the front and rear plates. This ensures that adjusting the spacing of the front row of locking bolts does not affect the rear base plate, and vice versa. Both the front and rear plates of the base plate have longitudinally positioned limiting strips that fit snugly against both sides of each row of needles. This restricts the needles to move only longitudinally, achieving contour following. The thickness of the limiting strips does not exceed the needle diameter, ensuring that the front base plate can press and lock the front row of needles, and the rear base plate can press and lock the rear row of needles.

[0027] 6. When measuring obtuse angle welds using an irregular weld inspection ruler, the front row of ruler needles simulates the weld and the outline of the areas on both sides and draws a diagram. By intersecting the extended lines of the two outlines, a weldless workpiece diagram is obtained. The rear row of ruler needles is used to trace the shape of the weldless workpiece diagram. The maximum value of the difference between the front and rear scales of the two rows of ruler needles can be used to obtain the thickness of the fillet weld, thus quickly achieving accurate measurement of various irregular fillet welds such as obtuse angle welds and acute angle welds.

[0028] 7. When measuring arc-shaped welds using an irregular weld inspection ruler, the front row of ruler needles simulates the weld and the contour of the areas on both sides, while the rear row of ruler needles is used to trace the corresponding non-weld areas on the workpiece. The weld thickness is obtained based on the maximum difference between the front and rear scales of the two rows of ruler needles, and the weld width is obtained based on the difference between the scales on the first scale line corresponding to the two weld toes on the front row of ruler needles. This allows for the rapid and accurate measurement of various irregular arc-shaped welds, such as inner arc-shaped welds and outer arc-shaped welds.

[0029] 8. When measuring lap welds using an irregular weld inspection ruler, any row of dimensions can be used to simulate the weld and the outline of the areas on both sides. The weld width can be obtained by the difference in the scale of the two rulers corresponding to the edge of the weld on the first scale line. The weld height can be obtained by the difference in the scale of the highest and lowest rulers, thus quickly achieving accurate measurement of lap welds. Attached Figure Description

[0030] Figure 1This is the main view of the irregular weld inspection ruler of the present invention.

[0031] Figure 2 This is a top view of the irregular weld inspection ruler of the present invention.

[0032] Figure 3 This is a side view of the irregular weld inspection ruler of the present invention.

[0033] Figure 4 This is a schematic diagram of the measurement of the butt weld in Example 1.

[0034] Figure 5 This is a diagram showing the height measurement of a regular fillet weld (right angle) in Example 2.

[0035] Figure 6 This is a schematic diagram of the front row of ruler needles for a regular corner weld (right angle) in Example 2.

[0036] Figure 7 This is a schematic diagram of the front and rear rows of ruler needles for a regular corner weld (right angle) in Example 2.

[0037] Figure 8 This is a schematic diagram of weld undercut measurement in Example 3.

[0038] Figure 9 This is a schematic diagram of weld misalignment measurement in Example 4.

[0039] Figure 10 This is a schematic diagram of workpiece size measurement in Example 4.

[0040] Figure 11 This is a schematic diagram of the front row of ruler needles for the arc-shaped weld in Example 5.

[0041] Figure 12 This is a schematic diagram of the back row of ruler needles for the arc-shaped weld in Example 5.

[0042] Figure 13 This is a diagram showing the height measurement of an irregular fillet weld (obtuse angle) in Example 6.

[0043] Figure 14 This is a schematic diagram of the front row of ruler needles for an irregular fillet weld (obtuse angle) in Example 6.

[0044] Figure 15 This is a schematic diagram of the front and rear rows of ruler needles for the irregular corner weld (obtuse angle) in Example 6.

[0045] Figure 16 This is a schematic diagram of the measurement of the lap weld in Example 7.

[0046] Wherein: 1-Main scale 2-Scale needle 3-Third scale line 4-Pointed tip 5-Front base plate 6-Middle base plate (61-Threaded blind hole) 10-7-Rear base plate 8-Front row locking bolts 9-Rear row locking bolts 10-Limiting strip 11-First scale line 12-Second scale line 13-Auxiliary bevel 14-Front mating strip 15-Rear mating strip. Detailed Implementation

[0047] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] The following specific embodiments will provide a more detailed description of the present invention.

[0050] Example 1

[0051] like Figures 1-3 As shown, the present invention provides an inspection ruler for irregular welds, including a long plate-shaped main ruler 1 arranged laterally and a ruler needle 2 that passes through the main ruler 1 and is movable longitudinally. In this embodiment, Figure 1 The left and right directions are horizontal, the top and bottom directions are vertical, and the thickness of the main scale 1 is perpendicular to the axis. Figure 1 Image orientation.

[0052] The main scale 1 has a first scale line 11 on the upper edge of the front side along the horizontal direction, and both sides of the main scale are set along the vertical direction. The two upper corners of the main scale 1 are 90 degrees, and the two lower corners are provided with auxiliary bevels 13 at an angle of 45 degrees to the vertical direction. The main scale 1 includes a front base plate 5, a middle base plate 6, and a rear base plate 7 arranged in sequence. The three base plates have the same shape, and the first scale line 11 is set on the front surface of the front base plate 5.

[0053] The measuring needles 2 are arranged longitudinally and have pointed tips 4 at both ends. A third scale line 3 is provided longitudinally between the two pointed tips 4 on the surface of the measuring needles 2. Multiple measuring needles 2 are densely arranged horizontally in rows for contouring. Two rows of measuring needles 2 are spaced apart along the thickness direction of the main scale 1. The two rows of measuring needles 2 are respectively located between the front base plate 5 and the middle base plate 6, and between the middle base plate 6 and the rear base plate 7. That is, the front row of measuring needles is located between the front base plate 5 and the middle base plate 6, and the rear row of measuring needles is located between the middle base plate 6 and the rear base plate 7. The main scale 1 is equipped with a locking mechanism that can lock each row of measuring needles 2 separately.

[0054] The locking mechanism includes front locking bolts 8 that pass through the front base plate 5 and are threaded to the middle base plate 6. The front locking bolts 8 are arranged in pairs on both sides of the front base plate 5, and there may be one pair or multiple pairs arranged longitudinally at intervals. The locking mechanism also includes rear locking bolts 9 that pass through the rear base plate 7 and are threaded to the middle base plate 6. The rear locking bolts 9 are arranged in pairs on both sides of the rear base plate 7, and there may be one pair or multiple pairs arranged longitudinally at intervals.

[0055] In this embodiment, there are two pairs of front locking bolts 8 and two pairs of rear locking bolts 9. The lower pair of front locking bolts 8 and rear locking bolts 9 are both located near the auxiliary inclined side 13. The middle base plate 6 has threaded blind holes 61 on the front and rear plates, which are respectively connected to the front locking bolts 8 and rear locking bolts 9.

[0056] Both the front and rear surfaces of the middle base plate 6 are provided with longitudinal limiting strips 10, and the upper limiting strips 10 on each surface are fitted to both sides of the corresponding row of needles 2. That is, the two limiting strips 10 on the front surface of the middle base plate 6 are set on both sides of the front row of needles 2 to restrict the front row of needles 2 to move only longitudinally; the two limiting strips 10 on the rear surface of the middle base plate 6 are set on both sides of the rear row of needles 2 to restrict the rear row of needles 2 to move only longitudinally.

[0057] The limiting strip 10 extends longitudinally to be flush with the upper and lower ends of the middle base plate 6. The thickness of the limiting strip 10 is greater than the radius of the needle 2 but does not exceed the diameter of the needle 2. In some preferred embodiments, the front base plate 5 and the rear base plate 7 are respectively provided with front mating strips 14 and rear mating strips 15 along the longitudinal direction on the side adjacent to the middle base plate 6. There are two front mating strips 14 and two rear mating strips 15. The two front mating strips 14 are respectively fitted and limited to the outer side of the two limiting strips 10 on the front plate surface of the middle base plate 6, and the two rear mating strips 15 are respectively fitted and limited to the outer side of the two limiting strips 10 on the rear plate surface of the middle base plate 6. Therefore, the front mating strips 14 and the two limiting strips 10 on the front plate surface can be connected front to back to form an internal space that is only longitudinally connected, further limiting the front row of needles 2 inside, and preventing leakage from the side of the front base plate 5 when the front row locking bolts 8 are too loose. Similarly, the two rear mating strips 15 can also be connected front to back to the two limiting strips 10 on the rear plate surface to form an internal space that is only longitudinally connected, further limiting the rear row of needles 2 inside. The front mating strip 14, the rear mating strip 15 and the limiting strip 10 have the same thickness. As a preferred range, the thickness of the three is 0.8d to 0.95d (d = diameter of the ruler needle 2).

[0058] In a preferred embodiment, a second scale line 12 is provided longitudinally along one or both sides of the front base plate 5. The second scale line 12 can cooperate with the first scale line 11 to form a right-angle ruler for measuring the size of the workpiece.

[0059] The above irregular weld inspection gauge can be used to measure conventional butt welds, thereby improving measurement accuracy.

[0060] Butt weld measurement, such as Figure 4 As shown, any row of closely spaced needles (preferably the front row) is placed against the surface of the weld being measured along a direction perpendicular to the base material. The line connecting the tips of each needle can simulate the weld contour. Various weld data can be read by combining the needle scale and the base plate scale: the weld reinforcement height can be measured by the difference in scale between the needles at the weld edge and the needle at the highest point of the weld center (i.e., the difference in scale between the third scale line 3 of the two needles). Figure 4 The weld reinforcement height is vertical, meaning the longitudinal distance between the third graduation line 3 on the edge ruler and the third graduation line 3 on the highest point of the weld center ruler is used to determine the weld reinforcement height. The weld width can be measured by the difference in graduations between the edge rulers on both sides of the weld and the first graduation line 11 on the base plate. Figure 4 The width of the middle weld is in the left-right direction.

[0061] Example 2

[0062] The irregular weld inspection gauge described above can be used to measure conventional fillet welds (right angles), thereby improving measurement accuracy.

[0063] Depend on Figure 5As shown, the right-angled side of the main ruler 1 moves downwards close to the vertical edge of the base material until it contacts the weld. The ruler needle points downwards and contacts the horizontal surface of the workpiece. The distance between the highest point of the weld and the horizontal surface of the workpiece, i.e., the weld height, can be obtained from the third scale line 3 of the ruler needle.

[0064] Depend on Figure 6 As shown, the weld gauge main plate has a 45° bevel (auxiliary bevel 13) flush with the base material on both sides of the fillet weld. The front row of gauge needles is placed on the weld surface to simulate the weld contour, drawing the weld and the contour diagram of the two sides. On the contour diagram, the weldless workpiece diagram is obtained by intersecting the extended lines of the two workpiece areas. The rear row of gauge needles then traces the shape according to the weldless workpiece diagram, ensuring that the front and rear rows of gauge needles match on both sides of the weld area. Figure 7 As shown (black front row needles, red back row needles), the fillet weld thickness is obtained based on the maximum difference between the front and rear scale markings of the two rows of needles. That is, the front and rear needles are considered as a pair, and the difference in scale markings on the third scale line 3 of each pair of needles is calculated to obtain the spacing between each pair of needles along the longitudinal direction of the main ruler. The maximum difference in scale markings between each pair of needles in the weld area is the fillet weld thickness. The weld width is obtained by calculating the difference in scale markings on the first scale line 11 between the two needles on the front row corresponding to the weld edge.

[0065] Example 3

[0066] Measurement of weld defects such as undercut Figure 8 As shown, by using any row of rulers for contouring, the depth of the undercut can be measured by the difference in scale between the ruler at the workpiece base material and the ruler at the deepest point of the weld undercut (i.e., the difference in scale between the third scale line 3 of the two rulers); the width of the defect can be measured by the difference in scale between the two rulers at the edge of the defect corresponding to the first scale line 11; the measurement of defects such as weld beads, incomplete welds, and depressions is the same, and will not be elaborated here.

[0067] Example 4

[0068] Weld misalignment measurement as follows Figure 9 As shown, after any row of densely packed ruler needles is placed on the surface of the weld to be measured and the areas on both sides, the weld and the contour of the areas on both sides are simulated. The misalignment of the weld can be measured by the difference in the ruler needle scale at the base material on both sides of the weld edge (i.e., the difference in the third scale line 3 between the two ruler needles).

[0069] Workpiece dimension measurement, such as Figure 10 As shown, with the two measuring needles pressed against the radial outer end of the annular workpiece, the difference in scale readings on the first scale line 11 represents the outer diameter of the workpiece; with the two measuring needles pressed against the radial inner end of the annular workpiece, the difference in scale readings on the first scale line 11 represents the inner diameter of the workpiece. By inserting the measuring needles into the interior of the part, the depth of the part can be obtained through the third scale line 3 on the measuring needles. By pulling the measuring needles out of the main scale, the length and width of the part can also be directly measured through the third scale line 3 on the measuring needles, or the length and width of the part can be directly measured through the first scale line 11 and the second scale line 12.

[0070] Example 5

[0071] The above-mentioned irregular weld inspection gauge can be used to measure arc-shaped welds, thereby achieving accurate measurement of irregular welds:

[0072] After the front row of ruler needles is pressed against the surface of the weld being measured and the areas on both sides, it is locked in place. Figure 11 As shown, the weld seam and the contours of both sides are simulated; the inspection gauge is moved along the workpiece surface to a weld-free area, at which point the weld seam areas of the front row of gauge needles align with the workpiece edge, and the rear row of gauge needles is then fully positioned on the workpiece, as shown. Figure 12 As shown, the weld thickness is obtained based on the maximum difference between the front and rear scales of the two rows of rulers, and the weld width is obtained based on the difference between the scales of the two rulers on the front row of rulers corresponding to the edge of the weld on the first scale line 11. Figure 11 , 12 The measurement of welds on the outer arc surface is the same as that on the inner arc surface, and will not be repeated here.

[0073] Example 6

[0074] The above irregular weld inspection ruler can be used to measure corner welds (obtuse angles), thus realizing the measurement of irregular welds:

[0075] like Figure 13 As shown, the base material is placed horizontally, and the weldment is welded at an obtuse angle on the upper surface of the base material. A row of densely packed needles is placed against the surface of the weld to be measured along a direction perpendicular to the base material. The line connecting the tips of each needle can simulate the weld contour. The height of the corner joint weld can be measured by the difference in scale between the edge needle at the weld joint and the base material and the needle at the highest point of the weld center.

[0076] like Figure 14 As shown, after the front row of ruler needles is placed on the surface of the weld being measured and the areas on both sides, it is locked in place. A contour diagram of the fillet weld and the areas on both sides is then drawn, as shown. Figure 15 As shown (black front row needles, red back row needles), the seamless workpiece drawing is obtained by intersecting the extended lines of the two sides on the outline drawing. The back row needles are used to trace the seamless workpiece drawing and make the front and back rows of needles match on both sides of the weld area. The thickness of the fillet weld is obtained by the maximum value of the difference between the front and back scales of the two rows of needles. That is, the front and back needles are considered as a pair, and the difference between the third scale line 3 of each pair of needles is calculated to obtain the spacing of each pair of needles along the longitudinal direction of the main ruler. The maximum value of the difference between the scales of each pair of needles in the weld area is the thickness of the fillet weld. The weld width is obtained by the difference between the scales of the two needles on the front row corresponding to the edge of the weld on the first scale line 11.

[0077] Example 7

[0078] The above irregular weld inspection gauge can be used to measure lap welds, thus enabling the measurement of irregular welds:

[0079] like Figure 16As shown, any row of ruler needles is pressed against the surface of the weld to be measured and the areas on both sides in a direction perpendicular to the surface of the base material, and then locked to simulate the contour of the weld and the areas on both sides. The weld width is obtained according to the scale difference between the two ruler needles corresponding to the edge of the weld on the first scale line 11. The weld height is obtained according to the scale difference between the highest and lowest ruler needles in the area of ​​the weld to be measured.

Claims

1. An inspection ruler for irregular welds, characterized in that, It includes a long plate-shaped main ruler (1) arranged in the horizontal direction and a ruler needle (2) that is inserted on the main ruler (1) and can move longitudinally. The main ruler (1) has a first scale line (11) on the upper edge of the front side along the horizontal direction. The two upper corners of the main ruler (1) are both 90 degrees and the two lower corners are both provided with auxiliary hypotenuses (13) with an angle of 45 degrees to the longitudinal direction. Both ends of the ruler needle (2) are provided with pointed tips (4). The surface of the ruler needle (2) has a third scale line (3) in the longitudinal direction between the two pointed tips (4). Multiple ruler needles (2) are laid out horizontally in rows for contour shaping. The two rows of ruler needles (2) are arranged at intervals along the thickness direction of the main ruler (1). The main ruler (1) is provided with a locking mechanism that can lock each row of ruler needles (2) separately. The main ruler (1) includes a front base plate (5), a middle base plate (6), and a rear base plate (7) arranged in sequence. The first scale line (11) is set on the front base plate (5), and two rows of ruler needles (2) are respectively set between the front base plate (5), the middle base plate (6), and the middle base plate (6) and the rear base plate (7). The locking mechanism includes front locking bolts (8) that pass through the front base plate (5) and are threaded to the middle base plate (6). The front locking bolts (8) are arranged in pairs on both sides of the front base plate (5). The front locking bolts (8) are either a pair or multiple pairs arranged longitudinally at intervals. The locking mechanism also includes a rear row of locking bolts (9) that are threaded through the rear bottom plate (7) and the middle bottom plate (6). The rear row of locking bolts (9) are arranged in pairs on both sides of the rear bottom plate (7). The rear row of locking bolts (9) can be a pair or multiple pairs arranged longitudinally at intervals. The front and rear surfaces of the bottom plate (6) are provided with limiting strips (10) along the longitudinal direction. The limiting strips (10) on each surface are attached to the sides of the corresponding rows of needles (2). The limiting strips (10) extend longitudinally to be flush with the upper and lower ends of the bottom plate (6). The thickness of the limiting strips (10) is greater than the radius of the needles (2) and does not exceed the diameter of the needles (2).

2. The irregular weld inspection gauge as described in claim 1, characterized in that, The bottom plate (6) has threaded blind holes (61) on the front and rear plates respectively connected to the front row locking bolts (8) and the rear row locking bolts (9).

3. The irregular weld inspection gauge as described in claim 1, characterized in that, The front bottom plate (5) and the rear bottom plate (7) are respectively provided with front mating strips (14) and rear mating strips (15) along the longitudinal direction on the side adjacent to the middle bottom plate (6). The two front mating strips (14) are respectively attached to the outer side of the two limiting strips (10) on the front plate surface of the middle bottom plate (6) for limiting, and the two rear mating strips (15) are respectively attached to the outer side of the two limiting strips (10) on the rear plate surface of the middle bottom plate (6) for limiting. The front mating strip (14), the rear mating strip (15), and the limiting strip (10) have the same thickness.

4. A method of using the irregular weld inspection ruler as described in claim 1, characterized in that, This includes measurement methods for fillet welds, arc welds, and lap welds; The method for measuring fillet welds includes: locking the front row of rulers against the surface of the weld to be measured and the areas on both sides to simulate the contour of the weld and the areas on both sides; drawing the contour of the weld and the areas on both sides using the front row of rulers; obtaining a weldless workpiece drawing based on the intersection of the extended lines of the areas on both sides on the contour drawing; using the rear row of rulers to perform contouring based on the weldless workpiece drawing and making the front and rear rows of rulers match on both sides of the weld; obtaining the weld thickness based on the maximum value of the difference between the front and rear scales of the two rows of rulers; and obtaining the weld width based on the difference between the scales of the two rulers on the front row of rulers corresponding to the edge of the weld on the first scale line (11).

5. The method of using the irregular weld inspection gauge as described in claim 4, characterized in that, The arc surface weld measurement method includes: locking the front row of rulers against the surface of the weld to be measured and the areas on both sides to simulate the outline of the weld and the areas on both sides; moving the inspection ruler along the surface of the workpiece to the area without welds, at which time the areas on both sides of the weld of the front row of rulers match the edge of the workpiece; filling the workpiece with the rear row of rulers; obtaining the weld thickness based on the maximum value of the difference between the front and rear scales of the two rows of rulers; and obtaining the weld width based on the difference between the scales of the two rulers on the front row of rulers corresponding to the edge of the weld on the first scale line (11).

6. The method of using the irregular weld inspection gauge as described in claim 4, characterized in that, The method for measuring lap welds includes: placing any row of rulers perpendicular to the surface of the base material onto the surface of the weld to be measured and the areas on both sides, and locking them to simulate the contour of the weld and the areas on both sides; obtaining the weld width based on the scale difference between the two rulers corresponding to the edge of the weld on the first scale line (11); and obtaining the weld height based on the scale difference between the highest and lowest rulers in the area of ​​the weld to be measured.

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