Device and method for positioning the length and notch center of an impact specimen for a welded joint

Abstract

The present invention discloses a device and method for positioning the length and notch center of a welded joint impact specimen. The device includes a base and a transparent positioning scale. The positioning scale is arranged at the edge position of the upper end face of the base. A notch is provided on the positioning scale, and scale lines and scale numbers for notch center positioning are marked on the positioning scale. The method includes five major steps: preprocessing the impact specimen blank, placing the specimen with the notch face, moving and determining the notch center position on the impact specimen blank, drawing positioning lines and fixed-length lines, and machining the notch. By presetting common scale lines, the present invention can quickly position the notch center, improve the positioning efficiency, ensure that the specimen length and notch center position meet the process requirements, can greatly improve the processing efficiency while improving the processing accuracy of the specimen, is not only applicable to the positioning at different positions on the impact specimen blank, but also applicable to the positioning of the raw material impact specimen blank, and can also be used for rapid inspection, ensuring the processing quality.

Description

Technical Field

[0001] The present invention belongs to the construction technical field of ships, bridges, offshore engineering products, large pressure vessels, etc., and relates to the sample length determination and notch positioning in the preparation process of welding joint impact specimens in welding procedure qualification, and particularly relates to a device and method for positioning the length and notch center of welding joint impact specimens. Background Art

[0002] A large number of welded structures are used in the construction processes of offshore engineering, bridges, large pressure vessels, and various large ships. At present, the most widely used method for evaluating the toughness of welded joints is the Charpy pendulum impact test.

[0003] The impact test principle is to use a pendulum to strike an impact specimen processed into a specified size and notch once to obtain the corresponding absorbed energy value, so as to evaluate its impact performance indexes, such as impact toughness, impact absorbed energy, etc. Since the impact test is simple and convenient and is extremely sensitive to the brittle tendency of materials, metallurgical quality, and internal defect conditions, it is a simple method for checking the brittle tendency of materials and metallurgical quality. Since the toughness of welded joints is an important index of the quality of welded joints, the impact test is still widely used in this field.

[0004] The impact test specimens of welded joints are intercepted from the welded test plates, and then after being processed through multiple processes such as a sawing machine, a planing machine, a grinding machine, etc., they are eroded by a chemically erosive solution with a special ratio, such as Figures 4 - 6 shown, the impact test specimens include the base metals at both ends, the heat affected zones, the first fusion line, the second fusion line, and the weld metal in the middle, and Figure 5 is the notch opening surface of the specimen. The width of the specimen is generally 10 mm, and the thickness is generally 10 mm, 7.5 mm, 5.0 mm, and 2.5 mm. During the preparation process, it is necessary to note that the specimen length should meet the standard requirements. The impact test standard requires that the impact specimen length is 55 mm, with a tolerance of ±0.60 mm; the notch center is 27.5 mm from both ends of the specimen, with a tolerance of ±0.42 mm.

[0005] The most critical thing in the processing process of welding joint impact specimens is the control of the specimen length dimension and the notch center position. Especially if the notch center position of the specimen located at the center of the fusion line and 1 mm, 2 mm, 5 mm outside the fusion line deviates from the actual position, it will cause the test results to deviate seriously and affect the data accuracy.

[0006] At present, the processing method steps of the impact specimen of the welded joint include: First, after receiving the impact sample blank, the marking personnel use a graduated straight ruler to determine the position of the center of the notch according to the requirements of the client, draw a line at this position with a right-angled ruler, and after making a mark, hand it over to the machining personnel; Then, the machining personnel align the line on the specimen on the sawing machine, use a tape measure to locate the 27.5 mm position, and then saw off both ends; Finally, the notches of the sawn specimens are broached on a broaching machine.

[0007] This method mainly relies on manual labor, with low machining accuracy. The lengths of the processed impact specimens are likely to be uneven, and the proportion of those not meeting the standard requirements is large, thus resulting in low processing efficiency.

[0008] The Chinese invention application document with the publication number CN108918229A discloses a device and method for the fixed-length and notch positioning of the impact specimen of the welded joint. "It includes a fixed-length fixture, a cutting fixture, and a straight ruler. The cutting fixture is placed inside the fixed-length fixture. The fixed-length fixture includes fixed-length clamping plates at both ends. The cutting fixture includes cutting clamping plates at both ends. The fixed-length clamping plates and the cutting clamping plates are both axisymmetric structures and their axes of symmetry coincide. The intersection point of the axis of symmetry and the inner side of the fixed-length clamping plate is the fixed-length midpoint, and the intersection point of the axis of symmetry and the inner side of the cutting clamping plate is the cutting midpoint. The width of the cutting fixture is less than the width of the fixed-length fixture. A fixed-length clamping knob is provided at one end of the fixed-length fixture, and a cutting clamping knob is provided at one end of the cutting fixture.", However, this invention patent has the following two disadvantages:

[0009] 1. Complex installation process: This invention patent involves the combined use of multiple components such as fixtures, knobs, and straight rulers. It requires multiple installation and tightening steps to complete the fixed-length and notch positioning, increasing the operation difficulty and likely affecting the production efficiency.

[0010] 2. High requirement for operation accuracy: This invention patent requires precise positioning and measurement of positions, lengths, etc. in multiple steps, with high requirements for the technical ability and experience of the operator. Improper operation is likely to lead to product quality problems. Summary of the Invention

[0011] To solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a device for positioning the length and notch center of a welded joint impact specimen. With the device of the present invention, three positioning lines can be drawn, and the machining personnel can directly adjust the position of the saw blade according to the positioning lines to ensure that the specimen length meets the requirements and the notch center position also meets the requirements. Using this device can not only make the length of the impact specimen meet the standard requirements, but more importantly, ensure the accurate position of the notch center of the fusion line, 1 mm, 2 mm, and 5 mm outside the fusion line of the welded joint through the combination of the 5 mm marking line and different scales on the device. In addition, the present invention also provides a method for positioning the length and notch center of a welded joint impact specimen.

[0012] To achieve the above object and other related objects, the present invention adopts the following technical solutions:

[0013] In the first aspect of the present invention, there is provided a device for positioning the length and notch center of a welded joint impact specimen. The device includes a base and a transparent positioning scale. A positioning scale is provided at the edge position of the upper end surface of the base. The positioning scale includes a first positioning scale, and the first positioning scale is located at any one side edge position of the upper end surface of the base. The positioning scale is rectangular, and the long side of the positioning scale is closely fixed to the edge of the upper end surface of the base. The length of the positioning scale is the process requirement length of the welded joint impact specimen. The positioning scale is marked with scale lines and scale numbers. The distance from the scale line to the edge of the base is half of the thickness of the impact sample blank. The scale line takes the center position of the positioning scale as the reference line and is marked as 0. A notch is provided on the positioning scale from the reference line towards one end of the positioning scale. The notch is a rectangular opening facing outwards, and the notch edge coinciding with the reference line is the positioning notch edge.

[0014] As a preferred technical solution, the positioning scale further includes a second positioning scale, a third positioning scale, and a fourth positioning scale, which are respectively located at the other three side edge positions of the upper end surface of the base.

[0015] As a further preferred technical solution, the first positioning scale is marked with scale values of 0 - 27.5 mm from the reference line towards one end of the first positioning scale, the second positioning scale is marked with scale values of 0 - 1 mm from the reference line towards one end of the second positioning scale, the third positioning scale is marked with scale values of 0 - 2 mm from the reference line towards one end of the third positioning scale, the fourth positioning scale is marked with scale values of 0 - 5 mm from the reference line towards one end of the fourth positioning scale, and the first positioning scale is marked with scale values of x - 27.5 mm from the reference line towards the other end of the first positioning scale, where x is the width of the notch and the minimum scale is 1 mm.

[0016] As a further preferred technical solution, the base is a cuboid, the upper end face of the base is square, and the thickness of the base is the same as the width of the impact test blank.

[0017] As a further preferred technical solution, the positioning scale is 55 mm in length, and the midpoint of the long side of the positioning scale is located at the center of the side of the base.

[0018] As a further preferred technical solution, the edge of the notch away from the reference line is machined into a beveled edge, and the beveled edge of the notch is triangular.

[0019] As a further preferred technical solution, there are text markings on the upper end face of the base near the positioning scale. On the upper end face of the panel near the first positioning scale, it is marked with "Weld Center"; on the upper end face of the panel near the second positioning scale, it is marked with "1 mm outside the fusion line"; on the upper end face of the panel near the third positioning scale, it is marked with "2 mm outside the fusion line"; on the upper end face of the panel near the fourth positioning scale, it is marked with "5 mm outside the fusion line".

[0020] In the second aspect of the present invention, there is provided a method for positioning the length and notch center of an impact specimen for a welded joint. The impact specimen is obtained by processing an impact test blank. The impact test blank includes a welded joint, and the welded joint includes a weld, a first fusion line, and a second fusion line. The positions of the notch center include the weld center, the fusion line center, 1 mm outside the fusion line, 2 mm outside the fusion line, and 5 mm outside the fusion line. The length and notch center of the impact test blank are positioned by means of the device described in the first aspect of the present invention.

[0021] The device includes a base and a transparent positioning scale. There is a positioning scale at the edge position of the upper end face of the base. The positioning scale includes a first positioning scale, and the first positioning scale is located at any edge position of the upper end face of the base. The positioning scale is rectangular, and the long side of the positioning scale is closely fixed to the edge of the upper end face of the base. The length of the positioning scale is the process requirement length of the impact specimen of the welded joint. There are scale lines and scale numbers marked on the positioning scale. The distance between the scale line and the edge of the base is half of the thickness of the impact test blank. The scale line takes the center position of the positioning scale as the reference line and is marked as 0. There is a notch opened from the reference line towards one end of the positioning scale on the positioning scale. The notch is a rectangle with an opening facing outwards, and the notch edge coinciding with the reference line is the positioning notch edge.

[0022] The method includes the following steps:

[0023] Step 1: Pretreat the impact test blank, and use chemical reagents to erode the impact test blank so that the fusion lines of the welded joint of the impact test blank are clearly shown;

[0024] Step 2: Place the notched surface of the impact test blank specimen under the transparent positioning scale, and move the impact test blank towards the device until the impact test blank abuts against the base;

[0025] Step 3: Move the device along the length direction of the impact test blank. The intersection point of the first fusion line and the scale line on the positioning scale is the first intersection point, and the intersection point of the second fusion line and the scale line on the positioning scale is the second intersection point. Determine the notch center position on the impact test blank according to the scale value of the first intersection point on the scale line and / or the scale value of the second intersection point on the scale line;

[0026] Step 4: Use a marking tool to draw slender notch center positioning lines, a first fixed-length line, and a second fixed-length line on the impact test blank respectively;

[0027] Step 5: Use a machining device to process the length of the impact test blank according to the first fixed-length line and the second fixed-length line, and process the notch of the impact test blank according to the notch center positioning line.

[0028] As a preferred technical solution, in the said Step 3, the specific operation steps for determining the notch center position on the impact test blank according to the scale value of the first intersection point and / or the scale value of the second intersection point on the scale line include:

[0029] When the scale value of the first intersection point on the scale line is equal to the scale value of the second intersection point on the scale line, the weld center position at the edge of the positioning groove on the impact test blank is the notch center position;

[0030] When the scale value of the first intersection point or the second intersection point on the scale line is 0, the fusion line center position at the edge of the positioning groove on the impact test blank is the notch center position;

[0031] When the scale value of the first intersection point close to the edge of the positioning groove or the second intersection point close to the edge of the positioning groove on the scale line is 1, the position 1 mm outside the fusion line at the edge of the positioning groove on the impact test blank is the notch center position;

[0032] When the scale value of the first intersection point close to the edge of the positioning groove or the second intersection point close to the edge of the positioning groove on the scale line is 2, the position 2 mm outside the fusion line at the edge of the positioning groove on the impact test blank is the notch center position;

[0033] When the scale value of the first intersection point close to the edge of the positioning groove or the second intersection point close to the edge of the positioning groove on the scale line is 5, the position 5 mm outside the fusion line at the edge of the positioning groove on the impact test blank is the notch center position.

[0034] As a preferred technical solution, in the fourth step, the specific steps of using a marking tool to respectively draw a slender notch center positioning line, a first fixed-length line, and a second fixed-length line on the impact test blank include: on the impact test blank, using the marking tool to draw a slender notch center positioning line along the edge of the positioning groove at the notch center position, and at the same time, using the marking tool to draw the first fixed-length line and the second fixed-length line along the two ends' edges of the positioning scale on the impact test blank.

[0035] As a preferred technical solution, in the fifth step, the specific steps of using a machining device for processing include:

[0036] When the machining device used is a broaching machine, it is necessary to first perform end cutting on the impact test blank according to the first fixed-length line and the second fixed-length line, and then place one end of the sawed impact test blank close to the end positioning device of the broaching machine. The broaching machine can automatically use a broach to broach a notch with the dimensions and shape of the impact test specimen specified by the process requirements at a distance of 27.5 mm from the end of the impact test blank;

[0037] When the machining devices used are machine tools such as a milling machine, a grinding machine, or an electro-discharge machining machine, based on the notch center positioning line, a notch with the dimensions and shape of the impact test specimen specified by the process requirements can be directly broached.

[0038] As described above, the present invention has the following beneficial effects:

[0039] (1) For the device and method for positioning the length and notch center of a welding joint impact specimen of the present invention, through the preset common scale lines on the transparent positioning scale of the device of the present invention, the accurate positions of the notch centers of the impact specimens at the positions of the weld center, the fusion line center, 1 mm outside the fusion line, 2 mm outside the fusion line, and 5 mm outside the fusion line are ensured. The notch center positioning line, the first fixed-length line, and the second fixed-length line can be quickly positioned and drawn, improving the positioning efficiency of the impact specimen. While ensuring that the specimen length meets the process requirements, it also ensures that the notch center position meets the process requirements.

[0040] (2) For the device and method for positioning the length and notch center of a welding joint impact specimen of the present invention, this device is not only applicable to positioning the specimen length and notch center position at different positions on the welding joint impact test blank, but also applicable to positioning the specimen length and notch center position of the raw material impact test blank.

[0041] (3) For the device and method for positioning the length and notch center of a welding joint impact specimen of the present invention, the machining personnel can directly adjust the position of the saw blade according to the positioning markings of the device of the present invention. Especially during the processing of a large batch of welding joint impact specimens, by using this device, the processing accuracy of the specimens can be improved while greatly enhancing the processing efficiency.

[0042] (4) An apparatus and method for positioning the length and notch center of a welded joint impact specimen according to the present invention enable machinists to quickly inspect the dimensions of the machined impact specimen and the position of the notch through this apparatus after specimen machining, promptly detect defective specimens, and ensure machining quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is the front view of the apparatus of the present invention.

[0044] Figure 2 is the bottom view of the apparatus of the present invention.

[0045] Figure 3 is the left view of the apparatus of the present invention.

[0046] Figure 4 is the front view of a welded joint impact test blank.

[0047] Figure 5 is the left view of a welded joint impact test blank.

[0048] Figure 6 is the right view of a welded joint impact test blank.

[0049] Figure 7 is a schematic diagram of the scribing position at the center of the weld on the notch-opening surface of the impact test blank specimen.

[0050] Figure 8 is a schematic diagram of the scribing position at the center of the fusion line on the notch-opening surface of the impact test blank specimen.

[0051] Figure 9 is a schematic diagram of the scribing position at a position 1 mm outside the fusion line on the notch-opening surface of the impact test blank specimen.

[0052] Figure 10 is a schematic diagram of the scribing position at a position 2 mm outside the fusion line on the notch-opening surface of the impact test blank specimen.

[0053] Figure 11 is a schematic diagram of the scribing position at a position 5 mm outside the fusion line on the notch-opening surface of the impact test blank specimen.

[0054] Figure 12 is the front view when positioning at the center of the weld according to the present invention.

[0055] Figure 13 is the bottom view when positioning at the center of the weld according to the present invention.

[0056] Figure 14 is a schematic diagram when positioning at the center of the fusion line according to the present invention.

[0057] Figure 15It is a schematic diagram when the present invention is positioned at a position 5 mm outside the fusion line.

[0058] Figure 16 It is a front view of the impact specimen after positioning and machining a V-notch at the center position of the weld of the present invention.

[0059] Figure 17 It is a top view of the impact specimen after positioning and machining a V-notch at the center position of the weld of the present invention.

[0060] Figure 18 It is a specific steel needle as a marking tool in the present invention.

[0061] Among them, the specific descriptions of the reference numerals are as follows: base 1, positioning scale 2, first positioning scale 21, second positioning scale 22, third positioning scale 23, fourth positioning scale 24, notch 3, positioning notch edge 31, notch edge bevel 32, scale line 41, scale number 42, reference line 43, fusion line 5, first fusion line 51, second fusion line 52, first intersection point 61, second intersection point 62, notch center 7, notch center positioning line 71, first fixed-length line 81, second fixed-length line 82, steel needle 9, weld metal 10, heat affected zone 11, base metal 12, impact test blank 13. Specific embodiments

[0062] In order to better understand the purpose, structure and function of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0063] In the description of the present invention, it should be noted that the positional relationships indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. cited in this specification are based on the positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention.

[0064] Embodiment 1

[0065] Such as Figure 1 And Figure 2As shown in the figure, this embodiment provides a device for positioning the length and notch center of a welded joint impact specimen, which can be applied to impact specimens 13 with different thicknesses B. The device includes a base 1 and a transparent positioning scale 2. In this embodiment, the base 1 is a cuboid, the upper end face of the base 1 is square, the side length of the square upper end face of the base 1 is 80 mm, the thickness b of the base 1 is the same as the width W of the impact specimen 13, and the width W of the impact specimen 13 is 10 mm. Therefore, the thickness b of the base 1 is 10 mm. A positioning scale 2 is provided at the edge position of the upper end face of the base 1. The positioning scale 2 includes a first positioning scale 21, a second positioning scale 22, a third positioning scale 23, and a fourth positioning scale 24. The first positioning scale 21, the second positioning scale 22, the third positioning scale 23, and the fourth positioning scale 24 are respectively located at the edge positions on the four sides of the upper end face of the base 1. The positioning scale 2 is rectangular. According to the requirements in "GB / T 229 Metallic materials - Charpy pendulum impact test method", the length dimension of the impact specimen is 55 mm, and the length of the positioning scale 2 is the process requirement length of the welded joint impact specimen. Therefore, in this embodiment, the lengths of the positioning scales 2 provided at the edge positions of the upper end face of the base 1 are all 55 mm. The width of the base is greater than the thickness of the impact specimen. Here, the width of the base is 12 mm. The long side of the positioning scale 2 is closely fixed to the edge of the upper end face of the base 1, and the midpoint of the long side of the positioning scale 2 is located at the center position of the edge of the upper end face of the base 1.

[0066] Scale lines 41 and scale numbers 42 are marked on the positioning scale 2. The scale lines 41 and scale numbers 42 are located on the long side of the positioning scale 2 close to the base 1, and the distance from the scale lines 41 to the edge of the base is half of the thickness B of the impact specimen 13. The thickness B of the impact specimen 13 in this embodiment is 10 mm, that is, the height h of the scale lines 41 is 5 mm. The scale lines 41 are marked with 0 as the reference line 43 at the center position of the positioning scale 2, that is, the scale at the center position of the positioning scale 2 is 0 mm. The first positioning scale 21 is marked with scale values from 0 to 27.5 mm from the reference line 43 towards one end of the first positioning scale 21. The second positioning scale 22 is marked with scale values from 0 to 1 mm from the reference line 43 towards one end of the second positioning scale 22. The third positioning scale 23 is marked with scale values from 0 to 2 mm from the reference line 43 towards one end of the third positioning scale 23. The fourth positioning scale 24 is marked with scale values from 0 to 5 mm from the reference line 43 towards one end of the fourth positioning scale 24. The first positioning scale 21 is marked with scale values from x to 27.5 mm from the reference line 43 towards the other end of the first positioning scale 21, where x is the notch width, and the minimum scale is 1 mm. The positioning scale 2 marked with scale values from 0 to 27.5 mm is also marked with scale values from 0 to 27.5 mm from the reference line 43 towards the other end of the positioning scale 2.

[0067] The second positioning scale 22, the third positioning scale 23, and the fourth positioning scale 24 are provided with notches 3 starting from the center position towards the end of the positioning scale 2 without the scale line 41. The notch 3 is a rectangle with an outward opening. The first positioning scale 21 is provided with a notch 3 starting from the center position towards any end of the first positioning scale 21. At this time, the scale value of the first positioning scale 21 from the reference line 43 towards one end of the first positioning scale 21 is marked as the width x - 27.5 mm of the notch 3. In this example, the width x of the notch 3 is 2 mm, that is, the scales on the first positioning scale are 0 - 27.5 mm and 2 - 27.5 mm. The notch edge 31 of the notch 3 that coincides with the reference line 43 is the positioning notch edge, and a triangular notch edge chamfer 32 is provided on the notch edge of the notch 3 away from the reference line 43, which is convenient for the operator to distinguish when drawing the notch center positioning line 71.

[0068] There are text markings on the upper end surface of the base 1 near the positioning scale 2. On the upper end surface of the base 1 near the first positioning scale 21, it is marked with "Weld Center". On the upper end surface of the base 1 near the second positioning scale 22, it is marked with "1 mm outside the fusion line". On the upper end surface of the base 1 near the third positioning scale 23, it is marked with "2 mm outside the fusion line". On the upper end surface of the base 1 near the fourth positioning scale 24, it is marked with "5 mm outside the fusion line".

[0069] Embodiment 2

[0070] As Figure 12 and Figure 13 shown, in the method provided by this embodiment for using the device in Embodiment 1, for the specific operation of sizing and positioning the impact specimen blank 13 at the weld center position, the impact specimen blank 13 includes a welded joint, and the welded joint includes a weld, a first fusion line 51, and a second fusion line 52. The method includes the following steps:

[0071] Step 1. Pretreat the impact specimen blank 13:

[0072] Erode the impact specimen blank 13 with a chemical reagent to clearly show the fusion line 5 of the welded joint of the impact specimen blank.

[0073] Step 2. Place the notched surface of the impact specimen blank 13 under the positioning scale 2 marked with "Weld Center", and make the two fusion lines 5 of the impact specimen blank 13 located on both sides of the notch 3 of the positioning scale. Then, move the impact specimen blank 13 towards the device until the impact specimen blank 13 is close to the base 1.

[0074] Step 3: Move the device along the length direction of the impact specimen 13. The intersection point of the first fusion line 51 and the scale line 41 on the positioning scale is the first intersection point 61, and the intersection point of the second fusion line 52 and the scale line 41 on the positioning scale is the second intersection point 62. When the scale values of the first intersection point 61 and the second intersection point 62 on the scale line 41 are equal, the position on the impact specimen 13 at the edge of the positioning groove 31 is the weld center position;

[0075] Step 4: Use a marking tool to respectively draw a slender notch center positioning line 71, a first fixed-length line 81, and a second fixed-length line 82 on the impact specimen 13. The marking tool includes but is not limited to a steel needle 9 or a pencil. As Figure 18 shown, in this embodiment, a specific steel needle 9 with a hard and sharp head is used. The hardness of the sharp head of the steel needle 9 is greater than 60 HRC. On the impact specimen 13, use the steel needle 9 to draw the notch center positioning line 71 close to the edge of the positioning groove 31 at the weld center position, and draw the first fixed-length line 81 and the second fixed-length line 82 respectively close to both ends of the positioning scale 2.

[0076] Step 5: Process the impact specimen 13 using a machining device:

[0077] When the machining device used is a broaching machine, it is necessary to first perform end cutting on the impact specimen 13 according to the first fixed-length line 81 and the second fixed-length line 82, and then place one end of the sawn impact specimen 13 close to the end positioning device of the broaching machine. Use the broaching machine to automatically broach a notch with the dimensions and shape specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test method" at a distance of 27.5 mm from the end of the impact specimen 13. In this embodiment, use the broaching machine to perform end cutting and notch machining on the impact specimen 13, as Figure 16 and Figure 17 shown. The length of the processed impact specimen is 55 mm, and the notch is V-shaped;

[0078] When the machining device used is a milling machine, a grinding machine, or an electro-discharge machining machine, etc., based on the notch center positioning line 71, a notch with the dimensions and shape specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test method" can be directly broached.

[0079] Example 3

[0080] As Figure 14 shown, in this embodiment, a method using the device in Example 1 provides specific operations for determining the length and position of the impact specimen 13 at the center position of the fusion line 5. The impact specimen 13 includes a welded joint, and the welded joint includes a weld, a first fusion line 51, and a second fusion line 52. The method includes the following steps,

[0081] Step 1: Pretreat the impact specimen 13:

[0082] Erode the impact sample blank 13 with chemical reagents to clearly display the fusion line 5 of the welded joint of the impact sample blank;

[0083] Step 2: Place the notched surface of the impact sample blank 13 under any one of the positioning scales 2, and then move the impact sample blank 13 towards the device until the impact sample blank 13 abuts against the base 1;

[0084] Step 3: Move the device along the length direction of the impact sample blank 13. The intersection point of the first fusion line 51 and the scale line 41 on the positioning scale is the first intersection point 61, and the intersection point of the second fusion line 52 and the scale line 41 on the positioning scale is the second intersection point 62. When the scale value of the first intersection point 61 or the second intersection point 62 on the scale line 41 is 0, the position of the impact sample blank 13 at the edge of the positioning groove 31 is the center position of the fusion line 5;

[0085] Step 4: Use a marking tool to respectively draw a slender notch center positioning line 71, a first fixed-length line 81, and a second fixed-length line 82 on the impact sample blank 13. The marking tool includes but is not limited to a steel needle 9 or a pencil. As Figure 18 shown, in this embodiment, a specific steel needle 9 with a hard and sharp head is used. The hardness of the sharp head of the steel needle 9 is greater than 60 HRC. Use the steel needle 9 to draw the notch center positioning line 71 at the center position of the fusion line 5, and draw the first fixed-length line 81 and the second fixed-length line 82 at both ends of the impact sample blank 13 located at the positioning scale 2 respectively.

[0086] Step 5: Process the impact sample blank 13 using a machining device:

[0087] When the machining device used is a broaching machine, it is necessary to first cut the ends of the impact sample blank 13 according to the first fixed-length line 81 and the second fixed-length line 82, and then place one end of the sawed impact sample blank 13 against the end positioning device of the broaching machine. Use the broaching machine to automatically broach a notch with the size and shape specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test" at a distance of 27.5 mm from the end of the impact sample blank 13;

[0088] When the machining device used is a milling machine, a grinding machine, or an electro-discharge machining machine, etc., with the notch center positioning line 71 as the reference, a notch with the size and shape specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test" can be directly broached.

[0089] Example 4

[0090] In the method provided in this embodiment that utilizes the device in Embodiment 1, the specific operations of sizing and positioning the impact specimen blank 13 at a position 5 mm outside the fusion line 5 are as follows. The impact specimen blank 13 includes a welded joint, and the welded joint includes a weld seam, a first fusion line 51, and a second fusion line 52. The method includes the following steps:

[0091] Step 1. Pretreat the impact specimen blank 13:

[0092] Erode the impact specimen blank 13 with a chemical reagent to clearly display the fusion line 5 of the welded joint of the impact specimen blank.

[0093] Step 2. Place the notched surface of the impact specimen blank 13 under the positioning scale 2 marked with "5 mm outside the fusion line 5" or "center of the weld seam". As Figure 15 shown, in this embodiment, the impact specimen blank 13 is placed under the positioning scale 2 marked with "5 mm outside the fusion line 5", which can make the positioning operation more simple and rapid. Then, move the impact specimen blank 13 towards the device until the impact specimen blank 13 abuts against the base 1.

[0094] Step 3. Move the device along the length direction of the impact specimen blank 13. The intersection point of the first fusion line 51 and the scale line 41 on the positioning scale is the first intersection point 61, and the intersection point of the second fusion line 52 and the scale line 41 on the positioning scale is the second intersection point 62. When the scale value of the first intersection point 61 close to the positioning groove edge 31 or the second intersection point 62 close to the positioning groove edge 31 on the scale line 41 is 5, the position of the impact specimen blank 13 at the positioning groove edge 31 is the position 5 mm outside the fusion line 5.

[0095] Step 4. Use a marking tool to respectively scribe a slender notch center positioning line 71, a first sizing line 81, and a second sizing line 82 on the impact specimen blank 13. The marking tool includes but is not limited to a steel needle 9 or a pencil. As Figure 18 shown, in this embodiment, a specific steel needle 9 with a hard and sharp head is used. The hardness of the sharp head of the steel needle 9 is greater than 60 HRC. Use the steel needle 9 to scribe the notch center positioning line 71 at the center position of the weld metal, and scribe the first sizing line 81 and the second sizing line 82 at both ends of the impact specimen blank 13 where it is located on the positioning scale 2.

[0096] Step 5. Process the impact specimen blank 13 using a machining device:

[0097] When the machining equipment used is a broaching machine, it is necessary to first perform end cutting on the impact specimen blank 13 according to the first fixed-length line 81 and the second fixed-length line 82, and then place one end of the sawn impact specimen blank 13 close to the end positioning device of the broaching machine. The broaching machine can automatically use a broach to cut a notch with the size and shape specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test" at a distance of 27.5 mm from the end of the impact specimen blank 13;

[0098] When the machining equipment used is a milling machine, a grinding machine or an electro-discharge erosion machine tool, etc., with the notch center positioning line 71 as the reference, a notch with the size and shape specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test" can be directly cut.

[0099] Example 5

[0100] This example provides a method using the device in Example 1 for the specific operation of determining the length and positioning of the impact specimen blank 13 at a position 2 mm outside the fusion line 5. The impact specimen blank 13 includes a welded joint, and the welded joint includes a weld seam, a first fusion line 51 and a second fusion line 52. The method includes the following steps:

[0101] Step 1. Pretreat the impact specimen blank 13:

[0102] Erode the impact specimen blank 13 with a chemical reagent to clearly show the fusion line 5 of the welded joint of the impact specimen blank.

[0103] Step 2. Place the notch-opening surface of the impact specimen blank 13 under the positioning scale 2 marked with "2 mm outside the fusion line 5", "5 mm outside the fusion line 5" or "center of the weld seam". In this example, place the impact specimen blank 13 under the positioning scale 2 marked with "2 mm outside the fusion line 5", which can make the positioning operation simpler and faster. Then, move the impact specimen blank 13 towards the device until the impact specimen blank 13 is close to the base 1;

[0104] Step 3. Move the device along the length direction of the impact specimen blank 13. The intersection of the first fusion line 51 and the scale line 41 on the positioning scale is the first intersection point 61, and the intersection of the second fusion line 52 and the scale line 41 on the positioning scale is the second intersection point 62. When the scale value of the first intersection point 61 close to the positioning groove edge 31 or the second intersection point 62 close to the positioning groove edge 31 on the scale line 41 is 2, the position of the impact specimen blank 13 at the positioning groove edge 31 is the position 2 mm outside the fusion line 5;

[0105] Step 4. Use a marking tool to respectively draw a slender notch center positioning line 71, a first fixed-length line 81 and a second fixed-length line 82 on the impact specimen blank 13. The marking tool includes but is not limited to a steel needle 9 or a pencil, such as Figure 18As shown, in this embodiment, a specific steel needle 9 with a hard and sharp head is used. The hardness of the sharp head of the steel needle 9 is greater than 60 HRC. The steel needle 9 is used to scribe a notch center positioning line 71 at the center position of the weld metal, and a first fixed-length line 81 and a second fixed-length line 82 are respectively scribed at both ends of the impact specimen blank 13 located at the two ends of the positioning scale 2.

[0106] Step Five: Process the impact specimen blank 13 using a machining device:

[0107] When the machining device used is a broaching machine, it is necessary to first cut the ends of the impact specimen blank 13 according to the first fixed-length line 81 and the second fixed-length line 82, and then place one end of the sawn impact specimen blank 13 close to the end positioning device of the broaching machine. The broaching machine can automatically broach a notch with dimensions and shapes specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test method" at a position 27.5 mm away from the end of the impact specimen blank 13.

[0108] When the machining device used is a milling machine, a grinding machine, or an electro-discharge machining machine, etc., with the notch center positioning line 71 as the reference, a notch with dimensions and shapes specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test method" can be directly broached.

[0109] Example 6

[0110] In this embodiment, a method using the device in Example 1 provides specific operations for sizing and positioning the impact specimen blank 13 at a position 1 mm outside the fusion line 5. The impact specimen blank 13 includes a welded joint, and the welded joint includes a weld, a first fusion line 51, and a second fusion line 52. The method includes the following steps.

[0111] Step One: Pretreat the impact specimen blank 13:

[0112] Erode the impact specimen blank 13 using a chemical reagent to clearly show the fusion line 5 of the welded joint of the impact specimen blank.

[0113] Step Two: Place the notched surface of the impact specimen blank 13 under any one of the positioning scales 2. In this embodiment, the impact specimen blank 13 is placed under the positioning scale 2 marked with "1 mm outside the fusion line 5", which can make the positioning operation simpler and faster. Then, move the impact specimen blank 13 towards the device until the impact specimen blank 13 abuts against the base 1.

[0114] Step 3: Move the device along the length direction of the impact specimen 13. The intersection point of the first fusion line 51 and the scale line 41 on the positioning scale is the first intersection point 61, and the intersection point of the second fusion line 52 and the scale line 41 on the positioning scale is the second intersection point 62. When the scale value of the first intersection point 61 close to the positioning groove edge 31 or the second intersection point 62 close to the positioning groove edge 31 on the scale line 41 is 1, the position of the impact specimen 13 at the positioning groove edge 31 is the position 1 mm outside the fusion line 5;

[0115] Step 4: Use a marking tool to respectively draw a slender notch center positioning line 71, a first fixed-length line 81, and a second fixed-length line 82 on the impact specimen 13. The marking tool includes but is not limited to a steel needle 9 or a pencil. As Figure 18 shown, in this embodiment, a specific steel needle 9 with a hard and sharp head is used. The hardness of the sharp head of the steel needle 9 is greater than 60 HRC. Use the steel needle 9 to draw the notch center positioning line 71 at the center position of the weld metal, and draw the first fixed-length line 81 and the second fixed-length line 82 at both ends of the impact specimen 13 located at the positioning scale 2 respectively.

[0116] Step 5: Process the impact specimen 13 using a machining device:

[0117] When the machining device used is a broaching machine, it is necessary to first cut the ends of the impact specimen 13 according to the first fixed-length line 81 and the second fixed-length line 82, and then place one end of the sawed impact specimen 13 close to the end positioning device of the broaching machine. Use the broaching machine to automatically broach a notch with dimensions and shapes specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test method" at a distance of 27.5 mm from the end of the impact specimen 13;

[0118] When the machining device used is a milling machine, a grinding machine, or an electro-discharge machining machine, etc., with the notch center positioning line 71 as the reference, a notch with dimensions and shapes specified in the "GB / T 229 Metallic materials - Charpy pendulum impact test method" can be directly broached.

[0119] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any changes or equivalent replacements to these features and embodiments can be made by those skilled in the art without departing from the spirit and scope of the present invention. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A device for positioning the length and notch center of a welded joint impact specimen, characterized in that, The device includes a base (1) and a transparent positioning scale (2). At the edge position of the upper end face of the base (1), a positioning scale (2) is provided. The positioning scale (2) includes a first positioning scale (21), and the first positioning scale (21) is located at the edge position of any one side of the upper end face of the base (1). The positioning scale (2) is rectangular, and the long side of the positioning scale (2) is closely fixed to the edge of the upper end face of the base (1). The length of the positioning scale (2) is the process requirement length of the impact specimen of the welded joint. Scale lines (41) and scale numbers (42) are marked on the positioning scale (2). The distance from the scale line (41) to the edge of the base is half of the thickness of the impact sample blank (13). The scale line (41) takes the mid-position of the positioning scale (2) as the reference line (43) and is marked as 0. A notch (3) is provided on the positioning scale (2) from the reference line (43) towards one end of the positioning scale (2). The notch (3) is a rectangle with an opening facing outwards, and the notch edge of the notch (3) coinciding with the reference line (43) is the positioning notch edge (31).

2. The device for positioning the length and notch center of a welded joint impact specimen according to claim 1, characterized in that, The positioning scale (2) further includes a second positioning scale (22), a third positioning scale (23), and a fourth positioning scale (24), and the second positioning scale (22), the third positioning scale (23), and the fourth positioning scale (24) are respectively located at the edge positions of the other three sides of the upper end face of the base (1).

3. The device for positioning the length and notch center of a welded joint impact specimen according to claim 2, wherein The first positioning scale (21) is marked with scale values from 0 to 27.5 mm from the reference line (43) towards one end of the first positioning scale (21). The second positioning scale (22) is marked with scale values from 0 to 1 mm from the reference line (43) towards one end of the second positioning scale (22). The third positioning scale (23) is marked with scale values from 0 to 2 mm from the reference line (43) towards one end of the third positioning scale (23). The fourth positioning scale (24) is marked with scale values from 0 to 5 mm from the reference line (43) towards one end of the fourth positioning scale (24). The first positioning scale (21) is marked with scale values from x to 27.5 mm from the reference line (43) towards the other end of the first positioning scale (21), where x is the notch width and the minimum scale is 1 mm.

4. The device for positioning the length and notch center of a welded joint impact specimen according to claim 2, characterized in that, The base (1) is a cuboid, the upper end face of the base (1) is square, and the thickness of the base (1) is the same as the width of the impact sample blank (13).

5. The device for positioning the length and notch center of a welded joint impact specimen according to claim 2, characterized in that, The length of the positioning scale (2) is 55 mm, and the midpoint of the long side of the positioning scale (2) is located at the mid-position of the side of the base (1).

6. A device for positioning the length and notch center (7) of a welded joint impact specimen according to claim 2, characterized in that, The notch edge of the notch (3) far from the reference line (43) is processed into a notch bevel (32), and the notch bevel (32) is triangular.

7. A device for positioning the length and notch center of a welding joint impact specimen according to claim 2, characterized in that, Text markings are provided on the upper end face of the base (1) near the positioning scale (2). On the upper end face of the base (1) near the first positioning scale (21), it is marked with "Weld Center"; on the upper end face of the base (1) near the second positioning scale (22), it is marked with "1 mm outside the fusion line"; on the upper end face of the base (1) near the third positioning scale (23), it is marked with "3 mm outside the fusion line"; on the upper end face of the base (1) near the fourth positioning scale (24), it is marked with "5 mm outside the fusion line".

8. A method for positioning the length and notch center of an impact specimen for a welded joint, wherein the impact specimen is obtained by machining an impact test blank (13), the impact test blank (13) includes a welded joint, the welded joint includes a weld seam, a first fusion line (51) and a second fusion line (52), and the positions of the notch center (7) include the weld seam center, the fusion line center, positions 1 mm outside the fusion line (5), 2 mm outside the fusion line (5), and 5 mm outside the fusion line (5), characterized in that, With the device according to any one of claims 1-7, position the length of the impact specimen blank (13) and the notch center (7). The method includes the following steps: Step 1: Pre-treat the impact specimen blank (13). Erode the impact specimen blank (13) with a chemical reagent to clearly display the fusion line (5) of the welded joint of the impact specimen blank. Step 2: Place the notched surface of the impact specimen blank (13) under the transparent positioning scale (2). Move the impact specimen blank (13) towards the device until the impact specimen blank (13) abuts against the base (1). Step 3: Move the device along the length direction of the impact specimen blank (13). The intersection point of the first fusion line (51) and the scale line (41) on the positioning scale is the first intersection point (61), and the intersection point of the second fusion line (52) and the scale line (41) on the positioning scale is the second intersection point (62). Determine the position of the notch center (7) on the impact specimen blank (13) according to the scale value of the first intersection point (61) on the scale line (41) and / or the scale value of the second intersection point (62) on the scale line (41). Step 4: Use a marking tool to respectively draw slender notch center positioning lines (71), first fixed-length lines (81), and second fixed-length lines (82) on the impact specimen blank (13). Step 5: Use a machining device for machining. Machine the length of the impact specimen blank (13) according to the first fixed-length line (81) and the second fixed-length line (82), and machine the notch of the impact specimen blank (13) according to the notch center positioning line (71).

9. A method for positioning the length and notch center of an impact specimen for a welded joint, according to claim 8, characterized in that In the said Step 3, the specific operation steps for determining the position of the notch center (7) on the impact specimen blank (13) according to the scale value of the first intersection point (61) and / or the second intersection point (62) on the scale line (41) include: When the scale value of the first intersection point (61) on the scale line (41) is equal to the scale value of the second intersection point (62) on the scale line (41), the weld center position at the positioning groove edge (31) on the impact specimen blank (13) is the notch center position. When the scale value of the first intersection point (61) or the second intersection point (62) on the scale line (41) is 0, the center position of the fusion line (5) at the positioning groove edge (31) on the impact specimen blank (13) is the notch center position. When the scale value of the first intersection point (61) close to the positioning groove edge (31) or the second intersection point (62) close to the positioning groove edge (31) on the scale line (41) is 1, the position 1 mm outside the fusion line (5) at the positioning groove edge (31) on the impact specimen blank (13) is the notch center position. When the scale value of the first intersection point (61) close to the positioning groove edge (31) or the second intersection point (62) close to the positioning groove edge (31) on the scale line (41) is 2, the position 2 mm outside the fusion line (5) at the positioning groove edge (31) on the impact specimen blank (13) is the notch center position. When the scale value of the first intersection point (61) near the positioning groove edge (31) or the second intersection point (62) near the positioning groove edge (31) on the scale line (41) is 5, the position 5 mm outside the fusion line (5) at the positioning groove edge (31) on the impact test piece (13) is the notch center position.

10. A method for positioning the length and notch center of an impact specimen for a welded joint according to claim 8, characterized in that, In the fourth step, the specific steps of using a marking tool to respectively draw the slender notch center positioning line (71), the first fixed length line (81) and the second fixed length line (82) on the impact test piece (13) include: on the impact test piece (13), using a marking tool to draw the slender notch center positioning line (71) along the positioning groove edge (31) at the notch center (7) position, and at the same time, using a marking tool to draw the first fixed length line (81) and the second fixed length line (82) along the two end edges of the positioning scale (2) on the impact test piece (13).

11. A method for positioning the length and notch center of an impact specimen for a welded joint according to claim 8, characterized in that, In the fifth step, the specific steps of processing using a machining device include: When the machining device used is a broaching machine, it is necessary to first cut the ends of the impact test piece (13) according to the first fixed length line (81) and the second fixed length line (82), and then place one end of the sawed impact test piece (13) against the end positioning device of the broaching machine, and use the broaching machine to automatically broach a notch with the dimensions and shape of the impact test specimen specified by the process requirements at a distance of 27.5 mm from the end of the impact test piece (13) with a broach; When the machining device used is a milling machine, a grinding machine or an electro-discharge machining machine, based on the notch center positioning line (71), a notch with the dimensions and shape of the impact test specimen specified by the process requirements can be directly broached.

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