Welding positioning device and welding process

Abstract

The embodiment of the invention provides a welding positioning device and a welding process, and relates to the technical field of welding, and the welding positioning device comprises a dowel bar, a cam, a fixing piece, a plurality of ejector rods and a plurality of calibration plates. The dowel bar is fixedly connected with the cam, and the cam is provided with a plurality of convex surfaces and a plurality of concave surfaces which are equal in number; the fixing part is provided with an assembly hole and a plurality of guide holes communicated with the assembly hole, the cam is rotatably matched with the assembly hole, the guide holes are distributed in the circumferential direction of the assembly hole at intervals, and the number of the guide holes is equal to that of the convex faces or the concave faces. The included angle between any two adjacent convex surfaces, the included angle between any two adjacent concave surfaces and the included angle between any two adjacent guide holes are equal; an ejector rod is slidably mounted in each guide hole, and the end of each ejector rod makes contact with the corresponding concave face or the corresponding convex face. The multiple calibration plates are matched with the multiple ejector rods in a one-to-one correspondence mode, and each calibration plate and the corresponding ejector rod can be adjusted in a lockable mode in the length direction of the ejector rod. The welding quality is high.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a welding positioning device and a welding process. Background Art

[0002] The most common welding operation in the shipbuilding process is the welding and installation of pipe fittings and flange pipes. Currently, handheld welding is generally used. The alignment deviation of pipe fittings and flange pipes is large, and they are prone to displacement during the welding process, resulting in low installation accuracy and low welding quality. Summary of the invention

[0003] The objects of the present invention include, for example, providing a welding positioning device and a welding process, which can achieve welding positioning and improve welding accuracy and welding quality.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides a welding positioning device for positioning a flange pipe and a pipe fitting to be welded, comprising:

[0006] A force transmission rod, a cam, a fixing member, a plurality of push rods and a plurality of calibration plates; the force transmission rod is fixedly connected to the cam and the two are coaxially arranged; the cam is provided with a plurality of convex surfaces and a plurality of concave surfaces of equal number, and the plurality of convex surfaces and the plurality of concave surfaces are arranged alternately in sequence in the circumferential direction of the cam; the fixing member is provided with an assembly hole and a plurality of guide holes connected to the assembly hole, the cam is rotatably matched with the assembly hole, the plurality of guide holes are arranged at intervals in the circumferential direction of the assembly hole, the number of the guide holes is equal to the number of the convex surfaces or the concave surfaces, the angle between any adjacent convex surfaces, the angle between any adjacent concave surfaces and the angle between any adjacent guide holes are all equal; a push rod is slidably installed in each of the guide holes, and the end of the push rod is in contact with the concave surface or the convex surface; a plurality of calibration plates are respectively matched with a plurality of push rods one by one, and each calibration plate and the corresponding push rod can be locked and adjusted in the length direction of the push rod.

[0007] In an optional embodiment, the cam is provided with a fixing hole, and the force transmission rod is inserted into the fixing hole and has an interference fit with the fixing hole.

[0008] Based on the above scheme, the assembly method of the force transmission rod and the fixing hole is simple and reliable, and the assembly efficiency is high.

[0009] In an optional embodiment, the welding positioning device also includes two pressure plates, each of which is provided with a bearing, and the two pressure plates are respectively located on both sides of the fixing member and fixedly connected to the fixing member; the force transmission rod is simultaneously passed through the inner rings of the two bearings and has an interference fit with the inner rings.

[0010] Based on the above scheme, the cam is clamped in the assembly hole of the fixing member by connecting the two pressure plates to the fixing member, thereby preventing the cam from moving in the axial direction of the assembly hole and improving the stability of the cam position. In addition, the force transmission rod is positioned by two bearings, the force transmission rod and the cam have a high coaxiality, and the force transmission rod drives the cam to rotate more labor-saving.

[0011] In an optional embodiment, the push rod includes a round rod segment, a force rod segment and a threaded rod segment that are connected in sequence and coaxially arranged, and the round rod segment is slidably matched with the guide hole; the calibration plate is screwed and fixed to the threaded rod segment; a limiting step surface is formed at the connection between the force rod segment and the threaded rod segment, and the limiting step surface is used to abut against the calibration plate to limit the movement of the calibration plate toward the force rod segment; the force rod segment is used to cooperate with a tool to drive the push rod to rotate in the guide hole through the tool.

[0012] Based on the above scheme, when adjusting the initial position of the calibration plate, the calibration plate can be inserted into the pipe fitting or flange pipe, the edge of the calibration plate contacts the inner wall of the pipe, and is clamped with the force rod segment through tools such as wrenches. Force is applied to the wrench to drive the force rod segment to rotate, thereby making the calibration plate rise or fall, and the position of the calibration plate can be adjusted conveniently.

[0013] In an optional embodiment, the welding positioning device further includes a locking nut, which is threadedly fixed to the threaded rod segment, and the locking nut is used to abut against the calibration plate to limit the calibration plate from sliding in a direction away from the cam.

[0014] Based on the above solution, after the position adjustment of the calibration plate is completed, a locking nut is used to fit on top of the calibration plate to improve the stability of the position of the calibration plate.

[0015] In an optional embodiment, the calibration plate is configured as a concave plate, and the two side surfaces of the calibration plate in the width direction are configured as arc surfaces; a threaded hole is provided on the bottom wall of the groove of the calibration plate, and the threaded hole is screwed and fixed to the threaded rod segment.

[0016] Based on the above scheme, both sides of the calibration plate can contact with the inner pipe walls of the pipe fittings and the flange pipe, with a large contact area, high supporting balance and good positioning effect.

[0017] In an optional embodiment, the length of the threaded rod segment is smaller than the groove depth of the calibration plate, and the groove depth direction of the calibration plate is consistent with the length direction of the threaded rod segment.

[0018] Based on the above scheme, when the height of the calibration plate is adjusted so that it contacts the inner wall of the pipe fitting or flange pipe, the height of the two side edges of the calibration plate is always higher than the end position of the threaded rod segment, thereby avoiding interference between the threaded rod segment and the inner wall of the pipe.

[0019] In an optional embodiment, a first identification portion is provided on the fixing member, and a second identification portion is provided on both the concave surface and the convex surface, and the first identification portion is used to align with the second identification portion when the convex surface or the concave surface is opposite to the guide hole.

[0020] Based on the above solution, when the force transmission rod is rotated to drive the cam to rotate, the first identification part and the second identification part cooperate to intuitively obtain the matching state of the cam and the push rod, and the adjustment is convenient and accurate. It should be understood that the types of identification parts on the convex surface and the concave surface can be set to be different, so that it can be more clearly known whether it is the concave surface or the convex surface that cooperates with the push rod, further improving the efficiency of the operation.

[0021] In a second aspect, the present invention provides a welding process, which is applied to the welding positioning device described in any one of the aforementioned embodiments, and the welding process comprises the following steps:

[0022] Step s100, applying force to the rotating rod to drive the cam to rotate, and aligning the concave surface of the cam with the guide hole;

[0023] Step s200, placing the calibration plate in the flange tube on the positioning platform, applying force to the rotating rod to drive the cam to rotate, aligning the convex surface of the cam with the guide hole, and making the end of each push rod contact with the convex surface; adjusting the position of each calibration plate to make it contact with the inner wall of the flange tube, and then locking the calibration plate on the push rod;

[0024] Step s300, applying force to the rotating rod to drive the cam to rotate and make the convex surface leave the guide hole so that all the calibration plates move toward the middle;

[0025] Step s400, sleeve the welded pipe fittings outside the plurality of calibration plates, so that the ends of the pipe fittings are aligned with the ends of the flange pipes; apply force to the rotating rod to drive the cam to rotate, and make the convex surface abut against the push rod, so that the calibration plate is in contact with the inner wall of the flange pipe and the inner wall of the pipe fitting at the same time;

[0026] Step s500: Weld the flange pipe and the pipe fitting by symmetrical spot welding.

[0027] In an optional embodiment, after step s500, the welding positioning device is removed, and the flange pipe and the pipe fitting are fully welded in a symmetrical manner.

[0028] Based on the above scheme, full welding can improve the fixing firmness of flange pipes and pipe fittings, improve the safety of the use process, and extend the service life.

[0029] The beneficial effects of the embodiments of the present invention include, for example:

[0030] In summary, the welding positioning device provided in this embodiment can provide positioning for the flange pipe and the pipe fittings when welding the flange pipe and the pipe fittings, ensure that the position of the flange pipe and the pipe fittings during the welding process is accurate and reliable, not easy to shift, and improve the welding quality. Specifically, the welding positioning device can be matched with the flange pipe first to adjust the position of the calibration plate. For example, the force transmission rod can be rotated first, so that the force transmission rod drives the cam to rotate, so that the concave surface on the cam cooperates with the push rod. In this way, the height of the push rod is the lowest, and the position of the calibration plate is low, which is convenient for placing multiple calibration plates in the lumen of the flange pipe. Then, the force transmission rod is rotated to drive the cam to rotate, so that the convex surface of the cam cooperates with the push rod, and the push rod is lifted to the highest position. Then, the position of the calibration plate is adjusted to make it fit with the inner wall of the flange pipe, and the position of the calibration plate is fixed at this time. Continue to operate the force transmission rod, so that the concave surface of the cam cooperates with the push rod, the push rod descends, and drives the calibration plate to descend. At this time, the calibration plate is separated from the inner wall of the flange pipe, and multiple calibration plates are gathered toward the middle. Then, the pipe fitting is sleeved outside the multiple calibration plates, and the multiple calibration plates are simultaneously inserted into the flange pipe and the pipe fitting, and force is applied to the force transmission rod, and the cam is driven to rotate through the force transmission rod. When the cam rotates to the point where the convex surface contacts the push rod, the multiple calibration plates simultaneously contact the pipe fitting and the inner wall of the flange pipe, so that the flange pipe and the pipe fitting are coaxial, and the relative position of the flange pipe and the pipe fitting is fixed, and the two are not easily misaligned in the radial direction, so welding is convenient and the welding quality is high. After welding is completed, the concave surface of the cam is matched with the push rod, the calibration plate is retracted away from the inner wall of the pipe, and the welding positioning device can be taken out from the pipe mouth side of the flange pipe, which can be repeatedly used and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic diagram of a welding positioning device according to an embodiment of the present application from one perspective;

[0033] Figure 2 A schematic diagram of a welding positioning device from another perspective of an embodiment of the present application;

[0034] Figure 3 A schematic diagram of a calibration plate of a welding positioning device according to an embodiment of the present application after position adjustment;

[0035] Figure 4 A schematic diagram of a cam according to an embodiment of the present application;

[0036] Figure 5 Schematic diagram of a fixing member according to an embodiment of the present application.

[0037] icon:

[0038] 001-flange pipe; 002-pipe fitting; 100-force transmission rod; 200-cam; 210-convex surface; 220-concave surface; 230-fixing hole; 300-fixing piece; 310-assembly hole; 320-guide hole; 400-thrust rod; 410-round rod section; 420-force rod section; 430-threaded rod section; 500-calibration plate; 600-pressure plate; 610-bearing; 700-locking nut; 800-countsunk screw. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0044] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0045] Please combine Figure 1 In this embodiment, it should be understood that the welding positioning device is used to position the flange pipe 001 and the pipe fitting 002 to be welded. The lumens of the flange pipe 001 and the pipe fitting 002 are both cylindrical lumens, and the lumens of the two are the same in diameter. The welding positioning device can ensure that the flange pipe 001 and the pipe fitting 002 are always in a coaxial state during the welding process and are not prone to radial displacement, thereby improving welding efficiency and welding quality.

[0046] Please combine Figure 1-Figure 5 In this embodiment, the welding positioning device includes a force transmission rod 100, a cam 200, a fixing member 300, a plurality of push rods 400 and a plurality of calibration plates 500. The force transmission rod 100 is fixedly connected to the cam 200 and the two are coaxially arranged; the cam 200 is provided with a plurality of convex surfaces 210 and a plurality of concave surfaces 220 of equal number, and the plurality of convex surfaces 210 and the plurality of concave surfaces 220 are alternately arranged in sequence in the circumferential direction of the cam 200; the fixing member 300 is provided with an assembly hole 310 and a plurality of guide holes 320 connected to the assembly hole 310, the cam 200 is rotatably matched with the assembly hole 310, and the plurality of guide holes 320 are arranged at intervals in the circumferential direction of the assembly hole 310, and the number of guide holes 320 is equal to 1. The amount is equal to the number of convex surfaces 210 or concave surfaces 220, the angle between any adjacent convex surfaces 210, the angle between any adjacent concave surfaces 220 and the angle between any adjacent guide holes 320 are all equal; a push rod 400 is slidably installed in each guide hole 320, and the end of the push rod 400 is in contact with the concave surface 220 or the convex surface 210; multiple calibration plates 500 are respectively matched with multiple push rods 400 one by one, and each calibration plate 500 and the corresponding push rod 400 can be locked and adjusted in the length direction of the push rod 400.

[0047] The number of the convex surface 210, the concave surface 220, the guide hole 320, the push rod 400 and the calibration piece is equal. For example, in this embodiment, the number of the convex surface 210, the concave surface 220, the guide hole 320, the push rod 400 and the calibration piece is three. In addition, in an optional embodiment, the angle between adjacent convex surfaces 210 is 120°, and the angle between adjacent concave surfaces 220 is 120°. Thus, the angle between adjacent convex surfaces 210 and concave surfaces 220 is 60°. Correspondingly, the angle between adjacent guide holes 320 is 120°.

[0048] As described above, the working method of the welding positioning device provided in this embodiment includes, for example:

[0049] The welding positioning device can be matched with the flange pipe 001 to adjust the position of the calibration plate 500. For example, the force transmission rod 100 can be rotated first, so that the force transmission rod 100 drives the cam 200 to rotate, so that the concave surface 220 on the cam 200 cooperates with the push rod 400. In this way, the push rod 400 extends to the lowest height, and the position of the calibration plate 500 is low, which is convenient for placing multiple calibration plates 500 in the lumen of the flange pipe 001. Then, the force transmission rod 100 is rotated to drive the cam 200 to rotate, so that the convex surface 210 of the cam 200 cooperates with the push rod 400, and the push rod 400 is lifted to the highest position. Then, the position of the calibration plate 500 is adjusted to fit the inner wall of the flange pipe 001, and the calibration plate 500 is fixed at the current position. Continue to operate the force transmission rod 100, so that the concave surface 220 of the cam 200 cooperates with the push rod 400, and the push rod 400 descends, driving the calibration plate 500 to descend. At this time, the calibration plate 500 is separated from the inner wall of the flange pipe 001, and the multiple calibration plates 500 are gathered toward the middle. Then, the pipe fitting 002 is sleeved outside the multiple calibration plates 500, and the multiple calibration plates 500 are simultaneously inserted into the flange pipe 001 and the pipe fitting 002, and force is applied to the force transmission rod 100, and the cam 200 is driven to rotate through the force transmission rod 100. When the cam 200 rotates to the convex surface 210 and contacts the push rod 400, the multiple calibration plates 500 are simultaneously in contact with the pipe fitting 002 and the inner wall of the flange pipe 001, so that the flange pipe 001 and the pipe fitting 002 are coaxial, and the relative position of the flange pipe 001 and the pipe fitting 002 is fixed, and the two are not easy to stagger in the radial direction, which is convenient for welding and has high welding quality. After welding is completed, the concave surface 220 of the cam 200 is matched with the push rod 400, and the calibration plate 500 is retracted away from the inner wall of the pipe. The welding positioning device can be taken out from the pipe mouth side of the flange pipe 001. It can be reused many times and has low cost.

[0050] The following embodiments illustrate the details of the welding positioning device of the present application by way of examples.

[0051] Please combine Figure 4 In this embodiment, optionally, a fixing hole 230 is provided in the middle position of the cam 200 , and the fixing hole 230 may be a cylindrical through hole, and the force transmission rod 100 is passed through the fixing hole 230 and has an interference fit with the fixing hole 230 .

[0052] With such a design, the force transmission rod 100 can be inserted into the fixing hole 230 to achieve the installation and matching of the force transmission rod 100 and the cam 200. The assembly method is simple and reliable, and the assembly efficiency is high.

[0053] Please combine Figure 1 and Figure 2In this embodiment, optionally, the welding positioning device further includes two pressing plates 600, each of which can be a circular plate, and a circular hole can be set in the middle of each pressing plate 600, and a bearing 610 is installed in each circular hole. The two pressing plates 600 are respectively fixed to the two sides of the fixing member 300 by screws, and each pressing plate 600 can be fixedly connected to the fixing member 300 by a plurality of countersunk screws 800 to improve stability. During installation, the force transmission rod 100 is simultaneously inserted into the inner rings of the two bearings 610 and has an interference fit with the inner rings. After the installation is completed, the force transmission rod 100, the cam 200 and the two pressing plates 600 are coaxially arranged.

[0054] It should be understood that the two pressing plates 600 are connected to the fixing member 300, so that the cam 200 is clamped in the assembly hole 310 of the fixing member 300, preventing the cam 200 from moving in the axial direction of the assembly hole 310, thereby improving the stability of the position of the cam 200. In addition, the force transmission rod 100 is positioned by two bearings 610, and the coaxiality between the force transmission rod 100 and the cam 200 is high, so that the force transmission rod 100 can drive the cam 200 to rotate more labor-saving.

[0055] Please combine Figure 1 and Figure 2 In this embodiment, the structures of the three push rods 400 are optionally arranged to be the same, and each push rod 400 includes a round rod segment 410, a force rod segment 420, and a threaded rod segment 430, which are connected in sequence and arranged coaxially. The round rod segment 410 is slidably matched with the guide hole 320; the calibration plate 500 is screwed and fixed with the threaded rod segment 430; a limiting step surface is formed at the connection between the force rod segment 420 and the threaded rod segment 430, and the limiting step surface is used to abut against the calibration plate 500 to limit the calibration plate 500 from moving toward the force rod segment 420; the force rod segment 420 is used to cooperate with a tool to drive the push rod 400 to rotate in the guide hole 320 through the tool.

[0056] It should be understood that when adjusting the initial position of the calibration plate 500, the calibration plate 500 can be inserted into the pipe fitting 002 or the flange pipe 001, and the edge of the calibration plate 500 contacts the inner wall of the pipe. It is clamped with the force rod segment 420 through a wrench or other tool, and force is applied to the wrench to drive the force rod segment 420 to rotate, thereby making the calibration plate 500 rise or fall, and the position adjustment of the calibration plate 500 is convenient.

[0057] It should be noted that the force-applying rod segment 420 may be a square rod segment, which can be engaged with a wrench to facilitate driving the force-transmitting rod 100 to rotate.

[0058] In this embodiment, the welding positioning device may further include a locking nut 700, which is screwed and fixed to the threaded rod section 430. The locking nut 700 is used to abut against the calibration plate 500 to limit the calibration plate 500 from sliding in a direction away from the cam 200. After the position adjustment of the calibration plate 500 is completed, the locking nut 700 is used to fit above the calibration plate 500 to improve the stability of the position of the calibration plate 500.

[0059] In this embodiment, optionally, the structures of the three calibration plates 500 are set to be the same, each calibration plate 500 is set to be a concave plate, and the two side surfaces of the calibration plate 500 in the width direction are set to be arc surfaces; the bottom wall of the groove of the calibration plate 500 is provided with a threaded hole, and the threaded hole is screwed and fixed with the threaded rod section 430. Both sides of the calibration plate 500 can contact with the inner pipe wall of the pipe fitting 002 and the flange pipe 001, with a large contact area, high support balance, and good positioning effect.

[0060] Furthermore, the length of the threaded rod segment 430 is less than the groove depth of the calibration plate 500, and the groove depth direction of the calibration plate 500 is consistent with the length direction of the threaded rod segment 430. When the height of the calibration plate 500 is adjusted to make it contact with the inner wall of the pipe fitting 002 or the flange pipe 001, the height of the two side edges of the calibration plate 500 is always higher than the end position of the threaded rod segment 430, thus avoiding the situation where the threaded rod segment 430 contacts the inner wall of the pipe and causes interference.

[0061] Please combine Figure 5 Optionally, the fixing member 300 is a circular ring structure, and the hollow area in the middle of the fixing member 300 is the assembly hole 310. The fixing member 300 is provided with three guide holes 320 evenly spaced around the axis of the assembly hole 310. Each guide hole 320 is a cylindrical through hole. The round rod section 410 of the ejector rod 400 is inserted into the guide hole 320. The diameters of the two are substantially the same, so as to prevent the ejector rod 400 from shaking in the radial direction in the guide hole 320. At the same time, a first identification portion is provided on the fixing member 300, and a second identification portion is provided on both the concave surface 220 and the convex surface 210. The first identification portion is used to align with the second identification portion when the convex surface 210 or the concave surface 220 is directly opposite to the guide hole 320.

[0062] It should be noted that when the force transmission rod 100 is rotated to drive the cam 200 to rotate, the first identification part and the second identification part cooperate to intuitively obtain the matching state of the cam 200 and the push rod 400, and the adjustment is convenient and accurate. It should be understood that the types of the identification parts on the convex surface 210 and the concave surface 220 can be set to be different, so that it can be more clearly known whether it is the concave surface 220 or the convex surface 210 that cooperates with the push rod 400, further improving the efficiency of the operation.

[0063] In addition, identification portions may be provided on both sides of the fixing member 300 and the cam 200, and the alignment of the identification portions can be observed from different directions, which is convenient for operation.

[0064] The welding positioning device provided in this embodiment can provide positioning for the flange pipe 001 and the pipe fitting 002 when welding the flange pipe 001 and the pipe fitting 002, ensuring that the positions of the flange pipe 001 and the pipe fitting 002 are accurate and reliable during the welding process, not easily displaced, and improving the welding quality.

[0065] This embodiment also provides a welding process. The welding process is applied to the welding positioning device, and the welding process includes the following steps:

[0066] Please combine Figure 2 and Figure 3 , step s100: Apply force to the rotating rod to drive the cam 200 to rotate, and align the concave surface 220 of the cam 200 with the guide hole 320;

[0067] Step s200: Place the calibration plate 500 in the flange pipe 001 placed on the positioning platform. Apply force to the rotating rod to drive the cam 200 to rotate, and align the convex surface 210 of the cam 200 with the guide hole 320, and make the end of each ejector rod 400 contact the convex surface 210; Adjust the position of each calibration plate 500 to make it contact the inner wall of the flange pipe 001, and then lock the calibration plate 500 on the ejector rod 400;

[0068] Step s300: Apply force to the rotating rod to drive the cam 200 to rotate, and make the convex surface 210 leave the guide hole 320, so that all the calibration plates 500 move closer to the middle;

[0069] Step s400: Sleeve the pipe fitting 002 to be welded outside the plurality of calibration plates 500, and align the end of the pipe fitting 002 with the end of the flange pipe 001; Apply force to the rotating rod to drive the cam 200 to rotate, and make the convex surface 210 abut against the ejector rod 400, so that the calibration plate 500 contacts the inner wall of the flange pipe 001 and the inner wall of the pipe fitting 002 at the same time;

[0070] Step s500: Weld the flange pipe 001 and the pipe fitting 002 by means of symmetric spot welding.

[0071] In this embodiment, optionally, after step s500, remove the welding positioning device and perform full welding on the flange pipe 001 and the pipe fitting 002 in a symmetric manner. After full welding, the fixing firmness of the flange pipe 001 and the pipe fitting 002 can be improved, the safety during use can be improved, and the service life can be extended.

[0072] The welding process provided in this embodiment can improve the welding quality of the flange pipe 001 and the pipe fitting 002.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A welding positioning device for positioning a flange pipe (001) and a pipe fitting (002) to be welded, characterized in that: include: A force transmission rod (100), a cam (200), a fixing member (300), a plurality of push rods (400) and a plurality of calibration plates (500); the force transmission rod (100) is fixedly connected to the cam (200) and the two are coaxially arranged; the cam (200) is provided with a plurality of convex surfaces (210) and a plurality of concave surfaces (220) of equal number, and the plurality of convex surfaces (210) and the plurality of concave surfaces (220) are alternately arranged in sequence in the circumferential direction of the cam (200); the fixing member (300) is provided with an assembly hole (310) and a plurality of guide holes (320) connected to the assembly hole (310); the cam (20 0) is rotatably matched with the assembly hole (310), the plurality of guide holes (320) are arranged at intervals in the circumferential direction of the assembly hole (310), the number of the guide holes (320) is equal to the number of the convex surface (210) or the concave surface (220), the angle between any adjacent convex surfaces (210), the angle between any adjacent concave surfaces (220) and the angle between any adjacent guide holes (320) are all equal; a push rod (400) is slidably installed in each guide hole (320), and the end of the push rod (400) is in contact with the concave surface (220) or the convex surface (210); The plurality of calibration plates (500) are respectively matched with the plurality of push rods (400) in a one-to-one correspondence, and each calibration plate (500) and the corresponding push rod (400) can be locked and adjusted in the length direction of the push rod (400).

2. The welding positioning device according to claim 1, characterized in that: The cam (200) is provided with a fixing hole (230), and the force transmission rod (100) is inserted into the fixing hole (230) and is interference-fitted with the fixing hole (230).

3. The welding positioning device according to claim 2, characterized in that: The welding positioning device also includes two pressure plates (600), each of which is provided with a bearing (610). The two pressure plates (600) are respectively located on both sides of the fixing member (300) and are fixedly connected to the fixing member (300); the force transmission rod (100) is simultaneously passed through the inner rings of the two bearings (610) and is interference fit with the inner rings.

4. The welding positioning device according to claim 1, characterized in that: The push rod (400) includes a round rod segment (410), a force rod segment (420) and a threaded rod segment (430) which are connected in sequence and coaxially arranged, and the round rod segment (410) is slidably matched with the guide hole (320); the calibration plate (500) is screwed and fixed with the threaded rod segment (430); a limiting step surface is formed at the connection between the force rod segment (420) and the threaded rod segment (430), and the limiting step surface is used to abut against the calibration plate (500) to limit the calibration plate (500) from moving toward the force rod segment (420); the force rod segment (420) is used to cooperate with a tool to drive the push rod (400) to rotate in the guide hole (320) through the tool.

5. The welding positioning device according to claim 4, characterized in that: The welding positioning device also includes a locking nut (700) which is threadedly fixed to the threaded rod section (430), and the locking nut (700) is used to abut against the calibration plate (500) to limit the calibration plate (500) from sliding in a direction away from the cam (200).

6. The welding positioning device according to claim 4, characterized in that: The calibration plate (500) is configured as a concave plate, and the two side surfaces of the calibration plate (500) in the width direction are configured as arc-shaped surfaces; a threaded hole is provided on the bottom wall of the groove of the calibration plate (500), and the threaded hole is screwed and fixed to the threaded rod section (430).

7. The welding positioning device according to claim 6, characterized in that: The length of the threaded rod segment (430) is less than the groove depth of the calibration plate (500), and the groove depth direction of the calibration plate (500) is consistent with the length direction of the threaded rod segment (430).

8. The welding positioning device according to claim 1, characterized in that: The fixing member (300) is provided with a first identification portion, and the concave surface (220) and the convex surface (210) are both provided with a second identification portion, and the first identification portion is used to align with the second identification portion when the convex surface (210) or the concave surface (220) is facing the guide hole (320).

9. A welding process, characterized in that: The welding process is applied to the welding positioning device described in any one of claims 1 to 8, and the welding process comprises the following steps: Step s100, applying force to the rotating rod so that it drives the cam (200) to rotate, and aligns the concave surface (220) of the cam (200) with the guide hole (320); Step s200, placing the calibration plate (500) in the flange tube (001) on the positioning platform, applying force to the rotating rod so that it drives the cam (200) to rotate, and aligning the convex surface (210) of the cam (200) with the guide hole (320), and making the end of each push rod (400) contact the convex surface (210); adjusting the position of each calibration plate (500) so that it contacts the inner wall of the flange tube (001), and then locking the calibration plate (500) on the push rod (400); Step s300, applying force to the rotating rod to drive the cam (200) to rotate, and to make the convex surface (210) leave the guide hole (320), so that all the calibration plates (500) move closer to the middle; Step s400, sleeve the welded pipe fitting (002) outside the plurality of calibration plates (500) so that the end of the pipe fitting (002) is aligned with the end of the flange pipe (001); apply force to the rotating rod so that it drives the cam (200) to rotate, and makes the convex surface (210) abut against the push rod (400), so that the calibration plate (500) is in contact with the inner wall of the flange pipe (001) and the inner wall of the pipe fitting (002) at the same time; Step s500: Welding the flange pipe (001) and the pipe fitting (002) by symmetrical spot welding.

10. The welding process according to claim 9, characterized in that: After step s500, the welding positioning device is removed, and the flange pipe (001) and the pipe fitting (002) are fully welded in a symmetrical manner.

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