Welding method for fusion device cooling tube

Abstract

The present application relates to the technical field of nuclear fusion device, disclose a kind of welding method of fusion device cooling pipe, wherein, the welding method of fusion device cooling pipe includes the following steps: preparation two cooling pipes to be welded;Welding adapter on the welding surface of one of the cooling pipes, the nickel content of the adapter is higher than the nickel content of the cooling pipe;The radial interior of adapter and the welding surface to be welded of adapter are polished;Two cooling pipes are matched, so that the welding surface of another cooling pipe is connected with the welding surface to be welded of adapter;Self-fusion welding is carried out on the adapter and another cooling pipe.The welding method of fusion device cooling pipe of the embodiment of the present application not only solves the problem of excessive magnetic permeability of the cooling pipe, but also improves the welding quality and welding qualification rate of the cooling pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear fusion devices, in particular to a welding method of a cooling pipe of a fusion device. BACKGROUND

[0002] In the operation of a tokamak nuclear fusion device, it is necessary to reduce the heat load generated by thermal radiation or thermal conduction on the low-temperature superconducting magnet and low-temperature components, so a special cooling pipe channel is needed to take away the above heat.

[0003] Among them, considering the economic factor, the material of the cooling pipe is mainly 304 stainless steel, the diameter is generally less than 42mm, and the wall thickness is less than 3mm. Due to the small size, long length of the cooling pipe, close distance to the cold screen plate, harsh operating environment and long operating time, the welding quality and magnetic permeability of the cooling pipe are extremely high. After welding, the strength and quality of the weld of the cooling pipe need to be avoided to avoid problems in subsequent long-time operation.

[0004] However, at present, the adjacent two cooling pipes are usually welded by manual argon arc welding. This welding method not only leads to low welding efficiency, poor welding quality, low welding qualification rate and easy deformation of the cooling pipe, but also easily causes the magnetic permeability of the cooling pipe to exceed the standard, affecting the performance of the cooling pipe. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a welding method of a cooling pipe of a fusion device, which can not only avoid the magnetic permeability of the cooling pipe exceeding the standard, but also improve the welding efficiency of the cooling pipe, avoid deformation of the cooling pipe during welding, improve the welding quality and welding qualification rate of the cooling pipe, and solve the technical problems of low welding efficiency, poor welding quality, low welding qualification rate and excessive magnetic permeability of the cooling pipe in the prior art.

[0006] The welding method of the cooling pipe of the fusion device according to the embodiment of the present application comprises the following steps: preparing two cooling pipes to be welded; welding an adapter on the welding surface of one of the cooling pipes, the nickel content of the adapter being higher than that of the cooling pipe; polishing the radial inside of the adapter and the welding surface of the adapter; assembling the two cooling pipes to make the welding surface of the other cooling pipe abut against the welding surface of the adapter; and self-fusion welding the adapter and the other cooling pipe.

[0007] The welding method of the fusion device cooling pipe according to the embodiment of the present application can solve the problem of excessive magnetic permeability of the cooling pipe by welding the adapter on the welding surface of one of the cooling pipes and setting the nickel content of the adapter to be higher than that of the cooling pipe. Meanwhile, polishing the radial inner part of the adapter and the welding surface of the adapter can not only make the radial inner part of the cooling pipe smooth after welding to ensure the working performance of the cooling pipe, but also make the welding surface of the adapter smooth towards the welding surface of the other cooling pipe to facilitate the welding of the adapter and the other cooling pipe. In addition, self-fusion welding of the adapter and the other cooling pipe can not only improve the welding efficiency, but also avoid deformation of the cooling pipe during welding, ensure the straightness of the cooling pipe and improve the welding quality of the cooling pipe, so as to improve the welding qualification rate of the cooling pipe and ensure the working performance of the cooling pipe.

[0008] In some embodiments, before welding the adapter on the welding surface of one of the cooling pipes, the method further comprises cutting the two cooling pipes to be welded to make the welding surfaces of the cooling pipes perpendicular to the axes of the cooling pipes and form a uniform predetermined gap between the welding surfaces of the two cooling pipes.

[0009] In some embodiments, the parallelism deviation of the welding surfaces of the two cooling pipes is less than 0.1 mm.

[0010] In some embodiments, the cooling pipe is a 304 stainless steel piece; and / or the adapter is a 316 stainless steel piece.

[0011] In some embodiments, before polishing the radial inner part of the adapter and the welding surface of the adapter, the method further comprises inserting a plug into the inside of the cooling pipe on which the adapter is welded, the plug being in sealing connection with the cooling pipe and being spaced apart from the adapter.

[0012] In some embodiments, after polishing the adapter, the extension length of the adapter in the axial direction is not less than 1 mm.

[0013] In some embodiments, after cutting the two cooling pipes to be welded, the method further comprises judging whether the wall thickness of the cooling pipe is greater than 2 mm; if yes, machining a bevel on the end of the cooling pipe to form a root face on the welding surface of the cooling pipe, and welding the adapter on the root face of one of the cooling pipes; if not, directly welding the adapter on the welding surface of one of the cooling pipes.

[0014] In some embodiments, the inclination angle of the bevel is 30°-35°; and / or in the radial direction of the cooling pipe, the width of the root face is 1 mm-1.5 mm.

[0015] In some embodiments, when the bevel is machined at the end of the cooling pipe, it further comprises: filling wire welding at the bevel for two cooling pipes.

[0016] In some embodiments, when the adapter and another cooling pipe are self-fusion welded, it comprises: dividing the welding surface of another cooling pipe into twelve areas arranged in sequence along the circumference; preheating the cooling pipe using a current of 90A for 8s; setting the welding starting point at the nine o'clock position of the welding surface; and welding the adapter and another cooling pipe in a counterclockwise direction.

[0017] In some embodiments, when the adapter and another cooling pipe are welded in a counterclockwise direction, it further comprises: reducing the welding current by 1A after each area is welded.

[0018] In some embodiments, a protective gas is added when the adapter and another cooling pipe are self-fusion welded, and the protective gas is 98% Ar + 2% N2.

[0019] In some embodiments, after the adapter and another cooling pipe are welded, it further comprises: detecting the welding position.

[0020] The welding device for the cooling pipe of the fusion device according to the embodiment of the present application comprises: a first welding module for welding one of the cooling pipes and the adapter; a polishing module for polishing the radial interior of the adapter and the welding surface of the adapter; a grouping module for grouping two cooling pipes; and a second welding module for welding the adapter and another cooling pipe.

[0021] The welding device for the cooling pipe of the fusion device according to the embodiment of the present application can improve the welding efficiency and the welding quality, ensure that the welding quality is qualified at one time, and thus guarantee the working performance of the cooling pipe.

[0022] In some embodiments, the polishing module comprises: a first polishing module, the first polishing module comprises a first polishing piece and a first driving piece, the first polishing piece has the same outer diameter as the inner diameter of the cooling pipe, the first polishing piece is adapted to be arranged radially inside the adapter, and the first driving piece is used to drive the first polishing piece to rotate to polish the radially inside of the adapter; a second polishing module, the second polishing module comprises a second polishing piece, a polishing sleeve and a second driving piece, the polishing sleeve is adapted to be sleeved on the outer periphery of the adapter, and the adapter is formed with an end of a welding surface exposed from the polishing sleeve, an end surface of the second polishing piece is formed as a plane, in the axial direction of the adapter, the plane of the second polishing piece is arranged opposite to the welding surface of the adapter, and the second driving piece is used to drive the second polishing piece to move towards the adapter, when the plane contacts the adapter, the second polishing piece can polish the welding surface of the adapter.

[0023] Additional aspects and advantages of the present application will become apparent from the following description, which is provided for the purpose of illustration and explanation. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0025] Figure 1 Flow chart of the welding method of the cooling pipe of the fusion device for some embodiments of the present application;

[0026] Figure 2 Flow chart of the welding method of the cooling pipe of the fusion device for some embodiments of the present application;

[0027] Figure 3 Schematic diagram of the two cooling pipes after welding for some embodiments of the present application;

[0028] Figure 4 Schematic diagram of the machining groove of the cooling pipe for some embodiments of the present application;

[0029] Figure 5 Side view of the cooling pipe for some embodiments of the present application;

[0030] Figure 6 Schematic diagram of the first polishing piece for some embodiments of the present application;

[0031] Figure 7 Schematic diagram of the adapter, the cooling pipe and the polishing sleeve for some embodiments of the present application.

[0032] REFERENCE NUMERALS:

[0033] 100, polishing module;

[0034] 110, first polishing module; 111, first polishing piece; 112, clamping piece;

[0035] 120, second polishing module; 121, polishing sleeve; 122, second polishing piece;

[0036] 1100, cooling pipe; 1110, bevel; 1120, root face; 200, area; 300, welding starting point;

[0037] 1200, adapter. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar elements or elements having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present application, and cannot be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] A welding method for a fusion device cooling pipe is described below with reference to the accompanying drawings.

[0041] As shown in Figure 1 A welding method for a fusion device cooling pipe according to an embodiment of the present application includes the following steps:

[0042] S1, preparing two cooling pipes 1100 to be welded (the structure of the cooling pipe 1100 can be seen from Figure 3 ).

[0043] In the above steps, two cooling pipes 1100 to be welded are provided to facilitate subsequent welding of the cooling pipe 1100.

[0044] S2, welding an adapter 1200 on the welding surface of one of the cooling pipes 1100, the nickel content of the adapter 1200 being higher than that of the cooling pipe 1100.

[0045] In the above step, the adapter 1200 is welded on the welding surface of one of the cooling pipes 1100, which can reduce the welding difficulty of the two cooling pipes 1100 to be welded, and by setting the nickel content of the adapter 1200 to be higher than that of the cooling pipe 1100, the problem of excessive magnetic permeability of the cooling pipe 1100 after welding can be solved, and the influence of the cooling pipe 1100 on the superconducting magnet can be avoided.

[0046] It should be noted that when the two cooling pipes 1100 to be welded are arranged opposite to each other along the left-right direction (as shown in Figure 3 It should be noted that when the two cooling pipes 1100 to be welded are arranged opposite to each other along the left-right direction (as shown in

[0047] In a specific example, the adapter 1200 is welded on the welding surface of the cooling pipe 1100 on the left side, and since the worker usually holds the welding gun with the right hand to weld the cooling pipe 1100 and the adapter 1200, welding the adapter 1200 on the welding surface of the cooling pipe 1100 on the left side can reduce the welding difficulty of one of the cooling pipe 1100 and the adapter 1200, and improve the welding efficiency and the welding quality.

[0048] In some embodiments, the cooling pipe 1100 and the adapter 1200 are welded by argon arc welding.

[0049] It should be further noted that the cooling pipe 1100 in the prior art is usually made of 304 stainless steel, which belongs to austenitic stainless steel, that is, chromium-nickel austenitic stainless steel. In the 304 stainless steel, the nickel content is 8.0%~10.5%. Since the cooling pipe 1100 made of 304 stainless steel is unstable in austenitic structure due to the influence of welding thermal cycle during welding, the problem of excessive magnetic permeability in the weld area of the cooling pipe 1100 is prone to occur. Based on this, the adapter 1200 is provided, and the nickel content of the adapter 1200 is set to be higher than that of the cooling pipe 1100, which can enhance the stability of austenite to inhibit the generation of ferromagnetic phase, thereby reducing the magnetic permeability so that the magnetic permeability of the cooling pipe 1100 meets the standard.

[0050] S3, polishing the radial inner part of the adapter 1200 and the welding surface of the adapter 1200.

[0051] In the above step, the welding surface of the adapter 1200 is polished to make the welding surface of the adapter 1200 smooth and flat towards the welding surface of the other cooling pipe 1100, so that the welding surface of the adapter 1200 can be better matched with the welding surface of the other cooling pipe 1100, and the two cooling pipes 1100 can be closely matched during the matching, thereby reducing the matching difficulty of the two cooling pipes 1100 and facilitating the subsequent welding work.

[0052] At the same time, the radial inner part of the adapter 1200 is polished to avoid the existence of unevenness in the radial inner part of the adapter 1200, so that the surface of the radial inner part of the adapter 1200 is smooth and flat, so that the cooling pipe 1100 is welded to be smooth and flat inside, and the working performance of the cooling pipe 1100 is guaranteed.

[0053] In summary, by polishing the radial inner part of the adapter 1200 and the welding surface of the adapter 1200, the flatness of the welding surface of the adapter 1200 is guaranteed, and the cooling pipe 1100 is welded to be smooth and flat inside.

[0054] S4, the two cooling pipes 1100 are matched to make the welding surface of the other cooling pipe 1100 abut the welding surface of the adapter 1200.

[0055] In the above step, the welding surface of the other cooling pipe 1100 and the welding surface of the adapter 1200 can be preliminarily installed and matched, and the accuracy of the subsequent welding position is improved.

[0056] S5, the adapter 1200 and the other cooling pipe 1100 are welded by self-fluxing welding.

[0057] In the above step, the welding of the two cooling pipes 1100 can be realized, and the adapter 1200 is arranged between the two cooling pipes 1100.

[0058] It is worth noting that the adapter 1200 and the other cooling pipe 1100 of the present application are welded by self-fluxing welding, which can not only avoid the deformation of the cooling pipe 1100 during welding, guarantee the straightness of the cooling pipe 1100, but also improve the welding quality and efficiency of the cooling pipe 1100, and improve the welding qualification rate of the cooling pipe 1100, thereby guaranteeing the working performance of the cooling pipe 1100.

[0059] In a specific example, the tungsten needle of the self-fluxing welding machine rotates in the machine head to melt the base metal of the adapter 1200 and the other cooling pipe 1100, thereby realizing the self-fluxing welding of the adapter 1200 and the other cooling pipe 1100.

[0060] It should be noted that, since the cooling pipe 1100 is close to the cold screen plate, the welding operation space and the line of sight are limited, the welding difficulty is extremely great, the welding position of the cooling pipe 1100 is prone to porosity, and then the root of the welding position of the cooling pipe 1100 is prone to defects such as poor forming and root oxidation. The self-fusion welding is adopted in the application, the porosity of the welding position of the cooling pipe 1100 and the adapter 1200 can be avoided, the good forming of the root of the welding position of the cooling pipe 1100 is ensured, the structural strength of the cooling pipe 1100 is ensured, the rework of the cutting opening is avoided, and then the stable connection of the cooling pipe 1100 and the adapter 1200 is ensured, so that the reliability of the connection of the two cooling pipes 1100 is ensured, and the welding qualification rate of the cooling pipe 1100 is improved.

[0061] From the above structure, it can be known that the welding method of the fusion device cooling pipe of the embodiment of the application can solve the problem of excessive magnetic permeability of the cooling pipe 1100 by welding the adapter 1200 on the welding surface of one of the cooling pipes 1100, and setting the nickel content of the adapter 1200 to be higher than the nickel content of the cooling pipe 1100, and then avoiding affecting the superconducting magnet.

[0062] At the same time, by polishing the radial inner part of the adapter 1200 and the welding surface of the adapter 1200, the welding surface of the adapter 1200 towards the other cooling pipe 1100 is smooth and smooth, so that the adapter 1200 can be better connected with the welding surface of the other cooling pipe 1100, and then the difficulty of assembling the two cooling pipes 1100 is reduced, so that the subsequent welding work is facilitated.

[0063] In addition, the self-fusion welding of the adapter 1200 and the other cooling pipe 1100 can avoid deformation of the cooling pipe 1100 during welding, ensure the straightness of the cooling pipe 1100, and improve the welding quality and efficiency of the cooling pipe 1100, so as to improve the welding qualification rate of the cooling pipe 1100.

[0064] It can be understood that, compared with the prior art, the application not only prevents the magnetic permeability of the cooling pipe 1100 from being excessive, but also avoids deformation of the cooling pipe 1100 during welding, so as to improve the welding quality of the cooling pipe 1100 and improve the welding qualification rate and efficiency of the cooling pipe 1100.

[0065] It should be noted that, in the application, the material of the cooling pipe 1100 is mainly 304 stainless steel, the diameter is generally less than 42mm, and the wall thickness is less than 3mm. In order to increase the cooling area of the cooling pipe 1100, the cooling pipe 1100 is usually arranged in a reciprocating coil on the cold screen plate and connected between adjacent cooling pipes 1100 by welding.

[0066] In some embodiments, the combination Figure 1 and Figure 2 Before welding the adapter 1200 to the welding surface of one of the cooling pipes 1100, the method further comprises cutting the two cooling pipes 1100 to be welded so that the welding surfaces of the cooling pipes 1100 are perpendicular to the axes of the cooling pipes 1100 and a uniform predetermined gap is formed between the welding surfaces of the two cooling pipes 1100. On the one hand, the welding quality and performance of the two cooling pipes 1100 can be ensured, and on the other hand, the welding process is simplified and the welding efficiency is improved by avoiding frequent adjustment of parameters due to the distance between the welding surfaces of the two cooling pipes 1100 being large or small.

[0067] In some embodiments, the parallelism deviation of the welding surfaces of the two cooling pipes 1100 is less than 0.1 mm. Thus, a uniform predetermined gap can be formed between the welding surfaces of the two cooling pipes 1100, the welding quality and performance of the two cooling pipes 1100 can be ensured, and the welding difficulty is reduced.

[0068] In some embodiments, the cooling pipe 1100 is a 304 stainless steel piece. That is, the cooling pipe 1100 is made of 304 stainless steel. Since 304 stainless steel has excellent corrosion resistance, mechanical properties, processability, safety and other characteristics, the working performance of the cooling pipe 1100 can be significantly improved, and the use cost of the cooling pipe 1100 can be reduced.

[0069] In some embodiments, the adapter 1200 is a 316 stainless steel piece. That is, the adapter 1200 is made of 316 stainless steel, so that the nickel content of the adapter 1200 is higher than that of the cooling pipe 1100, which can enhance the stability of austenite and avoid the magnetic permeability of the cooling pipe 1100 exceeding the standard.

[0070] It should be noted that 316 stainless steel is a high-performance austenitic stainless steel, and the nickel content in 316 stainless steel is 10.0% to 14.0%, so that the nickel content of the adapter 1200 is higher than that of the cooling pipe 1100.

[0071] It should be further noted that 316 stainless steel also adds molybdenum element compared to 304 stainless steel, because molybdenum has the ability to resist pitting and crevice corrosion, so that the adapter 1200 has the ability to significantly resist pitting and crevice corrosion, thereby ensuring the stability of the welding position of the two cooling pipes 1100.

[0072] In some embodiments, the adapter 1200 is formed as an ER316L welding wire, which is a commonly used stainless steel welding material, belonging to a low-alloy austenitic stainless steel welding wire. Among them, E represents Electrode (electrode), which means that it is a "welding material", that is, a filler metal, in the welding wire code; R represents Rod (rod wire), which indicates that it is in the form of a disc or a straight bar solid welding wire; 316 refers to the model of stainless steel, which means that the metal chemical composition of the welding wire matches the 316 stainless steel; L represents Low Carbon (low carbon), which means that compared with the standard 316 welding wire, it has lower carbon content.

[0073] In summary, the adapter 1200 of the present application is a welding wire with a chemical composition matching the low-carbon 316 stainless steel.

[0074] In a specific example, after cutting the two cooling pipes 1100 to be welded, a welding wire with a diameter φ of 1.0 mm and a model of ER316L is welded on the welding surface of one of the cooling pipes 1100 by manual argon arc welding, to form the adapter 1200.

[0075] In some embodiments, before polishing the radial interior of the adapter 1200 and the welding surface of the adapter 1200, a plug is inserted into the interior of the cooling pipe 1100 to which the adapter 1200 is welded, and the plug is sealingly connected to the cooling pipe 1100 and is spaced apart from the adapter 1200. To prevent debris generated during polishing of the radial interior of the adapter 1200 and the welding surface of the adapter 1200 from entering the cooling pipe 1100, thereby avoiding clogging of the cooling pipe 1100 and ensuring smooth transportation of the cooling liquid by the cooling pipe 1100, and improving the working performance of the cooling pipe 1100.

[0076] At the same time, by spacing the plug apart from the adapter 1200, interference between the plug and the adapter 1200 can be avoided, and the polishing of the radial interior of the adapter 1200 and the welding surface of the adapter 1200 can be avoided.

[0077] In a specific example, before polishing the radial interior of the adapter 1200 and the welding surface of the adapter 1200, a temporary plug is inserted about 20 mm away from the adapter 1200, and after polishing the radial interior of the adapter 1200 and the welding surface of the adapter 1200, the polishing debris is cleaned and the temporary plug is removed, to avoid clogging of the cooling pipe 1100.

[0078] In some embodiments, after the adapter 1200 is polished, the extension length of the adapter 1200 in the axial direction thereof is not less than 1 mm. In this way, the adapter 1200 itself has a certain extension length, so as to facilitate the self-welding of the adapter 1200 and another cooling pipe 1100, and reduce the welding difficulty of the adapter 1200 and another cooling pipe 1100.

[0079] Optionally, after the two cooling pipes 1100 to be welded are cut, about 2 mm thick welding wire can be welded on the welding surface of one of the cooling pipes 1100 by means of manual argon arc welding, so that, after the adapter 1200 is polished, the extension length of the adapter 1200 in the axial direction thereof is not less than 1 mm.

[0080] In some embodiments, as shown in Figure 1 and Figure 2 After the two cooling pipes 1100 to be welded are cut, the method further includes: judging whether the wall thickness of the cooling pipe 1100 is greater than 2 mm; if yes, a bevel 1110 is processed at the end of the cooling pipe 1100, so that the welding surface of the cooling pipe 1100 is formed with a root face 1120 (for specific illustrations of the bevel 1110 and the root face 1120, please refer to Figure 4 ), and the adapter 1200 is welded on the root face 1120 of one of the cooling pipes 1100; if not, the adapter 1200 is directly welded on the welding surface of one of the cooling pipes 1100.

[0081] It should be noted that, when the wall thickness of the cooling pipe 1100 is greater than 2 mm, if the adapter 1200 is directly welded on the welding surface of one of the cooling pipes 1100, defects such as incomplete penetration, root depression and incomplete welding of the welding surface are likely to occur, which affects the welding effect and reduces the welding quality. Therefore, after the two cooling pipes 1100 to be welded are cut, the wall thickness of the cooling pipe 1100 needs to be judged, when the wall thickness of the cooling pipe 1100 is less than 2 mm, the adapter 1200 can be directly welded on the welding surface of one of the cooling pipes 1100, and the welding effect of one of the cooling pipes 1100 and the adapter 1200 is ensured; when the wall thickness of the cooling pipe 1100 is greater than 2 mm, a bevel 1110 is first processed at the end of the cooling pipe 1100, so that the welding surface of the cooling pipe 1100 is formed with a root face 1120, and the adapter 1200 is welded on the root face 1120 of one of the cooling pipes 1100. In this way, the two cooling pipes 1100 can be welded through the adapter 1200, and the welding quality of the two cooling pipes 1100 can be improved, and problems such as incomplete penetration, root depression and incomplete welding of the welding surface can be avoided.

[0082] In some embodiments, as shown in Figure 4As shown, the inclination angle of bevel 1110 is 30°~35°. It should be noted that the inclination angle of bevel 1110 can be understood as... Figure 4 As shown in the figure, when α is too small, it is not conducive to the welding of cooling pipe 1100 and adapter 1200, resulting in high welding difficulty and poor welding quality. When α is too large, the heating time will be long when welding the two bevels 1110, which will cause the welding heat to affect other areas on cooling pipe 1100, thus affecting the welding quality of the two cooling pipes 1100 and making it difficult to ensure the mechanical properties of the cooling pipe 1100 structure, resulting in poor structural strength of cooling pipe 1100.

[0083] In summary, this application sets the inclination angle of the bevel 1110 to 30°~35°, which can reduce the welding difficulty of the cooling pipe 1100 and the adapter 1200, reduce the heating time when welding the two bevels 1110, improve the welding quality of the two cooling pipes 1100, help ensure the mechanical properties of the cooling pipe 1100 structure, and enhance the structural strength of the cooling pipe 1100.

[0084] Specifically, the inclination angle of bevel 1110 is 30°, 31°, 32°, 33°, 34° or 35°, etc.

[0085] In some embodiments, such as Figure 4 As shown, the width of the blunt edge 1120 in the radial direction of the cooling pipe 1100 is 1mm to 1.5mm. It should be noted that the width of the blunt edge 1120 can be understood as... Figure 4 The L shown is the distance between the bevel 1110 and the inner wall of the cooling pipe 1100. When L is too small, the cooling pipe 1100 is easily punctured when the adapter 1200 is welded to the cooling pipe 1100, resulting in poor welding quality between the adapter 1200 and the cooling pipe 1100. When L is too large, the self-fusion welding effect between the adapter 1200 and the cooling pipe 1100 will be poor.

[0086] In summary, this application sets the width of the blunt edge 1120 to 1mm~1.5mm, which not only avoids the cooling pipe 1100 being punctured when the adapter 1200 is welded to the cooling pipe 1100, but also ensures the self-fusion welding effect of the adapter 1200 and the cooling pipe 1100.

[0087] Specifically, the width of the blunt edge 1120 is 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc.

[0088] In some embodiments, the end of the cooling pipe 1100 is processed with the bevel 1110, and the two cooling pipes 1100 are filled with wire at the bevel 1110. The gap between the bevels 1110 of the two cooling pipes 1100 is filled, the connection strength between the two cooling pipes 1100 is enhanced, the stability of the welding of the two cooling pipes 1100 is ensured, and the welding quality and sealing of the two cooling pipes 1100 are improved.

[0089] In summary, for the cooling pipe 1100 with a relatively large wall thickness (greater than 2 mm), the end of the cooling pipe 1100 is processed with the bevel 1110, so that the welding surface of the cooling pipe 1100 is formed with the root face 1120, the adapter 1200 is welded on the root face 1120 of one of the cooling pipes 1100, and the two cooling pipes 1100 are filled with wire at the bevel 1110. The problem of thick wall of the cooling pipe 1100 being difficult to use self-fusion welding is solved.

[0090] In some embodiments, the two cooling pipes 1100 are filled with wire at the bevel 1110.

[0091] In some embodiments, as shown in Figure 5 When the adapter 1200 and the other cooling pipe 1100 are self-fusion welded, the welding surface of the other cooling pipe 1100 is divided into twelve areas 200 arranged in sequence along the circumference, the cooling pipe 1100 is preheated using a current of 90A for 8s, the starting point 300 of welding is set at the nine o'clock position of the welding surface, and the adapter 1200 and the other cooling pipe 1100 are welded in the counterclockwise direction. By the above steps, the self-fusion welding of the adapter 1200 and the other cooling pipe 1100 can ensure the welding effect.

[0092] It is worth noting that when the adapter 1200 and the other cooling pipe 1100 are self-fusion welded, the welding surface of the other cooling pipe 1100 is first divided into twelve areas 200 arranged in sequence along the circumference, which can avoid the length of each area 200 being too long, facilitate the partitioning of the welding of the other cooling pipe 1100 and the adapter 1200, and be conducive to ensuring the welding quality of the other cooling pipe 1100 and the adapter 1200.

[0093] At the same time, the cooling pipe 1100 is preheated using a current of 90A for 8s, which facilitates the preheating of the cooling pipe 1100 to a specific temperature, improves the heat cycle conditions of the welding process, reduces the welding defects of the adapter 1200 and the other cooling pipe 1100, and ensures the welding quality and reliability of the welding structure of the adapter 1200 and the other cooling pipe 1100.

[0094] Next, the welding starting point 300 is set at the nine o'clock position of the welding surface, so that the adapter 1200 and the other cooling pipe 1100 can be transversely welded at the welding starting point 300, which is easy to observe and operate, reduces the welding difficulty, and is also beneficial to gas protection and slag removal.

[0095] In addition, the heat input of the transverse welding is small, and the welding needle can also be flush, so as to facilitate the welding of the adapter 1200 and the other cooling pipe 1100.

[0096] Finally, the adapter 1200 and the other cooling pipe 1100 are welded in the counterclockwise direction. Since the welding starting point 300 is set at the nine o'clock position of the welding surface, by welding the adapter 1200 and the other cooling pipe 1100 in the counterclockwise direction, the molten metal flow direction formed by the welding needle and the welding heat in the initial welding stage (from the nine o'clock position to the six o'clock position) is consistent, thereby facilitating the welding of the adapter 1200 and the other cooling pipe 1100 by heat conduction and ensuring the welding quality.

[0097] It should be noted that the welding method described above can enable the cooling pipe 1100 to be welded under complex conditions at the installation site, and the welding qualification rate is guaranteed. Compared with manual argon arc welding, the welding efficiency is improved by at least 50%.

[0098] In some embodiments, in combination with Figure 1 and Figure 2 As shown, when the adapter 1200 and the other cooling pipe 1100 are welded in the counterclockwise direction, the welding current is reduced by 1A for each welding area 200. Through the above setting, the heat input can be effectively reduced, thereby reducing the temperature, volume and fluidity of the molten pool to obtain better control of the molten pool, ultimately guarantee the quality of the weld formation, and avoid various defects.

[0099] In some embodiments, in combination with Figure 1 and Figure 2 As shown, when the adapter 1200 and the other cooling pipe 1100 are welded by self-melting welding, a protective gas is added, and the protective gas is 98% Ar + 2% N2. By adding the protective gas, the molten pool and the heat-affected zone can be prevented from being oxidized and the molten pool can be prevented from being nitrided, and the cleanliness and performance of the weld can be guaranteed, thereby guaranteeing the welding effect of the adapter 1200 and the other cooling pipe 1100.

[0100] At the same time, by setting the protective gas as 98% Ar + 2% N2, the protective gas can isolate air (oxygen, water vapor, etc.), prevent the stainless steel from being oxidized at high temperature, and thereby maintain the surface quality and performance of the stainless steel; at the same time, nitrogen can also avoid the loss of chemical elements of the base material of the cooling pipe 1100 and the adapter 1200, thereby preventing the magnetic permeability of the cooling pipe 1100 from exceeding the standard.

[0101] Meanwhile, the application not only sets the nickel content of the adapter 1200 to be greater than the nickel content of the cooling tube 1100 to prevent the magnetic permeability of the cooling tube 1100 from exceeding the standard, but also sets the protective gas to have 2% N2, further preventing the magnetic permeability of the cooling tube 1100 from exceeding the standard.

[0102] In some embodiments, the adapter 1200 and the other cooling tube 1100 are welded, and the welding position is detected. Figure 1 and Figure 2 As shown in the figure, after the adapter 1200 and the other cooling tube 1100 are welded, the welding position is detected. In this way, the welding defects (such as incomplete penetration, pores, cracks, and slag inclusion) of the cooling tube 1100 and the adapter 1200 can be found, the leakage of the cooling liquid in the cooling tube 1100 can be prevented, and the safety hazard can be avoided to a certain extent, thereby ensuring the safe operation of the cooling tube 1100.

[0103] In a specific example, after the adapter 1200 and the other cooling tube 1100 are welded, the welding position is sequentially subjected to visual inspection, PT (Penetrant Testing) and RT (Radiographic Testing) nondestructive testing, thereby ensuring the welding qualification rate.

[0104] The welding device for the fusion device cooling tube according to the embodiments of the application is described below with reference to the accompanying drawings.

[0105] The welding device for the fusion device cooling tube according to the embodiments of the application comprises a first welding module, a polishing module 100 (the specific structure of the polishing module 100 can be seen from Figure 6 and Figure 7 ), a matching module, and a second welding module.

[0106] The first welding module is used to weld one of the cooling tubes 1100 and the adapter 1200. In this way, the welding difficulty of one of the cooling tubes 1100 and the adapter 1200 is reduced, and the welding reliability of one of the cooling tubes 1100 and the adapter 1200 is improved.

[0107] The polishing module 100 is used to polish the radial inner part of the adapter 1200 and the welding surface of the adapter 1200. In this way, the internal part of the cooling tube 1100 after welding is smooth and flat, and the welding surface of the adapter 1200 towards the other cooling tube 1100 is also smooth and flat, so that the welding surface of the adapter 1200 can be better matched with the welding surface of the other cooling tube 1100.

[0108] It should be noted that the grinding module 100 is used to grind the radial inner part of the adapter 1200 and the welding surface of the adapter 1200, so that the adapter 1200 can be automatically ground, which can not only reduce the grinding difficulty of the adapter 1200, but also ensure the grinding quality of the adapter 1200, so as to ensure that the extension length of the adapter 1200 in the axial direction is not less than 1 mm after the adapter 1200 is ground, so as to ensure the working performance of the adapter 1200.

[0109] The group pairing module is used to group and pair two cooling pipes 1100. The group pairing difficulty of the two cooling pipes 1100 is reduced, and the two cooling pipes 1100 can be relatively arranged, so as to facilitate the welding of the two cooling pipes 1100 and reduce the welding difficulty.

[0110] It should be noted that when the two cooling pipes 1100 are grouped and paired, the two cooling pipes 1100 can be clamped by the self-fusion welding machine.

[0111] The second welding module is used to weld the adapter 1200 and another cooling pipe 1100. Thus, the welding cooperation of the two cooling pipes 1100 is realized, the welding difficulty of the adapter 1200 and another cooling pipe 1100 is reduced, the welding quality of the adapter 1200 and another cooling pipe 1100 is improved, and the welding quality of the two cooling pipes 1100 is improved.

[0112] From the above structure, it can be seen that the welding device for the fusion device cooling pipe of the embodiment of the present application can improve the welding efficiency and welding quality of the two cooling pipes 1100, ensure that the welding quality is qualified at one time, and thus ensure the working performance of the cooling pipe 1100.

[0113] In some embodiments, in combination with Figure 6 and Figure 7 As shown in the drawings, the grinding module 100 includes a first grinding module 110 and a second grinding module 120. The first grinding module 110 includes a first grinding piece 111 and a first driving piece (not shown in the figure). The outer diameter of the first grinding piece 111 is the same as the inner diameter of the cooling pipe 1100. The first grinding piece 111 is adapted to be arranged in the radial inner part of the adapter 1200. The first driving piece is used to drive the first grinding piece 111 to rotate to grind the radial inner part of the adapter 1200. Thus, the first grinding piece 111 is used to trim the radial inner part of the adapter 1200. Since the outer diameter of the first grinding piece 111 is the same as the inner diameter of the cooling pipe 1100, the inner diameter of the adapter 1200 can be equal to the inner diameter of the cooling pipe 1100, so as to ensure that the internal surface of the cooling pipe 1100 is smooth and flat after welding.

[0114] Meanwhile, by arranging the first driving member, power can be provided for the first polishing member 111, so as to reduce the difficulty of polishing the radial inner part of the adapter 1200 by the first polishing member 111 and improve the polishing efficiency.

[0115] In the description of the present application, the features defined as "first" and "second" can explicitly or implicitly include one or more features for distinguishing the described features, without any order or importance.

[0116] In some embodiments, as shown in Figure 6 The first polishing module 110 further comprises a clamping member 112 connected to the first polishing member 111, and the first driving member is connected to the clamping member 112, so as to connect the first driving member to the first polishing member 111, reduce the connection difficulty of the first driving member and the first polishing member 111, and facilitate the rotation of the first polishing member 111 driven by the first driving member to polish the radial inner part of the adapter 1200.

[0117] In some embodiments, the staff can hold the first driving member to polish the radial inner part of the adapter 1200 by the first polishing member 111.

[0118] In some embodiments, as shown in Figure 7 The second polishing module 120 comprises a second polishing member 122, a polishing sleeve 121 and a second driving member (not shown in the figure), the polishing sleeve 121 is adapted to be sleeved on the outer periphery of the adapter 1200, and the end of the adapter 1200 forming the welding surface is exposed from the polishing sleeve 121, the end surface of the second polishing member 122 is formed as a plane, in the axial direction of the adapter 1200, the plane of the second polishing member 122 is arranged opposite to the welding surface of the adapter 1200, and the second driving member is used to drive the second polishing member 122 to move towards the adapter 1200, so that the second polishing member 122 can polish the welding surface of the adapter 1200 when the plane is in contact with the adapter 1200. It can play a role in trimming the welding surface of the adapter 1200, and improve the flatness of the welding surface of the adapter 1200, so as to facilitate the welding of the welding surface of the adapter 1200 and another cooling pipe 1100.

[0119] Meanwhile, the polishing sleeve 121 can not only limit the movement distance of the second polishing member 122, but also fix the adapter 1200, so as to ensure the stability of the second polishing member 122 when polishing the adapter 1200, so as to ensure the polishing effect.

[0120] In addition, by arranging the second driving member, power can be provided for the second polishing member 122, and the polishing difficulty of the welding surface of the adapter 1200 can be reduced, and the polishing efficiency can be improved.

[0121] In some embodiments, the second driving member can be held by the worker to polish the radial inner part of the adapter 1200 by the second polishing member 122.

[0122] Optionally, the first driving member and the second driving member are both rotary motors.

[0123] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0124] Other configurations of the welding method of the fusion device cooling tube according to the embodiments of the present application, such as the specific structure of the first driving member and the second driving member, are known to those skilled in the art, and will not be described in detail here.

[0125] In the description of the present application, the description referring to the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0126] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A welding method for a cooling tube of a fusion device, characterized in that, The welding method for the fusion device cooling tube is based on a welding device for fusion device cooling tubes. The welding device includes a first welding module, a grinding module (100), an assembly module, and a second welding module. The welding method includes the following steps: Prepare two cooling pipes (1100) to be welded. Using the first welding module, an adapter (1200) is welded to the welding surface of one of the cooling pipes (1100), the adapter (1200) having a higher nickel content than the cooling pipe (1100); A plug is inserted inside the cooling pipe (1100) of the welding adapter (1200), the plug being sealed to the cooling pipe (1100) and spaced apart from the adapter (1200); The grinding module (100) is used to grind the radial interior of the adapter (1200) and the surface of the adapter (1200) to be welded. The two cooling pipes (1100) are assembled using the assembly module so that the welding surface of the other cooling pipe (1100) is aligned with the welding surface of the adapter (1200). The welding surface of the other cooling pipe (1100) is divided into twelve regions (200) arranged sequentially along its circumference; the cooling pipe (1100) is preheated by running a current of 90A for 8 seconds; the welding start point (300) is set at the nine o'clock position on the welding surface; the adapter (1200) and the other cooling pipe (1100) are welded in a counterclockwise direction using the second welding module. After each region (200) is welded, the welding current is reduced by 1A to achieve self-fusion welding of the adapter (1200) and the other cooling pipe (1100) using the second welding module. The polishing module (100) includes a first polishing module (110) and a second polishing module (120). The first polishing module (110) includes a first polishing component (111) and a first driving component. The outer diameter of the first polishing component (111) is the same as the inner diameter of the cooling pipe (1100). The first polishing component (111) is adapted to be disposed in the radial interior of the adapter (1200). The first driving component is used to drive the first polishing component (111) to rotate to polish the radial interior of the adapter (1200). The second polishing module (120) includes a second polishing component (122), a polishing sleeve (121), and a second driving component. The sleeve (121) is adapted to be fitted around the outer periphery of the adapter (1200) and the end of the adapter (1200) with the surface to be welded is exposed from the grinding sleeve (121). The end face of the second grinding member (122) is formed as a plane. In the axial direction of the adapter (1200), the plane of the second grinding member (122) is arranged opposite to the surface to be welded of the adapter (1200). The second driving member is used to drive the second grinding member (122) to move toward the adapter (1200). When the plane contacts the adapter (1200), the second grinding member (122) can grind the surface to be welded of the adapter (1200).

2. The welding method for the cooling tube of the fusion device according to claim 1, characterized in that, Before welding the adapter (1200) to the welding surface of one of the cooling pipes (1100), the following is also included: The two cooling tubes (1100) to be welded are cut so that the welding surface of the cooling tube (1100) is perpendicular to the axis of the cooling tube (1100) and a uniform predetermined gap is formed between the welding surfaces of the two cooling tubes (1100).

3. The welding method for the cooling tube of the fusion device according to claim 2, characterized in that, The parallelism deviation of the welding surfaces of the two cooling pipes (1100) is less than 0.1 mm.

4. The welding method for the cooling tube of the fusion device according to claim 1, characterized in that, The cooling pipe (1100) is made of 304 stainless steel; and / or the adapter (1200) is made of 316 stainless steel.

5. The welding method for the cooling tube of the fusion device according to claim 1, characterized in that, After the adapter (1200) is polished, the axial extension length of the adapter (1200) is not less than 1 mm.

6. The welding method for the cooling tube of the fusion device according to claim 2, characterized in that, After cutting the two cooling pipes (1100) to be welded, the process also includes: Determine whether the wall thickness of the cooling pipe (1100) is greater than 2mm; If so, a bevel (1110) is machined at the end of the cooling pipe (1100) so that the welding surface of the cooling pipe (1100) forms a blunt edge (1120), and the adapter (1200) is welded on the blunt edge (1120) of one of the cooling pipes (1100). If not, the adapter (1200) is welded directly onto the welding surface of one of the cooling pipes (1100).

7. The welding method for the cooling tube of the fusion device according to claim 6, characterized in that, The inclination angle of the bevel (1110) is 30°~35°; And / or, in the radial direction of the cooling pipe (1100), the width of the blunt edge (1120) is 1mm to 1.5mm.

8. The welding method for the cooling tube of the fusion device according to claim 6, characterized in that, When machining a bevel (1110) at the end of the cooling pipe (1100), the following is also included: Filler wire welding is performed on the two cooling pipes (1100) at the bevel (1110).

9. The welding method for the cooling tube of the fusion device according to claim 1, characterized in that, During the autofusion welding of the adapter (1200) and another cooling pipe (1100), a protective gas of 98% Ar + 2% N2 is added.

10. The welding method for the cooling tube of the fusion device according to claim 1, characterized in that, After welding the adapter (1200) and the other cooling pipe (1100), the system further includes: The welding position is inspected.

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