A welding device for welding nickel washers

Abstract

The present invention belongs to the field of pressure vessel maintenance engineering, and specifically discloses a welding device for welding nickel washers, including: a base, a channel, a slide, a slider and a fixing device, the channel is arranged inside the base and penetrates the top surface and the side surface of the base to form a first open opening and a second open opening, the slide is symmetrically opened on both sides of the first open opening on the top surface of the base, the slider cooperates with the slide and is slidably connected to the slide respectively, the fixing device is arranged on the top surface of the slider and is detachably connected to the slider; the second open opening is connected to an inert gas source, and the inert gas flows out from the first open opening through the channel. The device of the present invention has a simple structure and is easy to operate. By providing a continuous and stable inert gas in the welding area, oxidation of the weld can be effectively avoided, and inert gas is continued to be provided after welding until the weld is completely cooled, effectively reducing the occurrence of weld overheating. At the same time, the free contraction of the weld is achieved by setting the slider, and the quality of the weld is effectively improved.

Description

Technical Field

[0001] The invention belongs to the field of pressure vessel maintenance engineering, and in particular relates to a welding device for welding nickel washers. Background Art

[0002] The nickel gasket of the main sealing surface of the reactor pressure vessel of a nuclear power plant is made of nickel wire bent into a circle and welded at the interface. It is installed in the V-groove of the main sealing surface of the pressure vessel. Under the tightening action of the bolts and nuts on the main sealing surface, it is pressed by the sealing surface of the upper component to seal the upper component and the pressure vessel. The welding quality of the nickel gasket plays an important role in ensuring the sealing of the reactor pressure vessel.

[0003] Since nickel has a relatively active chemical property, it is easily oxidized during the welding process, resulting in thermal cracks and pores. Therefore, the protection of the welding area during and after welding is an important factor in determining the quality of the weld.

[0004] However, in the existing welding method, the nickel wire is very easy to oxidize during the welding process and cause the weld to overheat, and lacks protection for the weld.

[0005] In addition, to ensure the sealing of the nickel gasket, the stress of the nickel gasket itself should be reduced as much as possible, so the free contraction of the nickel gasket weld should be ensured during the entire welding process. The existing welding method adopts the method of reducing the clamping force when positioning the parent material on both sides of the weld, which cannot achieve the requirement of completely free contraction of the nickel gasket weld.

[0006] Based on this, it is urgent to develop a welding device for welding nickel gaskets to meet the welding requirements of the nickel gaskets used for the sealing surface of the pressure vessel. Summary of the invention

[0007] The object of the present invention is to provide a welding device for welding nickel washers. The device has a simple structure and is easy to operate. By providing continuous and stable inert gas in the welding area, oxidation of the weld can be effectively avoided. After welding is completed, inert gas is continued to be provided until the weld is completely cooled, thereby effectively reducing the occurrence of weld overheating. At the same time, the free contraction of the weld is achieved through the setting of a slider, thereby effectively improving the quality of the weld.

[0008] A technical solution to achieve the purpose of the present invention: A welding device for welding nickel washers, the device comprising: a base, a channel, a slide groove, a slider and a fixing device, the channel is arranged inside the base and passes through the top surface and the side surface of the base to form a first open opening and a second open opening, the slide groove is symmetrically opened on both sides of the first open opening on the top surface of the base, the slider cooperates with the slide groove and is slidably connected to the slide groove respectively, the fixing device is arranged on the top surface of the slider and is detachably connected to the slider; the second open opening is connected to an inert gas source, and the inert gas flows out from the first open opening through the channel.

[0009] Furthermore, the channel includes a vertical channel and a transverse channel, and the transverse channel is connected to the vertical channel.

[0010] Furthermore, the vertical channel includes a first channel, a second channel and a third channel, which are fixedly connected in sequence from top to bottom and interconnected, the aperture of the first channel is larger than the aperture of the second channel, and the aperture of the second channel is larger than the aperture of the third channel.

[0011] Furthermore, the channel also includes a gas diversion channel, which is symmetrically arranged on the upper part of the slide groove position on both sides of the first channel and is connected to the first channel.

[0012] Furthermore, the sliding block is provided with a V-shaped groove on its top surface in a direction parallel to the slide groove, and the V-shaped groove runs through the left and right sides of the sliding block.

[0013] Furthermore, the fixing device includes a pressing plate and a fastener, wherein the pressing plate is arranged on the top surface of the slider and covers the V-shaped groove, the fastener cooperates with the pressing plate, and the pressing plate and the slider are detachably connected via the fastener.

[0014] Furthermore, the device also includes an air screen, which is fixedly connected to the inner wall of the second channel.

[0015] Furthermore, the air screen is fixedly connected to the second channel via threads.

[0016] Furthermore, the air screen comprises a base, a screen plate and mesh holes, the screen plate is sealed and connected to the top of the base, and the mesh holes are arranged on the screen plate and penetrate the upper and lower surfaces of the screen plate.

[0017] The beneficial technical effects of the present invention are:

[0018] 1. A welding device for welding nickel washers of the present invention adopts a specific channel design, and realizes a smooth and uniform outflow of protective gas through three channels with apertures increasing from bottom to top, and realizes comprehensive protection of the nickel washers, including the weld of the nickel washers and the nickel rods placed in the V-shaped grooves, through the central area of ​​the first channel and the gas diversion channel arranged above the slide groove, that is, above the transverse channel where the slider is located; and then the inert protective gas is controlled to cover the nickel rod specimens in the welding area and the slide groove area in a continuous steady flow state, isolate the air, and quickly reduce the temperature of the specimens, effectively reducing the oxidation probability of the nickel rod specimens in the welding area during the open environment welding process and reducing the occurrence of weld overheating, improving the weld quality, ensuring the protection effect of the nickel rod during the welding process and the cooling process of the welding area, and realizing the dual protection of the inert gas for the nickel rod specimens by isolation and cooling;

[0019] 2. The welding device for welding nickel washers of the present invention cooperates with the slide block on the top surface of the base, so that the slide block can slide left and right in the slide block, which can effectively ensure that during the welding process and the cooling process of the welding area, the weld of the nickel washers is given a free shrinkage margin through the two slidable slide blocks, thereby improving the quality of the weld and effectively ensuring the final sealing effect of the nickel washers;

[0020] 3. The welding device for welding nickel washers of the present invention is made of red copper. The good thermal conductivity of red copper helps to quickly reduce the temperature of the nickel rod test piece. At the same time, the soft material of red copper can prevent the nickel washers from being scratched, effectively reducing the generation of defective products during the processing of nickel washers.

[0021] 4. The welding device for welding nickel washers of the present invention has a simple structure and is easy to operate, which effectively saves time and manpower investment costs, greatly improves production efficiency, and can be applied to the processing of nickel washers on the sealing surfaces of pressure vessels of various sizes through adaptive adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A structural schematic diagram of a welding device for welding a nickel washer provided by the present invention;

[0023] Figure 2 A cross-sectional structural diagram of a welding device for welding a nickel washer provided by the present invention;

[0024] Figure 3 A top view of a welding device for welding nickel washers provided by the present invention after removing the air screen;

[0025] Figure 4 A schematic structural diagram of a vertical channel in a welding device for welding a nickel washer provided by the present invention;

[0026] Figure 5 A schematic diagram of the structure of an air screen in a welding device for welding nickel washers provided by the present invention;

[0027] Figure 6 This is a structural schematic diagram of a slider in a welding device for welding nickel washers provided by the present invention;

[0028] Figure 7 for Figure 6 Schematic diagram of the structure in the AA section direction.

[0029] In the figure: 1, base; 2, channel; 3, slide groove; 4, slider; 5, fixing device; 6, gas screen; 11, first open mouth; 12, second open mouth; 21, vertical channel; 22, transverse channel; 23, gas diversion channel; 41, V-shaped groove; 51, pressing sheet; 52, fastener; 61, base; 62, screen plate; 63, mesh; 211, first channel; 212, second channel; 213, third channel. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 As shown, a welding device for welding nickel washers provided by the present invention is made of red copper and includes: a base 1, a channel 2, a chute 3, a slider 4 and a fixing device 5. The base 1 is a cylindrical structure, and a channel 2 for introducing an inert gas is opened downward at the center of the top surface of the base 1, which penetrates the interior of the base 1 and forms a first open opening 11 and a second open opening 12 on the top surface and side of the base 1. On the top surface of the base 1, chute 3 is symmetrically opened downward on the left and right sides of the first open opening 11, and the chute 3 is an inverted T-shaped structure. A slider 4 matching the chute 3 is slidably connected in each chute 3, and each slider 4 can move left and right along the corresponding chute 3. A fixing device 5 is provided on the top surface of each slider 4 for fixing the nickel rod. The fixing device 5 is detachably connected to the slider 4. The second open opening 12 is connected to the inert gas source, and the inert gas flows out from the first open opening 11 through the channel 2. When the nickel rod is clamped, the joints at both ends of the nickel rod bent into a circle are placed in the central area of ​​the first channel 211 between the two sliders 4, that is, the welding area, and then the two ends of the nickel rod are clamped by two fixing devices 5.

[0032] like Figure 2 As shown, the channel 2 includes a vertical channel 21 and a transverse channel 22, and the transverse channel 22 is connected to the vertical channel 21; the top end of the vertical channel 21 passes through the top surface of the base 1 and forms a first open opening 11 on the top surface of the base 1, and the side end of the transverse channel 22 passes through the side surface of the base 1 and forms a second open opening 12 on the side surface of the base 1.

[0033] like Figure 2 and Figure 4 As shown, the vertical channel 21 includes a first channel 211, a second channel 212 and a third channel 213. The first channel 211, the second channel 212 and the third channel 213 are all cylindrical structures and are fixedly connected and interpenetrating from top to bottom. The aperture of the first channel 211 is larger than that of the second channel 212, and the aperture of the second channel 212 is larger than that of the third channel 213. An air screen 6 is fixedly connected to the inner side wall of the second channel 212.

[0034] The apertures of the first channel 211, the second channel 212 and the third channel 213 increase from bottom to top in order to ensure that the gas flow is output smoothly and evenly. Specifically, the first channel is mainly the welding operation area. The aperture of the first channel is designed to be slightly larger than that of the second channel. The purpose is to expand the gas protection area and protect the high-temperature part of the heat-affected zone. The second channel is mainly for installing a gas screen for gas uniformity. After the high-speed gas enters the second channel area, the speed is reduced, and then it passes through the gas screen, so that the gas flows out stably and evenly. The third channel is the vertical air inlet below. The method of directly connecting to the first channel from the side is not adopted. It is mainly because the air intake direction is perpendicular to the protection object, which can reduce gas turbulence and ensure stable and uniform gas outflow.

[0035] like Figure 3 As shown, four gas diversion channels 23 are symmetrically arranged at the upper part of the slide grooves on both sides of the first channel 211, and the four gas diversion channels 23 are all connected to the first channel 211. The protective gas is argon gas, which has a greater density than air. After passing through the first channel 211, a part of it flows out from the first open port 11 of the first channel 211, and a part of it flows out from the gas diversion channels 23, thereby achieving comprehensive protection of the nickel gasket, including the weld of the nickel gasket and the nickel rod placed in the V-shaped groove. Figure 2 As shown, the second open port 12 is connected to the inert gas source, and the inert gas flows out from the first open port 11 after passing through the transverse channel 22, the third channel 213, the second channel 212, the gas screen 6 and the first channel 211, forming an inert gas protection area surrounding the welding area. During the welding process and the cooling process of the welding area, the inert gas forms a steady-flow gas protection ring that fully surrounds the welding area at the two-end joint of the nickel rod, fully isolates the weld area from the external air, and quickly reduces the temperature of the base material in the welding area, which can greatly reduce the oxidation probability of the weld area and improve the quality of the weld. In this embodiment, argon is selected as the inert gas to protect and isolate the welding area.

[0036] like Figure 1 , Figure 6 and Figure 7 As shown, the slider 4 has a V-shaped groove 41 on its top surface in a direction parallel to the slide groove 3. The V-shaped groove 41 runs through the left and right sides of the slider 4. The V-shaped groove 41 is used to accommodate the nickel rod. The fixing device 5 includes a pressing plate 51 and a fastener 52. The pressing plate 51 is arranged on the top surface of the slider 4 and covers the V-shaped groove 41. The fastener 52 cooperates with the pressing plate 51. The pressing plate 51 and the slider 4 are detachably connected through the fastener 52.

[0037] When the nickel rod is fixed and clamped, the nickel rod is placed in the V-groove 41, and after the pressing sheet 51 covers the nickel rod in the V-groove 41, the two ends of the pressing sheet 51 are fastened to the two sides of the V-groove 41 on the top surface of the slider 4 through detachable fasteners 52, thereby fixing the nickel rod in the V-groove 41. In this embodiment, connecting holes are symmetrically opened on both sides of the V-groove 41 on the slider 4, and fixing holes are symmetrically opened on the pressing sheet 51, the fixing holes match the connecting holes, and screws are selected as fasteners 52, the screws match the connecting holes and the fixing holes, and the nickel rod is fixed in the V-groove 41 of the slider 4 through the pressing sheet 51. During the welding process and the cooling process of the welding area, when the nickel rod shrinks, the two slidable sliders 4 are used to give the weld a free shrinkage margin, thereby improving the quality of the weld.

[0038] like Figure 5 As shown, the gas screen 6 includes a base 61, a mesh plate 62 and meshes 63. The base 61 is a cylindrical structure. The mesh plate 62 is sealed and connected to the top of the base 61. A plurality of meshes 63 are arranged at intervals on the mesh plate 62, and the meshes 63 penetrate the upper and lower surfaces of the mesh plate 62. When the inert gas passes through the gas screen 6, it flows out through the meshes 63.

[0039] In this embodiment, an internal thread section is opened downward at the top of the inner side of the second channel 212; an external thread section corresponding to and matching the internal thread section of the second channel 212 is provided on the outer wall of the base 61, and the air screen 6 is screwed and fixedly connected in the second channel 212 through the thread cooperation between the internal thread section and the external thread end.

[0040] The use method of a welding device for welding a nickel washer provided by the present invention is specifically as follows:

[0041] Step (1), placing the two end joints of the nickel rod bent into a circle into the central area of ​​the first channel 211 between the two slide blocks 4 of the welding device, i.e., the welding area;

[0042] Step (2), placing the nickel rod in the V-shaped groove 41, and clamping the nickel rod by two fixing devices;

[0043] Step (3), connecting the second open port 12 of the welding device to an inert gas source, and continuously introducing inert gas into the second open port 12 of the welding device, so that the inert gas flows out from the first open port 11 of the welding device to form a gas protection ring surrounding the welding area at the joints at both ends of the nickel rod;

[0044] Step (4), according to the welding requirements, adjust the gap between the two ends of the nickel rod, keep the slider 4 in a state of free contraction, and then perform welding;

[0045] After step (5) welding is completed, the inert gas continues to flow out to form a gas protection ring surrounding the joints at both ends of the nickel rod, that is, the welding area of ​​the weld, until the nickel rod with the weld cools to room temperature;

[0046] Step (6), loosen the clamping of the two fixing devices, take out the welded nickel washer, and inspect and polish the welding part;

[0047] Step (7), measuring the size after grinding, if it meets the requirements, the weld is qualified by non-destructive inspection, and the welding of the nickel washer is completed.

[0048] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A welding device for welding nickel washers, characterized in that: The device comprises: a base (1), a channel (2), a slide groove (3), a slider (4) and a fixing device (5); the channel (2) is arranged inside the base (1) and penetrates the top surface and the side surface of the base (1) to form a first open opening (11) and a second open opening (12); the slide groove (3) is symmetrically arranged on both sides of the first open opening (11) on the top surface of the base (1); the slider (4) cooperates with the slide groove (3) and is respectively slidably connected to the slide groove (3); the fixing device (5) is arranged on the top surface of the slider (4) and is detachably connected to the slider (4); the second open opening (12) is connected to an inert gas source, and the inert gas flows out from the first open opening (11) through the channel (2); The channel (2) comprises a vertical channel (21) and a transverse channel (22), and the transverse channel (22) is connected to the vertical channel (21); The vertical channel (21) comprises a first channel (211), a second channel (212) and a third channel (213); the first channel (211), the second channel (212) and the third channel (213) are fixedly connected in sequence from top to bottom and are interconnected; the aperture of the first channel (211) is larger than the aperture of the second channel (212); and the aperture of the second channel (212) is larger than the aperture of the third channel (213); The slider (4) is provided with a V-shaped groove (41) on its top surface in a direction parallel to the slide groove (3), and the V-shaped groove (41) runs through the left and right sides of the slider (4); The fixing device (5) comprises a pressing plate (51) and a fastener (52); the pressing plate (51) is arranged on the top surface of the slider (4) and covers the V-shaped groove (41); the fastener (52) cooperates with the pressing plate (51); the pressing plate (51) and the slider (4) are detachably connected via the fastener (52); When the nickel rod is fixedly clamped, the nickel rod is placed in the V-shaped groove (41), and after the pressing sheet (51) covers the nickel rod in the V-shaped groove (41), two ends of the pressing sheet (51) are respectively fastened to two sides of the V-shaped groove (41) by fasteners (52), thereby fixing the nickel rod in the V-shaped groove (41).

2. A welding device for welding nickel washers according to claim 1, characterized in that: The channel (2) further comprises a gas diversion channel (23), wherein the gas diversion channels (23) are symmetrically arranged at the upper part of the slide groove positions on both sides of the first channel and are in communication with the first channel (211).

3. A welding device for welding nickel washers according to claim 1, characterized in that: The device further comprises an air screen (6), which is fixedly connected to the inner wall of the second channel (212).

4. A welding device for welding nickel washers according to claim 3, characterized in that: The air screen (6) is fixedly connected to the second channel (212) via threads.

5. A welding device for welding nickel washers according to claim 3, characterized in that: The air screen (6) comprises a base (61), a screen plate (62) and mesh holes (63); the screen plate (62) is sealed and connected to the top of the base (61); the mesh holes (63) are arranged on the screen plate (62) and penetrate the upper and lower surfaces of the screen plate (62).

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