CN114273759A - Welding method of reactor core shroud assembly - Google Patents
Welding method of reactor core shroud assembly Download PDFInfo
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- CN114273759A CN114273759A CN202111653963.8A CN202111653963A CN114273759A CN 114273759 A CN114273759 A CN 114273759A CN 202111653963 A CN202111653963 A CN 202111653963A CN 114273759 A CN114273759 A CN 114273759A
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Abstract
The invention relates to the technical field of welding processes, in particular to a welding method of a reactor core shroud assembly, wherein a first bevel face and a second bevel face are formed at two ends of a first folded plate, a third bevel face and a fourth bevel face are formed at two ends of a second folded plate, and a plurality of processed first folded plates and second folded plates are alternately connected to form a cylinder; because the butt joint of the second bevel face and the fourth bevel face of same junction forms the backing weld groove, the butt joint of first bevel face and third bevel face forms TIG welding groove, the backing weld groove can supply first folded plate and second folded plate to carry out the backing weld, for first folded plate and second folded plate pass through TIG welding realization firm and satisfy the welding precision demand and provide the prerequisite, finally realize the TIG welding of the vertical welding seam of barrel, TIG welding through vertical welding seam, can realize the automatic weld of the vertical welding seam of reactor core shroud section of thick bamboo subassembly, when guaranteeing welding efficiency, can effectively reduce the welding cost of reactor core shroud section of thick bamboo subassembly.
Description
Technical Field
The invention relates to the technical field of welding processes, in particular to a method for welding a reactor core shroud assembly.
Background
The core shroud is located within the basket assembly and on the core support plate. The assemblies form the radial periphery of the core and provide a guide flow path for the reactor coolant as it passes through the core by controlling the dimensions of the plenum (i.e., controlling the clearance between the fuel assemblies and the core shroud). The core shroud, which limits the radial flow velocity or jet velocity of the coolant entering the core, allows the coolant (i.e., bypass flow) to flow through the cavity between the gondola and the outer wall of the core shroud.
The reactor core surrounding barrel mainly comprises a barrel body, a top plate and a bottom plate, wherein the bottom plate and the top plate are arranged at two ends of the barrel body, 2 annular gaps are formed between the top plate and the barrel body and between the bottom plate and the barrel body, the barrel body is formed by enclosing 4 first folded plates and 4 second folded plates, each first folded plate is arranged at an interval, each second folded plate is arranged between two adjacent first folded plates, and 8 longitudinal gaps are formed between the 4 first folded plates and the 4 second folded plates. When the reactor core shroud is assembled, 2 annular gaps and 8 longitudinal gaps of the reactor core shroud need to be welded, so that the reactor core shroud is kept stable.
The existing longitudinal seam welding for the reactor core shroud mainly comprises two welding forms, one is welding based on manual argon arc welding for welding the longitudinal seam, and the other is welding based on laser welding for welding the longitudinal seam. The welding line for welding the longitudinal seam by manual argon arc welding has high requirements on welding quality of welding personnel, the whole process is manual argon arc welding, the control difficulty of integral heat input is high, the welding precision of the reactor core shroud is difficult to ensure, the manufacturing period is long, and a large amount of welding resources are occupied. The welding route of the laser welding longitudinal seam has high requirements on a tool fixture used in the manufacturing process, an ultrahigh-power laser is required, and the overall welding cost is high.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a method for welding a reactor core shroud assembly, which solves the technical problem that the welding cost of the reactor core shroud in the prior art is high.
In order to achieve the technical purpose, the technical scheme of the invention provides a method for welding a reactor core shroud assembly, which comprises the following steps:
s100: processing a first folded plate and a second folded plate, forming a first bevel face and a second bevel face opposite to the first bevel face at two ends of the first folded plate, and forming a third bevel face and a fourth bevel face positioned at the same side of the third bevel face at two ends of the second folded plate;
s200: alternately arranging a plurality of processed first folded plates and second folded plates, connecting the end surface of each first folded plate to the fourth bevel face of the adjacent second folded plate to form a cylinder, butting the first bevel face and the third bevel face at the joint to form a TIG welding groove, and butting the second bevel face and the fourth bevel face to form a backing welding groove;
s300: backing welding is carried out on the joints of the first folded plates and the second folded plates through the backing welding grooves to form backing welding seams;
s400: and performing TIG welding on the joints of the first folded plates and the second folded plates through the TIG welding grooves to form longitudinal welding seams.
Optionally, in step S300, before the back welding, tack welding is performed on the adjacent first flap and the second flap, the tack welding including:
and welding a plurality of sections of short welding seams through the backing welding groove or the TIG welding groove, wherein the length of each section of short welding seam is 90-110 mm, the height of each section of short welding seam is 1.9-2.1 mm, and the interval of each section of welding seam is 95-105 cm.
Alternatively, in step S400, in the TIG welding, one or more pairs of TIG welding grooves symmetrical with respect to the central axis of the cylindrical body are simultaneously welded.
Optionally, in step S400, during the TIG welding, each TIG welding groove is divided into a plurality of segmented welding grooves for welding, and after all segmented welding grooves with the same height are welded, another segmented welding groove with the same height is welded until the TIG welding grooves are welded.
Optionally, in step S400, the cylinder is vertically placed on a rotary tool, a TIG welding device is used to automatically weld one of the sections of the TIG welding grooves, and after the TIG welding groove is welded, the rotary tool drives the cylinder to rotate until the TIG welding device completes welding of all the TIG welding grooves.
Optionally, in step S400, before the TIG welding, a tie bar is welded between each of the first flaps and each of the second flaps that are connected.
Optionally, in step S200, the backing welding groove is located on the inner side of the cylinder, and the TIG welding groove is located on the outer side of the cylinder;
in step S400, before TIG welding, back gouging is performed on the backing weld from the TIG welding groove, and an arc-shaped slope is formed at the root of the TIG welding groove, and the radius of the arc-shaped slope is between 4.1 mm and 4.5 mm.
Optionally, in step S100, when the first bevel face and the second bevel face are formed, a blunt edge with a length of 4.9-5.1 mm is formed between the first bevel face and the second bevel face.
Optionally, in step S200, a plurality of processed first folded plates and second folded plates are vertically placed on the surface of a bottom plate, and each of the first folded plates and each of the second folded plates are positioned on the surface of the bottom plate by an external tool, so as to form the cylinder body having the TIG welding groove and the welding groove, and then a top plate is covered on an end of the cylinder body, root gaps are formed between the first folded plates and the second folded plates and the bottom plate and between the first folded plates and the top plate, and annular welding grooves are formed on two sides of the root gaps;
and after the step S200, performing full penetration welding on the annular welding groove and the root gap.
Optionally, before the full penetration welding is performed on the annular welding groove and the root gap, backing welding is performed on the annular welding groove, then the deformation-preventing tool is welded on the inner side of the cylinder body, and then the backing welding in the step S300 is performed.
Compared with the prior art, the welding method of the reactor core shroud assembly provided by the invention has the beneficial effects that: the method comprises the steps that a first folded plate and a second folded plate are machined, a first bevel face and a second bevel face are formed at two ends of the first folded plate, a third bevel face and a fourth bevel face are formed at two ends of the second folded plate, and then a plurality of machined first folded plates and a plurality of machined second folded plates are connected alternately to form a barrel body of the reactor core surrounding barrel assembly; because the second bevel face and the fourth bevel face of same junction butt joint form the backing weld groove, first bevel face and the butt joint of third bevel face form TIG welding groove, the backing weld groove can supply first folded plate and second folded plate to carry out the backing weld, for first folded plate and second folded plate realize through TIG welding that stabilize and satisfy the welding precision demand and provide the prerequisite, finally realize the TIG welding of the vertical welding seam of barrel. Through TIG welding of vertical welding seam, can guarantee welding efficiency when realizing the automatic weld of the vertical welding seam of reactor core shroud subassembly, can effectively reduce the welding cost of reactor core shroud subassembly.
Drawings
Fig. 1 is a flowchart of a method for welding a core shroud assembly according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a core shroud assembly according to an embodiment of the present invention.
Fig. 3 is a top view of a core shroud assembly provided in an embodiment of the invention.
Fig. 4 is a partially enlarged view of a portion a in fig. 3.
Fig. 5 is a schematic structural view of a first flap of the core shroud assembly according to an embodiment of the present invention.
Fig. 6 is a partially enlarged view of a portion a in fig. 5.
Fig. 7 is a schematic structural view of a second flap of the core shroud assembly according to an embodiment of the present invention.
Fig. 8 is a partial enlarged view of a portion a in fig. 7.
Fig. 9 is a schematic structural view of the core shroud assembly according to the embodiment of the present invention before the connection between the first and second flaps is back-welded.
Fig. 10 is a structural schematic diagram of the core shroud assembly according to the embodiment of the present invention after the bottom welding of the connection between the first and second flaps.
Fig. 11 is a schematic structural view of the core shroud assembly according to the embodiment of the present invention after the joint between the first and second flaps is cleared.
Fig. 12 is a schematic structural view of the core shroud assembly according to the embodiment of the present invention after TIG welding of the connection between the first flap and the second flap.
Fig. 13 is a schematic view of the segmented welding of the core shroud assembly according to the embodiment of the present invention.
FIG. 14 is a schematic view of a symmetrical weld of a core shroud assembly provided by an embodiment of the invention.
Fig. 15 is a schematic view of an installation inside deformation prevention tool for a core shroud assembly according to an embodiment of the present invention.
Fig. 16 is a schematic structural view of a circumferential weld of a core shroud assembly according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
10-cylinder 11-backing weld groove 12-backing weld seam
13-TIG welding groove 14-longitudinal welding seam 20-top plate
30-top plate 40-first folded plate 41-C frame
42-first short plate 43-first bevel face 44-second bevel face
45-first inclined plane 46-first plane 47-second inclined plane
48-truncated edge 49-fifth bevel face 50-second folding plate
51-second short plate 52-third bevel face 53-fourth bevel face
54-second plane 55-third inclined plane 60-annular welding groove
70-root gap 131-arc slope 132-TIG welding plane
10 a-inner side deformation prevention tool.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a welding method of a reactor core shroud assembly, which comprises the following steps as shown in figures 1-12:
s100: processing a first folding plate 40 and a second folding plate 50, forming a first bevel surface 43 and a second bevel surface 44 opposite to the first bevel surface 43 at two ends of the first folding plate 40, and forming a third bevel surface 52 and a fourth bevel surface 53 on the same side of the third bevel surface 52 at two ends of the second folding plate 50;
s200: alternately arranging a plurality of processed first folded plates 40 and second folded plates 50, connecting the end surface of each first folded plate 40 to the fourth bevel face 53 of the adjacent second folded plate 50 to form a cylinder 10, butting the first bevel face 43 and the third bevel face 52 at the joint to form a TIG welding groove 13, and butting the second bevel face 44 and the fourth bevel face 53 to form a backing welding groove 11;
s300: backing welding is carried out on the joint of each first folded plate 40 and each second folded plate 50 through each backing welding groove 11 to form a backing welding seam 12;
s400: TIG welding is performed on the joint of each first folded plate 40 and each second folded plate 50 through each TIG welding groove 13 to form a longitudinal weld 14 so as to stabilize the connected first folded plate 40 and second folded plate 50.
Specifically, the barrel 10 of the reactor core shroud assembly is formed by processing a first folded plate 40 and a second folded plate 50, forming a first bevel surface 43 and a second bevel surface 44 at two ends of the first folded plate 40, forming a third bevel surface 52 and a fourth bevel surface 53 at two ends of the second folded plate 50, and then alternately connecting a plurality of processed first folded plates 40 and second folded plates 50; because the second bevel face 44 and the fourth bevel face 53 at the same joint are butted to form a backing welding groove 11, the first bevel face 43 and the third bevel face 52 are butted to form a TIG welding groove 13, the backing welding groove 11 can be used for backing welding the first folded plate 40 and the second folded plate 50, and a premise is provided for realizing stability and meeting the requirement of welding precision by TIG welding of the first folded plate 40 and the second folded plate 50, and finally realizing TIG welding of the longitudinal welding seam 14 of the barrel body 10, only when the TIG welding of the first folded plate 40 and the second folded plate 50 is carried out or after the TIG welding of the first folded plate 40 and the second folded plate 50 is finished, the circumferential weld is welded by the existing welding process, the welding of the reactor core surrounding barrel assembly can be realized, the TIG welding of the longitudinal welding seam 14 can realize the automatic welding of the longitudinal welding seam 14 of the reactor core surrounding barrel assembly by the TIG welding seam 14, and the welding efficiency is ensured, the welding cost of the reactor core shroud assembly can be effectively reduced.
In this embodiment, as shown in fig. 2 to 3, the reactor core shroud assembly includes a barrel 10, and a top plate 20 and a bottom plate fixed to two ends of the barrel 10, the bottom plate and the top plate 20 have the same structure and are both annular structures, the bottom plate, the top plate 20 and the barrel 10 are fixed by welding, the height of the barrel 10 is 4.8m, the barrel 10 includes 4 first folded plates 40 and 4 second folded plates 50, and the first folded plates 40 and the second folded plates 50 are alternately connected to form the barrel 10 structure.
As shown in fig. 2 to 3 and 5, the first flap 40 includes a C-shaped frame 41 having a thickness of 25.4mm and first short plates 42 perpendicularly fixed to both ends of the C-shaped frame 41, and a first bevel surface 43 and a second bevel surface 44 are located on end surfaces of the first short plates 42.
As shown in fig. 2 to 4 and 7, the second flap 50 includes 6 second short plates 51 with a thickness of 25.4mm, the 6 second short plates 51 are connected in sequence, two adjacent second short plates 51 are perpendicular to each other, a third bevel surface 52 and a fourth bevel surface 53 are located at the end of the second short plate 51 at the edge, and the first short plate 42 is perpendicular to the second short plate 51 at the outermost side and fixed by the backing weld 12 and the longitudinal weld 14.
In the present embodiment, the first bevel face 43, the second bevel face 44, the third bevel face 52, and the fourth bevel face 53 are formed by milling end faces of the first short plate 42 and the second short plate 51.
In this embodiment, as shown in fig. 5 to 6, the first bevel face 43 and the second bevel face 44 are located at the end of the first folding plate 40, and are respectively formed by opening the end face of the first short plate 42 toward the two side faces of the first short plate 42, the first bevel face 43 formed by opening is a quarter arc face, the second bevel face 44 formed by opening includes a first slope plane 45, a first plane 46 and a second slope plane 47 which are connected in sequence, the first slope plane 45 is connected with the end face of the first short plate 42, the first plane 46 is parallel to the side face of the first short plate 42, and the first slope plane 45 and the second slope plane 47 are arranged at an included angle with the side face of the first short plate 42.
As shown in fig. 7 to 8, the third bevel face 52 and the fourth bevel face 53 are formed by opening the end face of the second short plate 51 toward one side face of the second short plate 51, the third bevel face 52 is a quarter arc face connected with the end face of the second short plate 51, the second plane 54 is connected with the third bevel face 52, the fourth bevel face 53 includes a second plane 54 and a third slope plane 55 connected with each other, the third plane is arranged in parallel with the side face of the second short plate 51, and the third slope plane 55 is arranged at an included angle with the side face of the second short plate 51.
As shown in fig. 9, when the first folded plate 40 and the second folded plate 50 are connected, the end surface of the first short plate 42 is attached to the second flat surface 54, so that the first bevel surface 43 and the third bevel surface 52 are connected to form a semicircular groove, and the backing weld groove 11 having a V-shaped configuration is formed between the first bevel surface 45 and the second flat surface 54. The third inclined plane 55 and the second inclined plane 47 can enlarge the opening of the backing welding groove 11, so that the backing welding of the backing welding groove 11 is facilitated.
The radius of the semicircular groove is 5.8-6.2 mm, and the semicircular groove can provide convenience for controlling welding deformation. The included angle of the backing welding groove 11 is between 70 and 80 degrees.
Through the arrangement, the backing welding groove 11 is located on the inner side face of the cylinder 10, the TIG welding groove is located on the outer side face of the cylinder 10, and convenience is provided for back chipping of the TIG welding groove after backing welding is performed on the cylinder 10.
In this embodiment, the backing weld between each first flap 40 and each second flap 50 is performed by manual argon arc welding.
In the embodiment, the diameter of a hot wire of TIG welding is 1.2mm, the welding voltage is 10-18V, the voltage of the hot wire is 0.1-3V, the welding speed is 100-180 mm/min, and the maximum heat input is 2.592 KJ/mm.
Optionally, in step S300, tack welding is performed on the adjacent first and second flaps 40, 50 prior to the tack welding, the tack welding comprising: a plurality of short welding seams are welded through a backing welding groove 11 or a TIG welding groove 13, the length of each short welding seam is 90-110 mm, the height of each short welding seam is 1.9-2.1 mm, and the interval of each short welding seam is 95-105 cm.
Specifically, through the above arrangement, 4 sections of tack welds can be formed at each welding position of the cylinder 10, so as to provide a primary positioning for welding the cylinder 10.
In the embodiment, the first folded plate 40 and the second folded plate 50 are welded by manual argon arc welding, and in order to facilitate the welding work of the tack welding, the TIG welding groove 13 positioned on the outer side of the cylinder 10 is tack welded.
Alternatively, in step S400, in TIG welding, one or more pairs of TIG welding grooves 13 symmetrical with respect to the central axis of the cylindrical body 10 are simultaneously welded.
Specifically, as shown in fig. 14, the TIG welding grooves 13 at positions a and a1 in the drawing are welded by two TIG welding devices, the barrel 10 is rotated, and the TIG welding grooves 13 at positions B and B1, positions C and C1, and positions D and D1 are welded by the two TIG welding devices in sequence, so that the welding of the first folded plate 40 and the second folded plate 50 is finally completed.
Optionally, in step S400, during TIG welding, each TIG welding groove 13 is divided into a plurality of segmented welding grooves for welding, and after all the segmented welding grooves with the same height are welded, another segmented welding groove with the same height is welded until the TIG welding grooves 13 are welded.
In this embodiment, during TIG welding, each TIG welding groove 13 is divided into four segments, each segment is 1200mm in length, and by four-segment welding, deformation of the cylinder 10 during welding can be effectively reduced without affecting the welding efficiency of the cylinder 10.
Specifically, as shown in fig. 13, the tubular body 10 is divided into four sections a, b, c, and d in the drawing, and when TIG welding is performed, the TIG welding grooves 13 of the tubular body 10 at the section a at the lower end are welded first, and the TIG welding grooves 13 at the section b, the section c, and the section d are welded in order from the bottom to the top, so that the sectional welding of the tubular body 10 is finally performed, and by the above welding, the sectional welding of the tubular body 10 is performed, and the welding deformation is controlled by reducing the case where the single welding heat input is excessively concentrated.
Optionally, in step S400, the cylinder 10 is vertically placed on a rotary tool, a TIG welding device is used to automatically weld one of the sections of TIG welding grooves 13, and after the section of TIG welding groove 13 is welded, the rotary tool is rotated to drive the cylinder 10 to rotate until the TIG welding device completes welding of all TIG welding grooves 13.
Particularly, through the above arrangement, the welding efficiency of the cylinder 10 can be effectively accelerated and the welding difficulty of the cylinder 10 can be reduced.
In this embodiment, because barrel 10 adopts TIG welded mode to weld, consequently can realize that barrel 10 welds along vertical direction, through vertical welded form, can place barrel 10 vertically on rotatory frock for barrel 10 can stabilize in the surface of rotatory frock under the dead weight, and vertical the placing for the level place, can effectively avoid barrel 10 to lead to the welding position to warp because of self gravity.
Optionally, in step S400, before TIG welding, a tie bead is welded between the connected first flaps 40 and second flaps 50.
Specifically, the weld tie bars may effectively reduce deformation of the first and second flaps 40, 50 during TIG welding.
In this embodiment, the welding lacing wire welds on the medial surface of barrel 10, and the welding lacing wire setting is welded after the backing weld of barrel 10, because the welding lacing wire welds in the medial surface of barrel 10, the welding lacing wire setting can avoid causing the influence to the backing weld after the backing weld of barrel 10.
In this embodiment, the welding tie bars are provided with a plurality of blocks, and the welding tie bars may be plate bodies or rod bodies.
Optionally, in step S200, as shown in fig. 2 to 12, the backing welding groove 11 is located on the inner side of the cylinder 10, and the TIG welding groove 13 is located on the outer side of the cylinder 10;
specifically, since it is necessary to back off the TIG welding groove 13 after back off the barrel 10 and to perform TIG welding on the TIG welding groove 13 after back off, providing the TIG welding groove 13 outside the barrel 10 can provide convenience for the back off of the TIG welding groove and the TIG welding of the TIG welding groove.
In step S400, as shown in fig. 11, before TIG welding, the backing weld 12 is back-gouged from the TIG welding groove 13, and a circular arc slope 131 is formed at the root of the TIG welding groove 13, and the radius of the circular arc slope 131 is 4.1 to 4.5 mm.
Specifically, the back-gouged TIG welding groove 13 is connected to the backing weld 12, and the setting of the arc-shaped slope 131 at the root of the TIG welding groove 13 can facilitate the deformation control of TIG welding and reduce the deformation at the root of the TIG welding groove 13 due to the high temperature at the root of the TIG welding groove 13.
In this embodiment, as shown in fig. 11, the back-gouged TIG welding groove 13 further includes TIG welding planes 132 connected to both ends of the arc slope 131, an included angle between the TIG welding plane 132 and a symmetry axis of the arc slope 131 is between 10 ° and 15 °, and the depth of the back-gouged TIG welding groove 13 is between 12 mm and 14.5 mm.
Alternatively, in step S100, as shown in FIGS. 5 to 6 and 9 to 10, when the first and second bevel faces 43 and 44 are formed, a blunt edge 48 having a length of 4.9 to 5.1mm is formed between the first and second bevel faces 43 and 44.
Specifically, when the first folded plate 40 is connected to the second folded plate 50, the truncated edge 48 is attached to the second plane 54 of the second folded plate 50, the truncated edge 48 can prevent the backing welding groove 11 from being welded through when the backing welding of the cylinder 10 is performed, and the truncated edge 48 in the length range can provide convenience for back chipping of the TIG welding groove 13.
Optionally, in step S200, a plurality of processed first folded plates 40 and second folded plates 50 are vertically placed on the surface of the bottom plate, and the first folded plates 40 and the second folded plates 50 are positioned on the surface of the bottom plate by an external tool to form a cylinder 10 having a TIG welding groove 13 and a welding groove, and then the top plate 20 is covered on the end of the cylinder 10, as shown in fig. 16, root gaps 70 with a width of 1.9 to 2.1mm are formed between the first folded plates 40 and the second folded plates 50 and the bottom plate and between the top plate 20, and annular welding grooves 60 are formed on two sides of the root gaps 70; after step S200, full penetration welding is performed on the annular welding groove 60 and the root gap 70.
Specifically, with the above arrangement, stable welding between the cylinder 10 and the top plate 20 and the bottom plate can be achieved.
Optionally, as shown in fig. 15, before the full penetration welding is performed on the annular welding groove 60 and the root gap 70, the annular welding groove 60 is subjected to backing welding, the inner side deformation prevention tool 10a is welded on the inner side of the cylinder 10, and then the backing welding in step S300 is performed.
Specifically, it is right annular welding groove 60 carries out the backing weld and can stabilize barrel 10 and bottom plate and roof 20, and the deformation of first folded plate 40 and second folded plate 50 when the deformation frock of preapring for an unfavorable turn of events can effectively alleviate the inboard deformation frock 10a of welding after stabilizing, and after the deformation frock 10a of preapring for an unfavorable turn of events of welding inboard, can stabilize first folded plate 40 and second folded plate 50, when lightening the backing weld in step S300, the deformation of first folded plate 40 and second folded plate 50.
In this embodiment, the annular welding groove 60 is formed by, in step S100, as shown in fig. 16, forming two fifth opposing groove surfaces 49 at the other two ends of the first flap 40 and the other two ends of the second flap 50 when the first flap 40 and the second flap 50 are processed;
in step S200, a plurality of processed first folded plates 40 and second folded plates 50 are vertically placed on the surface of the bottom plate, and the first folded plates 40 and the second folded plates 50 are positioned on the surface of the bottom plate by an external tool, when the cylinder 10 having the TIG welding groove 13 and the welding groove is formed, a certain gap is left between the cylinder 10 and the top plate 20 and the bottom plate, an upper end welding groove is formed between two fifth bevel face surfaces 49 at the upper end of the cylinder 10 and the top plate 20, and a lower end welding groove is formed between two fifth bevel face surfaces 49 at the lower end of the cylinder 10 and the bottom plate.
Specifically, through this setting, can make upper end welding groove and lower extreme welding groove all form symmetrical structure, when welding upper end welding groove and lower extreme welding groove, can weld the both sides of upper end welding groove and the both sides of lower extreme welding groove simultaneously to the atress is even when making the both sides welding of barrel 10, with the straightness that hangs down between assurance barrel 10 and roof 20 and the bottom plate.
In this embodiment, when carrying out the tack welding to first folded plate 40 and second folded plate 50, carry out the tack welding to upper end welding groove and lower extreme welding groove simultaneously, the tack welding of upper end welding groove and lower extreme welding groove includes: welding seams with the length of 45-55 mm are welded at the upper end welding groove and the lower end welding groove formed at the two ends of the first short plate 42 and the second short plate 51, and two welding seams with the length of 45-55 mm are welded at the upper end welding groove and the lower end welding groove formed at the two ends of the C-shaped frame 41 and are spaced from each other.
In this embodiment, after the tack welding is performed on the upper end welding groove and the lower end welding groove, the upper end welding groove and the lower end welding groove are subjected to the backing welding, and after the backing welding is performed on the upper end welding groove and the lower end welding groove, the inner side of the cylinder 10 is provided with the deformation-preventing tool 10a, the first folded plate 40 and the second folded plate 50 are stabilized, and then the backing welding in step S300 is performed.
In this embodiment, after the TIG welding in step S400 is completed, the welding of the annular groove is performed.
In this embodiment, the tack welding, the backing welding, and the final welding of the annular groove between the cylinder 10 and the bottom plate are performed by manual argon arc welding.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method for welding a reactor core shroud assembly is characterized by comprising the following steps:
s100: processing two ends of a first folded plate and a second folded plate, forming a first bevel face and a second bevel face opposite to the first bevel face at the two ends of the first folded plate, and forming a third bevel face and a fourth bevel face positioned at the same side of the third bevel face at the two ends of the second folded plate;
s200: alternately connecting a plurality of processed first folded plates and second folded plates to form a cylinder body, wherein the first bevel face and the third bevel face at the same connecting position are butted to form a TIG welding groove, and the second bevel face and the fourth bevel face at the same connecting position are butted to form a backing welding groove;
s300: backing welding is carried out on the joints of the first folded plates and the second folded plates through the backing welding grooves to form backing welding seams;
s400: and performing TIG welding on the joints of the first folded plates and the second folded plates through the TIG welding grooves to form longitudinal welding seams.
2. The method of welding the core shroud assembly of claim 1, wherein in step S300, tack welding is performed on the adjacent first and second flaps before the tack welding is performed, the tack welding including:
and welding a plurality of sections of short welding seams through the backing welding groove or the TIG welding groove, wherein the length of each section of short welding seam is 90-110 mm, the height of each section of short welding seam is 1.9-2.1 mm, and the interval of each section of welding seam is 95-105 cm.
3. The core shroud assembly welding method according to claim 1, characterized in that, in step S400, in the TIG welding, one or more pairs of TIG welding grooves symmetrical with respect to a central axis of the cylindrical body are simultaneously welded.
4. The method for welding a core shroud ring assembly according to claim 1, wherein in step S400, during the TIG welding, each TIG welding groove is divided into a plurality of segmental welding grooves and welding is performed, and after all segmental welding grooves of the same height have been welded, another segmental welding groove of the same height is welded until the TIG welding grooves have been welded.
5. The method for welding the core shroud assembly of claim 1, characterized in that in step S400, the barrel is vertically placed on a rotary tool, a TIG welding device is used to automatically weld a segment of the TIG welding groove, and after the segment of the TIG welding groove is welded, the rotary tool drives the barrel to rotate until the TIG welding device completes welding of all the TIG welding grooves.
6. The core shroud assembly welding method as claimed in claim 1, wherein in step S400, before the TIG welding, tie bars are welded between the connected first flaps and second flaps.
7. The method of welding the core shroud assembly of claim 1,
in step S200, the backing welding groove is located on the inner side of the cylinder, and the TIG welding groove is located on the outer side of the cylinder;
in step S400, before TIG welding, back gouging is performed on the backing weld from the TIG welding groove, and an arc-shaped slope is formed at the root of the TIG welding groove, and the radius of the arc-shaped slope is between 4.1 mm and 4.5 mm.
8. The method for welding the core shroud assembly of claim 1, wherein in step S100, a blunt edge having a length of 4.9 to 5.1mm is formed between the first and second chamfer surfaces when the first and second chamfer surfaces are formed.
9. The method for welding a core shroud assembly according to any one of claims 1 to 8,
in step S200, vertically placing a plurality of processed first folded plates and second folded plates on the surface of a bottom plate, positioning each first folded plate and each second folded plate on the surface of the bottom plate through an external tool to form a cylinder body with the TIG welding groove and the welding groove, covering a top plate on the end of the cylinder body, forming root gaps with the width of 1.9-2.1 mm between the first folded plates and the second folded plates and the bottom plate and between the first folded plates and the second folded plates and the top plate, and forming annular welding grooves on two sides of the root gaps;
and after the step S200, performing full penetration welding on the annular welding groove and the root gap.
10. The method for welding the core shroud assembly of claim 9, wherein before the full penetration welding of the annular welding groove and the root gap, the annular welding groove is back-welded, an inner deformation prevention tool is welded to the inner side of the barrel, and the back-welding in step S300 is performed.
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