CN114951902B - Construction method suitable for welding seam of reactor body of nuclear power station reactor - Google Patents
Construction method suitable for welding seam of reactor body of nuclear power station reactor Download PDFInfo
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- CN114951902B CN114951902B CN202210452669.9A CN202210452669A CN114951902B CN 114951902 B CN114951902 B CN 114951902B CN 202210452669 A CN202210452669 A CN 202210452669A CN 114951902 B CN114951902 B CN 114951902B
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- 238000003466 welding Methods 0.000 title claims abstract description 278
- 238000010276 construction Methods 0.000 title claims abstract description 39
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 38
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- 239000011229 interlayer Substances 0.000 claims description 15
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 13
- 239000010935 stainless steel Substances 0.000 claims description 13
- 210000001503 joint Anatomy 0.000 claims description 11
- 238000010891 electric arc Methods 0.000 claims description 6
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The construction method is suitable for welding seams of reactor bodies of nuclear power stations, wherein the welding seams of the reactor bodies (hereinafter referred to as reactor bodies) are V+U-shaped narrow-gap grooves, the angle of each V-shaped groove is 25+/-2.5 degrees, the angle of each U-shaped groove is 5 degrees, the radius of each U-shaped root is 6-8mm, 2 x 2mm transition sections are adopted between each V-shaped groove and each U-shaped groove, and the depth of each V-shaped groove is 20-30mm. The upper-section pile body and the lower-section pile body adopt argon arc welding to carry out bottom welding, and inner side welding and outer side welding are sequentially carried out after the bottom welding. The bottom layer welding adopts a positioning welding and symmetrical back welding method for welding, the V-shaped groove adopts manual welding, and the U-shaped groove adopts a cross arm frame type submerged arc welding machine. The invention is mainly suitable for welding the reactor body of the nuclear power station, ensures the manufacturing and processing precision of the reactor body to be fully ensured, greatly improves the welding quality and the production efficiency, reduces the production cost, obviously reduces pollution, improves the labor environment of welders and has wide application range.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a construction method suitable for a welding line of a reactor body of a nuclear power station.
Background
For the welding construction of the reactor body of the thick-wall nuclear power station reactor, the current better technical model is to machine and process U+V-shaped grooves (U-shaped on the outer side, 20 degrees in included angle and V-shaped on the inner side, 60 degrees in included angle) through machining, perform backing welding by using a special flux-cored wire for stainless steel backing, and after the backing is qualified through inspection, perform capping welding by constructors. By adopting the operation mode, the quality problems of weld carburization and the like which are easily and highly generated in the conventional one-side welding, back-side gouging and back-grinding operation mode and personal injury to constructors caused by grinding noise, dust and the like can be effectively avoided.
However, in order to ensure the welding effect of single-sided welding and double-sided one-step forming, when the thick-wall stainless steel cylinder section is assembled, a certain circumferential gap is always needed to be reserved, the tool fixture is used for fixing the position, and meanwhile, when a welder performs bottom layer welding on the inner side, argon is used for welding protection on the outer side, and after the welding construction is finished, the fixing tool fixture and the fixture are manually removed. Factors such as constructor quality, assembly clearance control, product precision all can cause the influence of welding quality to different extents, often can appear the unstable condition of welding quality. Meanwhile, the assembly pair construction, the mounting/dismounting of the fixture clamp and the like can also increase a lot of construction cost, and the construction efficiency and quality are seriously affected.
Disclosure of Invention
In order to solve the problems, the invention provides a construction method applicable to a welding line of a reactor body of a nuclear power station, which aims to achieve the purposes of reducing welding difficulty and improving welding efficiency and quality, and adopts the following technical scheme:
a construction method applicable to a welding line of a reactor body of a nuclear power station comprises the following steps:
s1: the welding seams of the reactor body (hereinafter referred to as the reactor body) adopt V+U-shaped narrow gap grooves, the angle of the V-shaped groove is 25+/-2.5 degrees, the angle of the U-shaped groove is 5 degrees, the radius of the U-shaped root is 6-8mm, a 2 x 2mm transition section is adopted between the V-shaped groove and the U-shaped groove, and the depth of the V-shaped groove is 20-30mm; and cleaning the processed U-shaped groove, V-shaped groove, oxide and other dirt within the range of 20mm, and polishing to leak metallic luster by using a special polishing machine for stainless steel. The V-shaped groove is the inner side of the pile body, and the U-shaped groove is the outer side of the pile body.
S2, vertically butting the polished upper section pile body (1) and the polished lower section pile body (2), welding a bottom layer by using argon arc welding, welding the bottom layer by adopting positioning welding to form 50-70mm nail welding points, spacing 300mm between every two nail welding points, and then welding a welding seam by adopting a symmetrical back welding method; after the argon arc welding is started, the electric arc is utilized to melt the base metal and form a cavity of 3-5mm, the double-pass welding is carried out in a mode that the included angle between a welding gun and a welding line is 85-90 degrees and the electric arc height is 3-4mm, and finally the welding line with the thickness of more than 5mm is formed; the diameter of a welding wire adopted by argon arc welding is 2.0mm, the welding current is 150-170A, and the arc striking current is 20A. In the argon arc welding process, the welding wire cannot leave the protection of argon, the wire feeding is stable and uniform, and the wire feeding is prevented from disturbing the shielding gas too fast to enable the welding seam to generate air holes.
S3: after the bottom layers of the upper-section pile body (1) and the lower-section pile body (2) are welded, the two-section pile body is placed on a rotating tire (9) for subsequent welding, a manual welding rod with the diameter of 3.2mm, the current of 90-110A or the diameter of 4.0mm and the current of 140-160A is used for welding, a V-shaped groove is welded in a multi-layer way manner, the width of each welding line is smaller than 3 times of the diameter of the welding rod, the interlayer temperature is smaller than 150 degrees, the V-shaped groove cover layer is welded by adopting a low-current linear rapid welding method, the inter-channel temperature is smaller than 100 degrees, and the concave-convex degree between the welding lines is smaller than 1mm.
The U-shaped groove is welded by a cross arm type submerged arc welding machine (hereinafter referred to as submerged arc welding machine), the submerged arc welding machine is perpendicular to a welding line, the distance between a conducting nozzle and the welding line is 2mm, the distance between the conducting nozzle and the edge of the groove is 3mm, the diameter of a welding wire adopted during welding is 4mm, the welding current is 480-520A, the voltage is 30-33V, the tire rotating speed and the welding speed are 420-470mm/min, the interlayer temperature is not higher than 150 ℃, the welding is stopped immediately when the interlayer temperature is higher than 150 ℃, and the welding is performed when the interlayer temperature is reduced to below 50 ℃; the U-shaped groove cover layer is welded in multiple ways, the width of each welding line is smaller than 20mm, and before welding, the U-shaped groove cover layer can be welded after the interlayer temperature is reduced to room temperature.
S4: and (3) the pile body end socket (3) is placed down to be in butt joint with the lower pile body, and after the pile body end socket is in butt joint with the lower pile body, the bottom welding, the V-shaped groove welding and the U-shaped groove welding are sequentially carried out, wherein the bottom welding method is the same as that of the step S2, and the V-shaped groove welding and the U-shaped groove welding are the same as that of the step S3.
In the construction method applicable to the welding line of the reactor body of the nuclear power station, in the step S2, when argon arc welding is used, the rising time is 5 seconds, and air is supplied in advance for 3 seconds; the decay time is 3 seconds, the decay current is 20A, and the gas is slowly stopped for 5 seconds; argon is used for protecting the back surface of the welding seam, and the flow rate of the argon is 10-15L/min.
In the construction method applicable to the welding seam of the reactor body of the nuclear power station, in the step S2, when the empty hole is smaller than 3mm, welding wires are not needed, when the empty hole is 3-5mm, welding wires of 2-3mm are added, and when the empty hole is larger than 5mm, welding wires of 3-5mm are added.
In the construction method applicable to the welding seam of the reactor body of the nuclear power station, in the step S2, the lower-stage reactor body is erected on a stainless steel platform, and then the upper-stage reactor body is hung above the lower-stage reactor body by using a special stainless steel hanging belt, and the upper-stage reactor body is in butt joint with the lower-stage reactor body.
In the construction method applicable to the welding seam of the reactor body of the nuclear power station, in the step S3, when the front two layers of welding seams of the V-shaped groove are welded manually, the back surface of the welding seam is protected by argon.
In the construction method applicable to the welding seam of the reactor body of the nuclear power station, in step S3, the two sides of the groove are smeared with the anti-splashing liquid for protection before welding.
The construction method for the welding seam of the reactor body of the nuclear power station is further characterized in that in step S3, welding slag is cleaned at any time in the welding process, and whether defects such as undercut exist or not is checked.
In the construction method applicable to the welding seam of the reactor body of the nuclear power station, in the step S3, the arc receiving point and the arc starting point are staggered by not less than 100mm during welding of the U-shaped groove.
The construction method suitable for the welding seam of the reactor body of the nuclear power station is further characterized in that the reactor body end enclosure in the step S4 is horizontally placed on a fixture tire, and the reactor body end enclosure is placed down to be in butt joint with the lower-section reactor body through the fixture tire.
The construction method suitable for the welding seam of the reactor body of the nuclear power station is further characterized in that the misalignment amounts of the upper-section reactor body and the lower-section reactor body and the misalignment amounts of the lower-section reactor body and the reactor body seal head are all smaller than 0.5mm, and the assembly gap is 0-1mm.
1. The manufacturing and processing precision of the pile body can be fully ensured:
by adopting the construction method, the groove of the pile weld joint is finished in a mechanical processing mode, and the processing precision of the groove can be fully ensured. In addition, due to the adoption of a special V+U-shaped groove and a groove form with a narrow gap, the filling amount of the groove is small, the gap is not required to be reserved in the assembly process, the assembly difficulty is reduced, and due to the fact that the gap is not reserved, the welding shrinkage is greatly reduced, and the welding shrinkage and the deformation are 2-3mm smaller than those of the conventional process method. Thereby better ensuring the precision of the pile body.
2. The welding quality is greatly improved:
the groove adopts a 2mm transition section and hole opening welding, so that the operation difficulty of single-sided welding and double-sided forming of the bottom layer priming is obviously reduced, and the penetration welding can be fully ensured. The inner side adopts a manual welding technology and the outer side adopts a U-shaped narrow gap welding technology, so that the welding heat input is small, and the corrosion resistance of the welding seam can be obviously improved. The single-sided welding and double-sided forming technology is adopted, so that the links such as gouging and back chipping can be avoided, and the corrosion capacity reduction caused by carbon and overheating is reduced.
3. The production efficiency can be greatly improved:
(1) The upper section and the lower section of the pile body adopted by the process method are assembled vertically without gaps, the assembly is simple, the assembly precision is high, and only 1/3 of the horizontal assembly is needed;
(2) The special V+U groove design adopted by the process method has high bottom layer welding speed which is 2-5 times of that of single-sided welding double-sided forming with a gap and 2-3 times of that of gouging and back chipping.
(3) The narrow gap welding groove type adopted by the process method has smaller included angle than the conventional groove, and small welding filling quantity, and compared with the conventional double-U-shaped single-sided welding double-sided forming groove type, the production cycle can be shortened by about 20%;
(4) By adopting the process method, the welding effect of single-sided welding and double-sided one-step forming can be achieved, the back surface of the welding seam does not need to be gouged by gouging, the gouging and polishing procedures in the conventional welding construction are avoided, and the construction period is shortened by 50%.
4. The production cost can be greatly reduced:
(1) Compared with other common bevel types, the narrow-gap welding bevel type adopted by the welding process method can reduce the filling quantity of welding materials by more than 10 percent, and obviously reduce the welding cost;
(2) By adopting the welding process method, one-sided welding and two-sided one-step forming can be realized, working procedures such as gouging, back chipping and the like, polishing consumable materials, kinetic energy and manpower are saved, and the construction cost is remarkably reduced.
5. The pollution is obviously reduced, and the labor environment of welders is improved:
by adopting the construction process method, gouging, back chipping and polishing operations can be avoided, environmental damage caused by noise, gouging smoke dust and the like and corrosion of carbon to stainless steel can be avoided, meanwhile, the operation environment of welding constructors can be improved, the workload harmful to health can be reduced, and the labor intensity can be reduced;
6. the application range is wide: the welding line groove form and the construction method can be applied to the construction of welding lines of reactor bodies of nuclear power stations, the welding of all stainless steel thick-wall pressure containers and the girth welding of other steel thick-wall pressure containers, and the construction such as the splicing welding of thick plates in common steel structure products can be performed in a referencing manner.
Drawings
FIG. 1 is a schematic view of a nuclear power plant reactor;
FIG. 2 is a schematic view of a V+U-shaped narrow groove structure of a nuclear power plant reactor body;
FIG. 3 is a schematic diagram of a stack welding operation;
FIG. 4 is a schematic diagram of the operation of a submerged arc welder for narrow gap welding;
wherein: 1-upper segment pile body, 2-lower segment pile body, 3-pile body end socket, 4-weld joint, 6-welding wire, 7-submerged arc welding machine, 8-welding agent and 9-rotating tire.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in FIG. 1, the reactor body (hereinafter referred to as the reactor body) is provided with an upper-stage reactor body, a lower-stage reactor body and a reactor body seal head, a weld joint is formed between the upper-stage reactor body and the lower-stage reactor body, the weld joint is formed between the lower-stage reactor body and the reactor body seal head, the welding is carried out in sections, and the reactor body is welded by adopting the following welding steps:
step 1: as shown in fig. 2, the welding seams of the reactor body are v+u-shaped narrow gap grooves, and the grooves of the reactor body are machined into: the angle of the V-shaped groove is 25+/-2.5 degrees, the angle of the U-shaped groove is 5 degrees, the radius of the U-shaped root is 6-8mm, a 2 x 2mm transition section is adopted between the V-shaped groove and the U-shaped groove, and the depth of the V-shaped groove is 20-30mm. And cleaning the processed U-shaped groove, V-shaped groove, oxide and other dirt within the range of 20mm, and polishing to leak metallic luster by using a special polishing machine for stainless steel.
Step 2: and (3) hoisting and butting the polished upper section pile body with the lower section pile body by using a special stainless steel sling, erecting the lower section pile body on a stainless steel platform, hoisting the upper section pile body above the lower section pile body, butting the upper section pile body with the lower section pile body, wherein the misalignment amount of the upper section pile body and the lower section pile body is less than 0.5mm, and the assembly gap is 0-1mm. And detecting the assembled pile body, and performing backing layer welding on the inner side of the pile body by using argon arc welding after confirmation, and filling argon for protection on the outer side to realize single-sided welding and double-sided molding.
The argon arc welding adopts positioning welding to weld the bottom layer to form 50-70mm long nail welding points, every two nail welding points are 300mm apart, and then adopts a symmetrical back welding method to weld the welding seam. The welding wire with the diameter of 2.0mm is adopted, the current is 150-170A during welding, the arc striking current is 20A, the rising time is 5 seconds, air is supplied for 3 seconds in advance, the decay time is 3 seconds, the decay current is 20A, air is slowly stopped for 5 seconds, argon is adopted for protecting the back surface of the welding seam, the flow of argon is 10-15L/min, the electric arc is stopped in situ for preheating after the arc striking, circular swing is carried out, so that the base metal is melted, a cavity with the diameter of 3-5mm is formed, the welding wire is placed in front of the cavity at the moment, the included angle between the welding gun and the welding seam is 85-90 degrees, the deepest penetration can be ensured, and meanwhile, the electric arc is uniformly heated for the base metal at two sides. Double-layer welding is carried out in a mode that the height of the arc is 3-4mm, so that heat concentration and a minimum molten pool are guaranteed, the cooling speed is high, the welding seam is attractive in appearance, the heat affected zone is small, and the performance is good. And after the bottom layer is welded, filling a layer by adopting the same welding method, wherein the thickness of the formed welding seam is more than 5mm. In the argon arc welding process, the welding wire cannot leave the protection of argon, the wire feeding is stable and uniform, and the wire feeding is prevented from disturbing the shielding gas too fast to enable the welding seam to generate air holes.
During welding, arc is transported according to the size of the cavity, the welding wire is continuously moved forwards, the amount of the welding wire is determined according to the size of the cavity, when the cavity is smaller than 3mm, the welding wire is not needed, when the cavity is 3-5mm, the welding wire is added by 2-3mm, when the cavity is larger than 5mm, the welding wire is added by 3-5 mm. When welding, oxide skin appears on the welding bead, which indicates that the argon protection is poor, and the argon flow needs to be readjusted to make the welded welding bead silvery white or golden yellow.
Step 3: after the welding of the bottom layers of the upper-section pile body and the lower-section pile body is finished, the two-section pile body is laid down on the rotating tire for subsequent welding, and splash-proof liquid is smeared on two sides of the groove for protection before welding. During welding, a manual welding rod with the diameter of 3.2mm, the current of 90-110A or the diameter of 4.0mm and the current of 140-160A is adopted for welding, a V-shaped groove adopts multi-layer multi-pass welding, the width of each welding seam is smaller than 3 times the diameter of the welding rod, the interlayer temperature is smaller than 150 DEG, the V-shaped groove is covered by a surface layer, the inter-channel temperature is smaller than 100 DEG by adopting a low-current linear rapid welding method, the concave-convex degree between a welding bead and a welding bead is smaller than 1mm, and the back surface of the V-shaped groove is protected by argon. Cleaning splashes and dirt on the surface of the welded channel after welding, checking whether the defects such as undercut exist, and the like, so as to ensure that the technical requirements are met.
As shown in fig. 3, the U-shaped groove is welded by a cross arm type submerged arc welding machine (hereinafter referred to as submerged arc welding machine), the contact tip is a special narrow gap contact tip, the contact tip shown in patent No. 201420802983.6 is used for construction, the submerged arc welding machine is perpendicular to the welding line, the height of the contact tip from the welding line is 2mm, the contact tip is ensured to have a distance of 3mm from the edge of the groove, the contact tip and the groove are easy to be short-circuited due to the fact that the groove is too close, copper increasing phenomenon is caused to the groove, welding line cracks are possibly caused, and meanwhile welding failure is possibly caused. And (3) putting special flux into the groove, and starting welding after the rotating tire speed and the welding speed are 420-470 mm/min. The diameter of the welding wire adopted during welding is 4mm, the welding current is 480-520A, the voltage is 30-33V, the interlayer temperature is not higher than 150 ℃, the welding is stopped immediately when the interlayer temperature is higher than 150 ℃, the welding is performed when the interlayer temperature is reduced to below 50 ℃, and welding slag is cleaned at any time during the welding process. The U-shaped groove cover layer is welded in multiple ways, the width of each welding line is smaller than 20mm, before the U-shaped groove cover layer is welded, the welding can be performed after the interlayer temperature is reduced to the room temperature, and the arc collecting point and the arc starting point are staggered to be not smaller than 100mm during welding.
After 24 hours from the end of welding, 100% nondestructive testing (ray/ultrasonic/permeation) is carried out on the welding seam, so that the internal quality of the welding seam is ensured to meet the product quality requirement. And checking the welding line, and turning to the next procedure after confirming that no standard exceeding defect exists.
Step 4: as shown in fig. 4, the pile end enclosure is placed down to be in butt joint with the lower pile, and is placed down to be in butt joint with the lower pile through the fixture tire. And after the pile end socket is in butt joint with the lower pile, sequentially performing bottom welding, V-shaped groove welding and U-shaped groove welding, wherein the bottom welding method is the same as that in the step S2, and the V-shaped groove welding and the U-shaped groove welding are the same as that in the step S3.
The invention is mainly suitable for welding the reactor body of the nuclear power station, ensures the manufacturing and processing precision of the reactor body to be fully ensured, greatly improves the welding quality and the production efficiency, reduces the production cost, obviously reduces pollution, improves the labor environment of welders and has wide application range.
Claims (10)
1. A construction method suitable for a welding line of a reactor body of a nuclear power station is characterized by comprising the following steps: the method comprises the following steps:
s1: the welding lines of the reactor body are V+U-shaped narrow gap grooves, the angle of each V-shaped groove is 25+/-2.5 degrees, the angle of each U-shaped groove is 5 degrees, the radius of each U-shaped root is 6-8mm, 2 x 2mm transition sections are adopted between each V-shaped groove and each U-shaped groove, and the depth of each V-shaped groove is 20-30mm; the method comprises the steps of (1) cleaning up the processed U-shaped groove and V-shaped groove with oxides and other dirt within the range of 20mm by using a special stainless steel grinding machine, and grinding to leak out metallic luster;
s2, vertically butting the polished upper section pile body (1) and the polished lower section pile body (2), welding a bottom layer by using argon arc welding, welding the bottom layer by adopting positioning welding to form 50-70mm nail welding points, spacing 300mm between every two nail welding points, and then welding a welding seam by adopting a symmetrical back welding method; after the argon arc welding is started, the electric arc is utilized to melt the base metal and form a cavity of 3-5mm, the double-pass welding is carried out in a mode that the included angle between a welding gun and a welding line is 85-90 degrees and the electric arc height is 3-4mm, and finally the welding line with the thickness of more than 5mm is formed; the diameter of a welding wire adopted by argon arc welding is 2.0mm, the welding current is 150-170A, and the arc striking current is 20A;
s3: after the bottom layers of the upper-section pile body (1) and the lower-section pile body (2) are welded, the two-section pile body is placed on a rotating tire (9) for subsequent welding, a manual welding rod with the diameter of 3.2mm, the current of 90-110A or the diameter of 4.0mm and the current of 140-160A is used for welding, a V-shaped groove is welded in a multi-layer way manner, the width of each welding line is smaller than 3 times the diameter of the welding rod, the interlayer temperature is smaller than 150 degrees, the V-shaped groove cover layer is welded in a small-current straight line rapid welding manner, the inter-channel temperature is smaller than 100 degrees, and the concave-convex degree between welding lines is smaller than 1mm;
the U-shaped groove is welded by a cross arm type submerged arc welding machine, the submerged arc welding machine is perpendicular to the welding line, the height of the conducting nozzle from the welding line is 2mm, the distance between the conducting nozzle and the edge of the groove is 3mm, the diameter of a welding wire adopted during welding is 4mm, the welding current is 480-520A, the voltage is 30-33V, the tire rotating speed and the welding speed are 420-470mm/min, the interlayer temperature is not higher than 150 ℃, the welding is immediately stopped when the interlayer temperature is higher than 150 ℃, and the welding is performed when the interlayer temperature is reduced to be lower than 50 ℃; the U-shaped groove cover layer is welded in multiple ways, the width of each welding line is smaller than 20mm, and before welding, the U-shaped groove cover layer can be welded after the interlayer temperature is reduced to the room temperature;
s4: and (3) the pile body end socket (3) is placed down to be in butt joint with the lower pile body, and after the pile body end socket is in butt joint with the lower pile body, the bottom welding, the V-shaped groove welding and the U-shaped groove welding are sequentially carried out, wherein the bottom welding method is the same as that of the step S2, and the V-shaped groove welding and the U-shaped groove welding are the same as that of the step S3.
2. The construction method for a welding line of a reactor body of a nuclear power station according to claim 1, wherein: in the step S2, when argon arc welding is used, the rising time is 5 seconds, and air is supplied in advance for 3 seconds; the decay time is 3 seconds, the decay current is 20A, and the gas is slowly stopped for 5 seconds; argon is used for protecting the back surface of the welding seam, and the flow rate of the argon is 10-15L/min.
3. The construction method for a welding line of a reactor body of a nuclear power station according to claim 1, wherein: in the step S2, when the empty hole is smaller than 3mm, welding wires are not needed, when the empty hole is 3-5mm, welding wires of 2-3mm are added, and when the empty hole is larger than 5mm, welding wires of 3-5mm are added.
4. The construction method for a welding line of a reactor body of a nuclear power station according to claim 1, wherein: in the step S2, the lower-stage pile body is erected on a stainless steel platform, and then the upper-stage pile body is hung above the lower-stage pile body by using a special stainless steel hanging belt, and the upper-stage pile body is in butt joint with the lower-stage pile body.
5. The construction method for a welding line of a reactor body of a nuclear power station according to claim 1, wherein: in the step S3, when the front two layers of welding seams of the V-shaped groove are welded manually, the back surface of the welding seams is protected by argon.
6. The construction method for a welding line of a reactor body of a nuclear power station according to claim 1, wherein: in step S3, anti-splashing liquid is smeared on two sides of the groove for protection before welding.
7. The construction method for a welding line of a reactor body of a nuclear power station according to claim 1, wherein: in step S3, welding slag is cleaned at any time in the welding process, and whether defects such as undercut exist or not is checked.
8. The construction method for a welding line of a reactor body of a nuclear power station according to claim 1, wherein: in the step S3, when the U-shaped groove is welded, the arc collecting point and the arc starting point are staggered by not less than 100mm.
9. The construction method for a welding line of a reactor body of a nuclear power station according to claim 1, wherein: and S4, horizontally placing the pile end enclosure on the tooling tire, and placing the pile end enclosure down to be in butt joint with the lower pile through the tooling tire.
10. A construction method for a weld joint of a reactor body of a nuclear power plant according to claim 1 or 4, characterized in that: the misalignment amount of the upper section pile body and the lower section pile body and the misalignment amount of the lower section pile body and the pile body end socket are all smaller than 0.5mm, and the assembly gap is 0-1mm.
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