CN114951902A - Construction method suitable for nuclear power station reactor body welding seam - Google Patents
Construction method suitable for nuclear power station reactor body welding seam Download PDFInfo
- Publication number
- CN114951902A CN114951902A CN202210452669.9A CN202210452669A CN114951902A CN 114951902 A CN114951902 A CN 114951902A CN 202210452669 A CN202210452669 A CN 202210452669A CN 114951902 A CN114951902 A CN 114951902A
- Authority
- CN
- China
- Prior art keywords
- welding
- shaped groove
- reactor
- stack
- reactor body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003466 welding Methods 0.000 title claims abstract description 279
- 238000010276 construction Methods 0.000 title claims abstract description 40
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 43
- 229910052786 argon Inorganic materials 0.000 claims abstract description 28
- 230000007704 transition Effects 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 13
- 239000010935 stainless steel Substances 0.000 claims description 13
- 239000011229 interlayer Substances 0.000 claims description 12
- 239000002344 surface layer Substances 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- 238000010891 electric arc Methods 0.000 claims description 7
- 210000001503 joint Anatomy 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 claims description 4
- 239000010953 base metal Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 5
- 238000005498 polishing Methods 0.000 description 5
- 230000037452 priming Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- FFRBMBIXVSCUFS-UHFFFAOYSA-N 2,4-dinitro-1-naphthol Chemical compound C1=CC=C2C(O)=C([N+]([O-])=O)C=C([N+]([O-])=O)C2=C1 FFRBMBIXVSCUFS-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
A construction method suitable for a nuclear power station reactor body welding line is characterized in that the welding line of a reactor body (hereinafter referred to as a reactor body) adopts a V + U-shaped narrow gap groove, 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 a U-shaped root part 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 20-30 mm. And the upper section stack body and the lower section stack body are welded at the bottom layer by argon arc welding, and then the inner side welding and the outer side welding are sequentially carried out after the bottom layer is welded. The bottom layer welding adopts a positioning welding method and a 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 reactor of the nuclear power station, ensures that the manufacturing and processing precision of the reactor body can be fully ensured, greatly improves the welding quality and the production efficiency, reduces the production cost, obviously reduces the 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 reactor body welding line of a nuclear power station reactor.
Background
For the reactor body welding construction of the thick-wall nuclear power station reactor, the current better technical mode is to machine and process a U + V-shaped (outer U-shaped with an included angle of 20 degrees, inner V-shaped with an included angle of 60 degrees) groove, use a stainless steel priming special flux-cored wire to carry out priming welding, and after the priming is qualified through inspection, a constructor carries out cover surface welding. By adopting the operation mode, the quality problems of high-speed welding seam carburization and the like caused by the conventional one-side welding, back-side gouging back gouging and polishing operation mode and the personal injury brought to constructors caused by polishing noise, dust and the like can be effectively avoided.
However, in order to ensure the welding effect of one-time forming of single-side welding and double-side welding, the welding process method is adopted, when the thick-wall stainless steel cylinder section is assembled, a certain circumferential gap is always required to be reserved, a tool fixture is used for fixing the position of the thick-wall stainless steel cylinder section, meanwhile, when a welder performs bottom welding on the inner side, the outer side is protected by welding with argon, and after the welding construction is finished, the fixing tool and the fixture are manually disassembled. Factors such as constructor quality, assembly clearance control, product precision can all cause the influence of different degree to welding quality, often can appear the unstable condition of welding quality. Meanwhile, the assembly group also increases a lot of construction cost for construction, installation/removal of tool fixtures and the like, and the construction efficiency and quality are seriously affected.
Disclosure of Invention
In order to solve the problems, the invention provides a construction method suitable for a reactor body welding seam of a nuclear power station reactor, aiming at achieving the purposes of reducing welding difficulty and improving welding efficiency and quality, and the adopted technical scheme is as follows:
a construction method suitable for a reactor body welding seam of a nuclear power station reactor 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 20-30 mm; and cleaning the processed U-shaped groove and V-shaped groove with oxides and other dirt within 20mm by using a special stainless steel grinding machine, and grinding the leaked metal luster. 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 segment stack body (1) and the lower segment stack body (2) up and down, welding a bottom layer by using argon arc welding, firstly adopting positioning welding to form nail welding points with the length of 50-70mm by welding the bottom layer, and then adopting a symmetrical backing welding method to weld a welding line, wherein the interval between every two nail welding points is 300 mm; after starting the arc in argon arc welding, melting the base metal by using electric arc, forming a cavity with the thickness of 3-5mm, performing double-pass welding in a mode that the included angle between a welding gun and a welding line is 85-90 degrees and the height of the electric arc is 3-4mm, and finally forming the welding line with the thickness of more than 5 mm; 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 can not leave the protection of argon gas, the wire feeding is stable and uniform, and the phenomenon that the welding seam generates air holes due to the fact that the shielding gas is disturbed too fast in the wire feeding is prevented.
S3: after the welding of the bottom layers of the upper-section stack body (1) and the lower-section stack body (2) is finished, the two-section stack body is laid on a rotary tire (9) for subsequent welding, manual welding rods with the diameter of 3.2mm, the current of 90-110A or the diameter of 4.0mm and the current of 140-160A are adopted for welding, a V-shaped groove adopts multilayer multi-pass welding, the width of each welding line is less than 3 times the diameter of the welding rod, the interlayer temperature is less than 150 degrees, a V-shaped groove cover surface layer is adopted, a small-current linear rapid welding method is adopted, the inter-pass temperature is less than 100 degrees, and the roughness between the welding passes is less than 1 mm.
The U-shaped groove is welded by a cross arm type submerged arc welding machine (hereinafter referred to as a submerged arc welding machine), the submerged arc welding machine is vertical to the welding line, the height of a conductive nozzle from the welding line is 2mm, the distance between the conductive 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 both 420-470mm/min, the interlayer temperature is not higher than 150 ℃, the welding is stopped immediately when the temperature is higher than 150 ℃, and the welding is carried out when the interlayer temperature is reduced to below 50 ℃; the U-shaped groove cover surface layer adopts multi-pass welding, the width of each welding line is less than 20mm, and the U-shaped groove cover surface layer can be welded only after the interlayer temperature is reduced to the room temperature before welding.
S4: and (3) placing the stack body end enclosure (3) to be butted with the lower stack body, and after the stack body end enclosure is butted with the lower stack body, sequentially performing bottom welding, V-shaped groove welding and U-shaped groove welding, wherein the method for welding the bottom layer is the same as that in the step S2, and the method for welding the V-shaped groove and the U-shaped groove is the same as that in the step S3.
In the above construction method for the weld seam of the reactor body of the nuclear power plant, further, in step S2, when the argon arc welding is used, the rising time is 5 seconds, and the air is supplied for 3 seconds in advance; the decay time is 3 seconds, the decay current is 20A, and the air is slowly stopped for 5 seconds; the back of the welding seam is protected by argon, and the flow of the argon is 10-15L/min.
In the above construction method for the welding seam of the reactor body of the nuclear power station, further, in step S2, when the cavity is smaller than 3mm, no welding wire is needed to be added, when the cavity is 3-5mm, 2-3mm welding wire is added, and when the cavity is larger than 5mm, 3-5mm welding wire is added.
In step S2, the lower segment of the reactor body is erected on a stainless steel platform, and then the upper segment of the reactor body is suspended above the lower segment of the reactor body by using a stainless steel-dedicated suspension strap, and the upper segment of the reactor body is in butt joint with the lower segment of the reactor body.
In the above construction method for a weld of a reactor body of a nuclear power plant reactor, further, in step S3, when the front two layers of welds of the V-groove are welded manually, the back of the welds are protected by argon gas.
In the above construction method suitable for the reactor body weld of the nuclear power station reactor, further, in step S3, anti-spatter liquid is applied to both sides of the groove for protection before welding.
In the above construction method for the weld joint of the reactor body of the nuclear power plant, further, in step S3, the welding slag is cleaned at any time during the welding process, and whether the defects such as undercut exist is checked.
In the above construction method for a weld of a reactor body of a nuclear power plant reactor, further, in step S3, when welding a U-shaped groove, the arc ending point and the arc starting point need to be staggered by not less than 100 mm.
In the above construction method suitable for the welding seam of the reactor body of the nuclear power station, further, the reactor body end socket in the step S4 is flatly placed on the tooling tire, and the reactor body end socket is laid down by the tooling tire to be butted with the lower reactor body.
The construction method suitable for the nuclear power station reactor body welding seam is further characterized in that the misalignment amount of the upper section reactor body and the lower section reactor body and the misalignment amount of the lower section reactor body and the reactor body end socket are both smaller than 0.5mm, and the assembly clearance is 0-1 mm.
1. The manufacturing and processing precision of the stack body can be fully ensured:
by adopting the construction method, the groove of the pile body welding line is finished by adopting a mechanical processing mode, and the processing precision of the groove can be fully ensured. In addition, due to the adoption of the special V + U-shaped groove and narrow-gap groove form, the filling amount of the groove is small, no gap needs to be reserved in the assembling process, the assembling difficulty is reduced, the welding shrinkage is greatly reduced due to the absence of the gap, and the welding shrinkage and the deformation are 2-3mm smaller than those of the conventional process method. Thereby better ensuring the accuracy of the pile body.
2. The welding quality is greatly improved:
the groove adopts a 2mm transition section and is welded by opening holes, so that the operation difficulty of single-side welding and double-side forming of the bottom 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 line can be obviously improved. Because of adopting the single-side welding and double-side forming technology, links such as gouging back gouging and the like can be omitted, thereby reducing the reduction of corrosion capability caused by carbon and overheating.
3. The production efficiency can be greatly improved:
(1) the upper section of the stack body and the lower section of the stack body adopted by the process method are vertically assembled without gaps, the assembly is simple, the assembly precision is high, and the time is only 1/3 of horizontal assembly;
(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-side welding double-side forming with a gap and 2-3 times of that of gouging back gouging.
(3) The narrow gap welding groove type adopted by the process method has a groove included angle smaller than that of a conventional groove, and the welding filling amount is small, so that the production period can be shortened by about 20% compared with that of a conventional double-U-shaped single-side welding double-side forming groove type;
(4) the welding effect of single-side welding and double-side one-step forming can be achieved by adopting the process method, the back of the welding seam is not required to be gouged, the gouging and polishing procedures in the conventional welding construction are eliminated, and the construction period is shortened by 50%.
4. The production cost can be greatly reduced:
(1) compared with other common groove types, the narrow gap welding groove type adopted by the welding process method can reduce the filling amount of welding materials by more than 10 percent, and obviously reduce the welding cost;
(2) by adopting the welding process method, one-time forming of single-side welding and double-side welding can be realized, working procedures such as gouging, back chipping and the like, polishing consumables, kinetic energy and manpower are saved, and the construction cost is obviously reduced.
5. Obviously reduce pollution and improve the labor environment of welders:
by adopting the construction process method, gouging and polishing operations can be avoided, damage to the environment and corrosion of carbon to stainless steel caused by noise, gouging smoke dust and the like can be avoided, meanwhile, the operation environment of welding construction personnel can be improved, the workload harmful to health is reduced, and the labor intensity is reduced;
6. the application range is wide: the welding seam groove form and the construction method can be applied to the construction of the welding seam of the reactor body of the nuclear power station reactor, the welding of all stainless steel thick-wall pressure containers and the girth welding of other steel thick-wall pressure containers, and meanwhile, the construction such as thick plate splicing welding in common steel structure products can also be executed according to the reference.
Drawings
FIG. 1 is a schematic diagram of a nuclear power plant reactor body;
FIG. 2 is a schematic diagram of a V + U-shaped narrow groove structure of a reactor body of a nuclear power plant reactor;
FIG. 3 is a schematic view of a stack welding operation;
FIG. 4 is a schematic view of a submerged arc welding machine for narrow gap welding;
wherein: 1-upper segment stacking body, 2-lower segment stacking body, 3-stacking body end enclosure, 4-welding seam, 6-welding wire, 7-submerged arc welding machine, 8-welding flux and 9-rotary tire.
Detailed Description
The invention is further explained with reference to the drawings.
A construction method suitable for a nuclear power station reactor body welding line is disclosed, as shown in figure 1, a reactor body (hereinafter referred to as a reactor body) is provided with an upper section of the reactor body, a lower section of the reactor body and a reactor body end enclosure, welding lines are formed between the upper section of the reactor body and the lower section of the reactor body and between the lower section of the reactor body and the reactor body end enclosure, the welding lines are welded in sections, and the reactor body is welded by adopting the following welding steps:
step 1: as shown in fig. 2, the weld seams of the reactor body all adopt V + U type narrow gap grooves, and the reactor body grooves are machined by a machine 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 root part of the U-shaped groove 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 20-30 mm. And cleaning the processed U-shaped groove and V-shaped groove with oxides and other dirt within 20mm by using a special stainless steel grinding machine, and grinding the leaked metal luster.
Step 2: and (3) hoisting and butting the polished upper section stack body with the lower section stack body by using a special stainless steel sling, wherein the lower section stack body is erected on a stainless steel platform, then hoisting the upper section stack body to the upper part of the lower section stack body, butting the upper section stack body with the lower section stack body, and the misalignment amount of the upper section stack body and the lower section stack body is less than 0.5mm, and the assembling clearance is 0-1 mm. And detecting the assembled stack body, welding the inner side of the stack body by argon arc welding after confirmation, and filling argon to protect the outer side of the stack body so as to realize single-side welding and double-side forming.
Argon arc welding firstly adopts positioning welding to carry out bottom layer welding to form nail welding points with the length of 50-70mm, every two nail welding points are spaced by 300mm, and then a symmetrical back welding method is adopted to carry out welding on a welding line. 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, the gas is fed in advance for 3 seconds, the attenuation time is 3 seconds, the attenuation current is 20A, the gas is stopped slowly for 5 seconds, the argon protection is adopted on the back of the welding seam, the argon flow is 10-15L/min, the electric arc is stopped in situ for preheating after the arc is started, circular swing is carried out, the welding wire is placed in front of the cavity, the included angle between the welding gun and the welding seam is 85-90 degrees, the deepest melting depth can be ensured, and meanwhile, the electric arc uniformly heats the base metals on the two sides. The double-layer welding is carried out in a mode that the height of the electric arc is 3-4mm, so that the heat concentration and the minimum molten pool are ensured, 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 welding is finished, filling a layer by adopting the same welding method, wherein the thickness of the formed welding line is more than 5 mm. In the argon arc welding process, the welding wire can not leave the protection of argon gas, the wire feeding is stable and uniform, and the phenomenon that the welding seam generates air holes due to the fact that the shielding gas is disturbed too fast in the wire feeding is prevented.
During welding, arc is moved forward continuously according to the size of the cavity, 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 to be added, when the cavity is 3-5mm, the welding wire with the length of 2-3mm is added, and when the cavity is larger than 5mm, the welding wire with the length of 3-5mm is added. And oxide skin appears on the welding bead during welding, which indicates that the argon protection is poor, and the argon flow needs to be readjusted to ensure that the welded joint is silvery white or golden yellow.
And step 3: and after the welding of the bottom layers of the upper stack and the lower stack is finished, the two stacks are laid on a rotating tire for subsequent welding, and anti-splashing liquid is coated on the two sides of the groove for protection before welding. During welding, manual welding rods with the diameter of 3.2mm, the current of 90-110A or the diameter of 4.0mm and the current of 140-160A are adopted for welding, multiple layers and multiple channels are adopted for the V-shaped groove, the width of each welding line is less than 3 times of the diameter of the welding rod, the interlayer temperature is less than 150 degrees, the covering surface layer of the V-shaped groove adopts a low-current linear rapid welding method, the inter-channel temperature is less than 100 degrees, the roughness between welding beads is less than 1mm, and the back surface of the V-shaped groove is protected by argon. And (4) cleaning splashes and dirt on the surface of the welding track after welding, checking whether the defects such as undercut exist, and ensuring that the technical requirements are met.
As shown in fig. 3, a U-shaped groove is welded by using a cross-arm submerged arc welding machine (hereinafter referred to as a submerged arc welding machine), a special narrow-gap contact tip is used as a contact tip, the contact tip shown in patent No. 201420802983.6 is used for construction, the submerged arc welding machine is perpendicular to a welding seam, the height of the contact tip from the welding seam is 2mm, the contact tip is ensured to be 3mm away from the edge of the groove, the contact tip and the groove are easily short-circuited too close to each other, the groove is subjected to a copper increase phenomenon, and the welding seam is possibly cracked and cannot be welded. Special welding flux is put into the groove, and welding is started after the tire rotating speed and the welding speed are both 420-. The diameter of a 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 stopped 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 surface layer adopts multi-pass welding, the width of each welding line is smaller than 20mm, the U-shaped groove cover surface layer can be welded before welding after the temperature between layers is reduced to room temperature, and the arc-receiving point and the arc-starting point are staggered by not less than 100mm during welding.
And after the welding is finished for 24 hours, performing 100% nondestructive testing (ray/ultrasonic/permeation) on the welding seam, and ensuring that the internal quality of the welding seam meets the product quality requirement. And (5) inspecting the welding seam, and turning to the next procedure after confirming that the standard exceeding defect does not exist.
And 4, step 4: as shown in fig. 4, the stack seal head is laid down to be in butt joint with the lower stack, and the stack seal head is laid down to be in butt joint with the lower stack through the tooling tire. And (4) after the stack body end socket is in butt joint with the lower stack body, sequentially performing bottom layer welding, V-groove welding and U-groove welding, wherein the method for bottom layer welding is the same as that in the step S2, and the method for V-groove welding and the U-groove welding are the same as that in the step S3.
The invention is mainly suitable for welding the reactor body of the reactor of the nuclear power station, ensures that the manufacturing and processing precision of the reactor body can be fully ensured, greatly improves the welding quality and the production efficiency, reduces the production cost, obviously reduces the pollution, improves the labor environment of welders and has wide application range.
Claims (10)
1. A construction method suitable for a reactor body welding seam of a nuclear power station reactor is characterized by comprising the following steps: 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 20-30 mm; cleaning the processed U-shaped groove and V-shaped groove with oxides and other dirt within 20mm by using a stainless steel special grinding machine and grinding leaked metal luster;
s2, vertically butting the polished upper segment stack body (1) and the lower segment stack body (2) up and down, welding a bottom layer by using argon arc welding, firstly adopting positioning welding to form nail welding points with the length of 50-70mm by welding the bottom layer, and then adopting a symmetrical backing welding method to weld a welding line, wherein the interval between every two nail welding points is 300 mm; after starting the arc in argon arc welding, melting the base metal by using electric arc, forming a cavity with the thickness of 3-5mm, performing double-pass welding in a mode that the included angle between a welding gun and a welding line is 85-90 degrees and the height of the electric arc is 3-4mm, and finally forming the welding line with the thickness of more than 5 mm; 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 welding of the bottom layers of the upper-section stacking body (1) and the lower-section stacking body (2) is finished, the two-section stacking body is laid on a rotary tire (9) for subsequent welding, manual welding rods with the diameter of 3.2mm, the current of 90-110A or the diameter of 4.0mm and the current of 140-160A are adopted for welding, a V-shaped groove adopts multilayer multi-pass welding, the width of each welding line is less than 3 times the diameter of the welding rod, the interlayer temperature is less than 150 degrees, a V-shaped groove cover surface layer is adopted, a small-current linear rapid welding method is adopted, the inter-pass temperature is less than 100 degrees, and the roughness between the welding pass and the welding pass is less than 1 mm;
the U-shaped groove is welded by a cross arm type submerged arc welding machine (hereinafter referred to as a submerged arc welding machine), the submerged arc welding machine is vertical to the welding line, the height of a conductive nozzle from the welding line is 2mm, the distance between the conductive 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 both 420-470mm/min, the interlayer temperature is not higher than 150 ℃, the welding is stopped immediately when the temperature is higher than 150 ℃, and the welding is carried out when the interlayer temperature is reduced to below 50 ℃; the U-shaped groove cover surface layer adopts multi-pass welding, the width of each welding line is less than 20mm, and the U-shaped groove cover surface layer can be welded only after the interlayer temperature is reduced to room temperature before welding;
s4: and (3) placing the stack body end enclosure (3) to be butted with the lower stack body, and after the stack body end enclosure is butted with the lower stack body, sequentially performing bottom welding, V-shaped groove welding and U-shaped groove welding, wherein the method for welding the bottom layer is the same as that in the step S2, and the method for welding the V-shaped groove and the U-shaped groove is the same as that in the step S3.
2. The construction method suitable for the welding seam of the reactor body of the nuclear power station reactor as claimed in claim 1, wherein: in step S2, when argon arc welding is used, the rising time is 5 seconds, and air is fed for 3 seconds in advance; the decay time is 3 seconds, the decay current is 20A, and the air is slowly stopped for 5 seconds; the back of the welding seam is protected by argon, and the flow of the argon is 10-15L/min.
3. The construction method suitable for the welding seam of the reactor body of the nuclear power station reactor as claimed in claim 1, wherein: in step S2, when the hole is smaller than 3mm, no welding wire is needed to be added, when the hole is 3-5mm, 2-3mm welding wire is added, and when the hole is larger than 5mm, 3-5mm welding wire is added.
4. The construction method suitable for the welding seam of the reactor body of the nuclear power station reactor as claimed in claim 1, wherein: in step S2, the lower segment of the stack is erected on a stainless steel platform, and then the upper segment of the stack is hung above the lower segment of the stack by using a stainless steel special hanging strip, and the upper segment of the stack is butted with the lower segment of the stack.
5. The construction method suitable for the welding seam of the reactor body of the nuclear power station reactor as claimed in claim 1, wherein: in step S3, when the front two layers of welds of the V-groove are welded manually, the back of the welds are protected by argon gas.
6. The construction method suitable for the welding seam of the reactor body of the nuclear power station reactor as claimed in claim 1, wherein: in step S3, before welding, anti-spatter liquid is applied to both sides of the groove for protection.
7. The construction method suitable for the welding seam of the reactor body of the nuclear power station reactor as claimed in claim 1, wherein: in step S3, the welding slag is cleaned at any time during the welding process, and whether there is a defect such as undercut is checked.
8. The construction method suitable for the welding seam of the reactor body of the nuclear power station reactor as claimed in claim 1, wherein: in step S3, when the U-shaped groove is welded, the arc ending point and the arc starting point need to be staggered by not less than 100 mm.
9. The construction method suitable for the welding seam of the reactor body of the nuclear power station reactor as claimed in claim 1, wherein: and (5) flatly placing the stack end enclosure in the step (S4) on the tooling tire, and putting the stack end enclosure down through the tooling tire to be in butt joint with the lower stack.
10. The construction method suitable for the welding seam of the reactor body of the nuclear power plant as claimed in claim 1 or 4, wherein: the misalignment amount of the upper section stack body and the lower section stack body and the misalignment amount of the lower section stack body and the stack body end enclosure are both less than 0.5mm, and the assembly clearance is 0-1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210452669.9A CN114951902B (en) | 2022-04-27 | 2022-04-27 | Construction method suitable for welding seam of reactor body of nuclear power station reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210452669.9A CN114951902B (en) | 2022-04-27 | 2022-04-27 | Construction method suitable for welding seam of reactor body of nuclear power station reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114951902A true CN114951902A (en) | 2022-08-30 |
| CN114951902B CN114951902B (en) | 2023-11-17 |
Family
ID=82979528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210452669.9A Active CN114951902B (en) | 2022-04-27 | 2022-04-27 | Construction method suitable for welding seam of reactor body of nuclear power station reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114951902B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006198657A (en) * | 2005-01-21 | 2006-08-03 | Hitachi Ltd | Method of multi-layer welding, and structure formed by multi-layer welding |
| CN101112739A (en) * | 2007-08-31 | 2008-01-30 | 北京工业大学 | P92 steel all position welding gas-protection flux-cored wire |
| CN101804492A (en) * | 2010-03-16 | 2010-08-18 | 上海电气电站设备有限公司 | Filler wire automatic welding method for welding nuclear-level heat-exchange tube and tube sheet |
| CN102179609A (en) * | 2011-05-17 | 2011-09-14 | 烟台台海玛努尔核电设备股份有限公司 | Submerged automatic arc welding process for nuclear power main pipeline |
| CN202539883U (en) * | 2011-12-23 | 2012-11-21 | 大连船舶重工集团有限公司 | A welding training assessment platform integrating overturning and elevating functions |
| WO2014173060A1 (en) * | 2013-04-26 | 2014-10-30 | 中国化学工程第三建设有限公司 | Assembly welding method for stainless steel weldment and pad |
| CN105665897A (en) * | 2016-03-24 | 2016-06-15 | 鲁西工业装备有限公司 | Duplex stainless steel submerged arc automatic welding method and application thereof |
| CN107598342A (en) * | 2017-11-08 | 2018-01-19 | 东方电气集团东方电机有限公司 | A kind of large-scale pumped storage power generator entirety doleiform axle welding manufacture method |
-
2022
- 2022-04-27 CN CN202210452669.9A patent/CN114951902B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006198657A (en) * | 2005-01-21 | 2006-08-03 | Hitachi Ltd | Method of multi-layer welding, and structure formed by multi-layer welding |
| CN101112739A (en) * | 2007-08-31 | 2008-01-30 | 北京工业大学 | P92 steel all position welding gas-protection flux-cored wire |
| CN101804492A (en) * | 2010-03-16 | 2010-08-18 | 上海电气电站设备有限公司 | Filler wire automatic welding method for welding nuclear-level heat-exchange tube and tube sheet |
| CN102179609A (en) * | 2011-05-17 | 2011-09-14 | 烟台台海玛努尔核电设备股份有限公司 | Submerged automatic arc welding process for nuclear power main pipeline |
| CN202539883U (en) * | 2011-12-23 | 2012-11-21 | 大连船舶重工集团有限公司 | A welding training assessment platform integrating overturning and elevating functions |
| WO2014173060A1 (en) * | 2013-04-26 | 2014-10-30 | 中国化学工程第三建设有限公司 | Assembly welding method for stainless steel weldment and pad |
| CN105665897A (en) * | 2016-03-24 | 2016-06-15 | 鲁西工业装备有限公司 | Duplex stainless steel submerged arc automatic welding method and application thereof |
| CN107598342A (en) * | 2017-11-08 | 2018-01-19 | 东方电气集团东方电机有限公司 | A kind of large-scale pumped storage power generator entirety doleiform axle welding manufacture method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114951902B (en) | 2023-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2258493B1 (en) | Welded steel pipe welded with a high energy density beam, and a manufacturing method therefor | |
| CN111069745B (en) | Welding method suitable for thick plate aluminum alloy | |
| CN112719515A (en) | Rail TIG welding method for black and white pipe | |
| CN105127566A (en) | Full penetration welding method of large-thickness carbon steel and stainless steel clad plate | |
| JPS6317554B2 (en) | ||
| CN112171029A (en) | Double-wire submerged-arc welding back-gouging-free welding method for boiler drum | |
| CN110961763B (en) | Method for welding bimetal composite pipe fitting and pipeline | |
| CN110421238A (en) | A kind of welding procedure of high intensity cylinder butt welding | |
| CN105618904A (en) | Narrow-gap submerged-arc welding groove structure of large thick-wall oil cylinder and assembling and welding method | |
| CN105750717A (en) | Welding process used for connecting plates and cylinder body | |
| CN113547190A (en) | Gas protection device and process method for welding TC4 titanium alloy plate | |
| CN101704162B (en) | Electroslag welding method for cylindrical longitudinal seam V groove | |
| CN112222580A (en) | Hot-rolled U rib double-side welding method | |
| CN112276307A (en) | Stellite alloy welding and heat treatment process for modular production | |
| CN114951902B (en) | Construction method suitable for welding seam of reactor body of nuclear power station reactor | |
| KR20120131592A (en) | Welding method for titanium pipe | |
| CN109024903B (en) | Hemispherical support joint and manufacturing process thereof | |
| CN114713938A (en) | Automatic priming process method for process pipeline robot | |
| CN111037063A (en) | Manual seamless deep-melting TIG (tungsten inert gas) welding process for SA-312TP304L stainless steel | |
| CN105171228A (en) | Welding technology method of motor train unit coupler seat assembly | |
| CN115041785B (en) | Manual TIG welding method based on low-alloy high-strength dissimilar steel gluing sleeve joint assembly | |
| CN111360408B (en) | Laser GMAW composite welding method for H04MnNi2Ti steel sandwich structure | |
| CN113172311B (en) | Welding method and welding joint structure for CT80 steel-grade coiled tubing butt welding | |
| CN112894141B (en) | Laser welding method for special engine air inlet section component | |
| CN117259925A (en) | Nonstandard spray pipe and welding process applicable to nonstandard spray pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |