CN118180535A - Vacuum brazing method and product of annular seal ring assembly - Google Patents
Vacuum brazing method and product of annular seal ring assembly Download PDFInfo
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- CN118180535A CN118180535A CN202410452771.8A CN202410452771A CN118180535A CN 118180535 A CN118180535 A CN 118180535A CN 202410452771 A CN202410452771 A CN 202410452771A CN 118180535 A CN118180535 A CN 118180535A
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- brazing
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- filler metal
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- 238000005219 brazing Methods 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 88
- 229910052751 metal Inorganic materials 0.000 claims abstract description 44
- 239000002184 metal Substances 0.000 claims abstract description 44
- 239000000945 filler Substances 0.000 claims abstract description 42
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910000679 solder Inorganic materials 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000004146 energy storage Methods 0.000 claims abstract description 9
- 238000007747 plating Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 239000011888 foil Substances 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 210000001503 joint Anatomy 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 239000004793 Polystyrene Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 claims 2
- 239000000843 powder Substances 0.000 claims 1
- 229910000570 Cupronickel Inorganic materials 0.000 abstract description 19
- 238000012797 qualification Methods 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract 1
- 238000005476 soldering Methods 0.000 abstract 1
- 239000011257 shell material Substances 0.000 description 22
- 230000007547 defect Effects 0.000 description 5
- 239000002981 blocking agent Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 208000034423 Delivery Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical class [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
- B23K3/085—Cooling, heat sink or heat shielding means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
The invention relates to the technical field of engine assembly welding, in particular to a vacuum brazing method and a product of an annular sealing ring assembly, comprising the following steps of: s1, cleaning; s2, nickel plating; s3, segmenting the foil-shaped brazing filler metal, and fixing the segmented foil-shaped brazing filler metal on a nickel layer of the primary part in an energy storage spot welding mode to obtain a secondary part fixed with the foil-shaped brazing filler metal; s4, assembling the part, on which the foil-shaped brazing filler metal is fixed, of the secondary part and the sealing belt by using a sectional type combined brazing clamp to obtain a tertiary part; s5, coating paste solder on a joint between the foil solder of the tertiary part and the sealing strip to obtain a part to be soldered; and S6, placing the part to be soldered under the vacuum heating condition for soldering, and cooling to obtain a finished annular sealing piece. The invention solves the problem of low welding qualification rate of the whole ring of the annular white copper by cutting the annular white copper sealing strip part into the sector section and carrying out vacuum brazing on the annular sealing ring shell.
Description
Technical Field
The invention relates to the technical field of engine assembly welding, in particular to a vacuum brazing method and a product of an annular sealing ring assembly.
Background
The annular sealing ring component is a sealing part of an engine, is required to be resistant to abrasion and good in sealing performance, and is formed by high-temperature vacuum brazing of a sealing ring shell and a sealing belt.
The existing shell material of a certain sealing ring is GH4648, the titanium, niobium and aluminum content in the material is high, and the weldability is poor; the sealing band material of the sector section is white copper B19, the heat conductivity of the white copper B19 is high, the linear expansion coefficient is large, when the vacuum brazing is carried out after the white copper and GH4648 are assembled, the brazing gaps of the two materials can be changed due to different heat capacity and linear expansion coefficients, meanwhile, the brazing filler metal B-Cu35NiMnCoFeSi (B, P) -S used by the part is easy to oxidize, the vacuum brazing parameter requirement of the part is high, the end face gaps of 10 sealing bands after the vacuum brazing of the part are required to meet the requirement of 0.8max, the qualification rate after the vacuum brazing of the part is low for a long time, and the normal delivery of an engine is restricted.
Disclosure of Invention
Aiming at the problem of lower qualification rate of the sealing ring during vacuum brazing in the prior art, the invention provides a vacuum brazing method and a product of an annular sealing ring assembly.
The invention is realized by the following technical scheme:
The vacuum brazing method of the annular sealing ring assembly comprises a sealing ring shell and a plurality of fan-shaped sealing strips, wherein the sealing strips are fixedly brazed along the peripheral wall of the sealing ring shell in a segmented mode, the sealing ring shell is made of GH4648, and the sealing strips are made of B19; the specific steps of brazing the sealing tape are as follows:
s1, cleaning a shell of a seal ring to be processed and an annular outer wall of the seal ring shell to be brazed to obtain a pretreated part;
s2, performing nickel plating treatment on the annular outer wall of the pretreated part to obtain a primary part with a nickel layer;
S3, segmenting the foil-shaped brazing filler metal, and fixing the segmented foil-shaped brazing filler metal on a nickel layer of the primary part in an energy storage spot welding mode to obtain a secondary part fixed with the foil-shaped brazing filler metal;
S4, assembling the part, on which the foil-shaped brazing filler metal is fixed, of the secondary part and the sealing belt by using a sectional type combined brazing clamp to obtain a tertiary part;
s5, coating paste solder on a joint between the foil solder of the tertiary part and the sealing strip to obtain a part to be soldered;
and S6, placing the part to be brazed under the vacuum heating condition for brazing, and then cooling to obtain the finished annular sealing piece.
Preferably, in S2, the nickel layer has a thickness of 3 to 6. Mu.m.
Preferably, in the step S3, the energy of the energy storage spot welding is 5% -15% during the energy storage spot welding, and the spot distance is smaller than 10mm;
the foil-shaped brazing filler metal adopts B-Cu35NiMnCoFeSi (B, P) -S foil-shaped brazing filler metal, and the single foil-shaped brazing filler metal after segmentation has the same width and equal length as the fan-shaped sealing band.
Preferably, in S4, during assembly, a sectional type combined brazing fixture is adopted for assembly, the sectional type combined brazing fixture includes a pressing block and a plurality of expansion blocks, the expansion blocks are in a sector shape, the expansion blocks are attached to the outer circumferential surface of the sealing band, and the plurality of expansion blocks form an annular assembly; the pressing block is conical and is inversely arranged in the inner ring of the annular assembly, and the sealing belt can be pressed by the expanding block after being pressed down.
Preferably, a flow blocking agent is coated between two adjacent sealing bands, and the flow blocking agent is a mixture containing titanium and calcium oxides.
Preferably, the abutting gap between two adjacent sealing strips is 0.5-0.7 mm, a spacer is arranged in the gap at the abutting position of two adjacent foil-shaped solders, the thickness of the spacer is the same as that of the abutting gap, and the cross section area of the spacer is the same as that of the side end face of the sealing strip.
Preferably, in S5, when paste solder is applied, the solder includes powdered solder and a binder, and the binder includes polystyrene and trichloroethylene.
Preferably, in S6, during brazing, the cold vacuum degree of the brazing apparatus is less than 4×10 -2 Pa, and the working vacuum degree is less than 4×10 -2 Pa; in S6, the heating at the time of brazing includes a first high temperature stage and a second high temperature stage;
Heating the temperature of the brazing equipment from room temperature to 800+/-10 ℃ at the speed of 600-660 ℃/h in the first high-temperature stage, keeping the temperature for 25-30 min, and introducing argon to the partial pressure of 15-25 Pa;
the temperature in the second high temperature stage is heated from 800+/-10 ℃ to 1080+/-10 ℃ at the speed of 540 ℃/h to 660 ℃/h, and the temperature is kept for 20 to 25 minutes.
Preferably, in S5, the cooling comprises partial pressure cooling and air cooling, wherein the temperature is reduced from 1080+/-10 ℃ to below 900 ℃ in the partial pressure cooling process, then argon is introduced until the working vacuum degree of the brazing equipment reaches atmospheric pressure, air cooling is carried out until the working vacuum degree is below 80 ℃, then gas is backfilled, and the finished part is taken out after being opened into a furnace.
A product made by a vacuum brazing process such as an annular seal ring assembly.
Compared with the prior art, the invention has the following beneficial effects:
according to the vacuum brazing method of the annular sealing ring assembly, the annular white copper sealing strip part is cut into the sector sections and the annular sealing ring shell is subjected to vacuum brazing, so that the problem of low welding qualification rate of the annular white copper whole ring is solved, and further the problem of vacuum brazing of the annular sealing ring assembly of a certain machine is solved, and the brazing seam is qualified once after the part is subjected to vacuum brazing.
Further, a sectional type combined brazing clamp is arranged to solve the problem of the change of a brazing gap during vacuum brazing after assembling of white copper and GH 4648.
Furthermore, the method for placing the spacer which has the same cross section area as the side end surface and the same thickness as the gap at the butt joint part between the sealing belts of the adjacent annular sector sections effectively solves the problem of overflow of the brazing filler metal at the butt joint part after the brazing filler metal is melted by vacuum brazing, and ensures that the end surface gap of the sealing belt after the vacuum brazing of the part needs to meet the requirement of 0.8 max.
Furthermore, the formulated technological parameters solve the problems that B-Cu35NiMnCoFeSi (B, P) -S is easy to oxidize and difficult to spread, and the brazing filler metal can be used for effectively filling the brazing seam and cannot overflow excessively under the parameters.
Furthermore, the first high-temperature stage during brazing is to ensure that the parts are heated uniformly before brazing, and argon with the pressure of 15-25 Pa is introduced during heating to avoid volatilization of high vapor pressure elements (Cu elements and Mn elements) in the B-Cu35NiMnCoFeSi (B, P) -S brazing filler metal at high temperature as much as possible. The specified brazing temperature in the second high-temperature stage is used for fully spreading and filling the whole brazing surface by the brazing filler metal, so that the brazing seam quality of the parts is ensured.
Drawings
FIG. 1 is a schematic view of a seal ring of the present invention;
FIG. 2 is a flow chart of a method of vacuum brazing an annular seal ring assembly of the present invention;
FIG. 3 is a schematic view of a sectional composite brazing jig according to the invention;
FIG. 4 is a cross-sectional view of a sectional composite brazing jig according to the invention.
In the figure, 1, a pressing block; 2. expanding blocks; 3. and (5) sealing the ring.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention discloses a vacuum brazing method of an annular sealing ring assembly, and referring to FIG. 1, the annular sealing ring assembly comprises a sealing ring shell and a plurality of sector sealing strips, the plurality of sealing strips are fixed by subsection brazing along the peripheral wall of the sealing ring shell, the sealing ring shell is made of GH4648, the sealing strip is made of B19, and the sealing strip is divided into 10 sections in the embodiment.
Referring to fig. 2, the specific steps of brazing the sealing tape are as follows:
S1, cleaning a shell of a seal ring to be processed and an annular outer wall of the seal ring shell to be brazed to obtain a pretreated part; the method comprises the following steps:
And (3) carrying out ultrasonic cleaning on the right sealing belt and the right sealing ring shell which are machined, wherein solutes used for ultrasonic cleaning are water-based cleaning agents, then cleaning the to-be-brazed parts of the two parts by using acetone, airing the parts in air after cleaning, carrying out cleanliness test by using a water-based marker, and ensuring that the parts are cleaned by using no shrinkage of a pen mark when the water-based marker is used for detection.
S2, performing nickel plating treatment on the annular outer wall of the pretreated part to obtain a primary part with a nickel layer;
To increase the spreading of the brazing filler metal on the surface of the part brazing place (namely the annular outer wall), a nickel plating process is added on the surface to be brazed of the right seal ring shell made of GH4648, and the thickness of nickel plating is about 3-6 mu m. The nickel plating layer of the part to be soldered should be firmly bonded with the right seal ring housing, and not allowed to have convex hulls, bubbles, flaking, cracking, roughness or porosity defects.
S3, segmenting the foil-shaped brazing filler metal, and fixing the segmented foil-shaped brazing filler metal on a nickel layer of the primary part in an energy storage spot welding mode to obtain a secondary part fixed with the foil-shaped brazing filler metal; the method comprises the following steps:
Firstly, shearing the B-Cu35NiMnCoFeSi (B, P) -S foil-shaped brazing filler metal with the thickness of 0.1mm into a shape with the same width and equal length as the sector-shaped section sealing band, then fixing the foil-shaped brazing filler metal on the surface to be brazed of the sealing ring shell in an energy storage spot welding mode, wherein two layers of brazing filler metal are pre-buried, and gaps can be formed, but the brazing filler metal cannot be lapped, the energy of the energy storage spot welding is 5% -15%, and the spot distance is smaller than 10mm.
S4, assembling the part, on which the foil-shaped brazing filler metal is fixed, of the secondary part and the sealing belt by using a sectional type combined brazing clamp to obtain a tertiary part;
During assembly, a sectional type combined brazing clamp (shown in figures 3 and 4) is adopted for assembly, the sectional type combined brazing clamp comprises a pressing block and a plurality of expansion blocks, the expansion blocks are in a fan shape, the expansion blocks are attached to the outer circle surface of the sealing band, and the plurality of expansion blocks form an annular assembly; the pressing block is conical and is inversely arranged in the inner ring of the annular assembly, and the sealing belt can be pressed by the expanding block after being pressed down.
The assembly process is as follows: and coating a layer of flow blocking agent on the adjacent side end surfaces of the sealing bands of the 10 sector sections, wherein the flow blocking agent is a mixture of oxides of elements such as titanium, calcium and the like, and the flow is red. And then fixing the foil-shaped brazing filler metal part of the sealing ring shell and the outer surface of the sector-shaped sealing strip by using metal fixing glue, wherein the metal fixing glue amount is as small as possible, the parts can be firmly bonded, 10 butt joint gaps B1 of the sector-shaped sector of the white copper are 0.5-0.7 mm, and meanwhile, white paper sheets which have the same cross section area as the side end surface of the sector-shaped sector of the white copper, have the same thickness as the butt joint gaps and have no marks on the surfaces are placed between the gaps.
In order to prevent the brazing gap from becoming larger due to the excessive expansion of the sealing band with the sector section made of the material, a sectional type combined brazing clamp made of 1Cr18Ni9Ti is adopted for control, and the sectional type combined brazing clamp mainly comprises a pressing block and an expansion block. Firstly, tightly attaching the segmented sector-shaped expansion blocks to the outer circle surface of the sector-shaped sealing band, and then compacting the segmented expansion blocks of the sector-shaped segment by utilizing the pressing blocks of the cone.
And S5, coating paste solder (the ingredients of the solder comprise powdered solder and a binder, and the ingredients of the binder comprise polystyrene and trichloroethylene) on a joint between the foil solder of the three-time part and the sealing tape to obtain the part to be soldered.
The specific operation in this embodiment is as follows: paste B-Cu35NiMnCoFeSi (B, P) -S was uniformly applied to the joint of the part to be soldered by means of a syringe, the solder width was 1.2mm, and paste solder was prepared by mixing 80g of powdered solder with 15g of a prepared binder (prepared according to the preparation method of the binder: wherein the binder component was 45g of polystyrene and 500Ml of trichloroethylene) and stirring uniformly using a glass rod. And during repair welding, B-Cu35NiMnCoFeSi (B, P) -S solder is coated on the unqualified part. After the brazing filler metal is dried, the redundant brazing filler metal is scraped by a surgical knife, and the redundant brazing filler metal is not left in a non-brazing area of the part.
And S6, placing the part to be brazed under the vacuum heating condition for brazing, and then cooling to obtain the finished annular sealing piece. In the embodiment, the parts with the sectional type combined brazing clamp are horizontally placed on a bracket of a vacuum furnace for brazing. The brazing equipment adopts a Huahai large-scale horizontal VBF-300 vacuum brazing furnace, and the parameters are as follows: the effective heating area is 1200mm multiplied by 900mm, the furnace temperature uniformity (800-1200) DEG C/+/-5 ℃ and the pressure rise rate is less than or equal to 0.2Pa/h.
During brazing, the cold vacuum degree of the brazing equipment is smaller than 4 multiplied by 10 -2 Pa, and the working vacuum degree is smaller than 4 multiplied by 10 -2 Pa.
Heating includes a first high temperature stage and a second high temperature stage; heating the temperature of the brazing equipment from room temperature to 800+/-10 ℃ at the speed of 600-660 ℃/h in the first high-temperature stage, keeping the temperature for 25-30 min, and introducing argon to the partial pressure of 15-25 Pa; the temperature in the second high temperature stage is heated from 800+/-10 ℃ to 1080+/-10 ℃ at the speed of 540 ℃/h to 660 ℃/h, and the temperature is kept for 20 to 25 minutes.
The cooling comprises partial pressure cooling and air cooling, wherein the temperature is reduced from 1080+/-10 ℃ to below 900 ℃ in the partial pressure cooling process, argon is then introduced until the working vacuum degree of the brazing equipment reaches atmospheric pressure, air cooling is carried out until the temperature is below 80 ℃, then gas is backfilled, and a finished part is taken out after the furnace is opened.
And (3) overflowing and splashing the excessive brazing filler metal exceeding the standard requirement, and polishing the excessive brazing filler metal clean by using a file made of alloy materials, so that a substrate cannot be damaged.
S7, performing X-ray inspection on the finished part
Checking and accepting vacuum brazing welding seams between the sealing ring shell and the sealing belt, and checking the brazing welding seams by using X rays, wherein the specific requirements are as follows:
1) The whole braze joint allows no more than 3 parts with the axial penetrability of less than 3mm or the axial length exceeding 30% of the width of the cupronickel piece, except the braze joint between the butt joint of the cupronickel piece and the shell. 2) Allowing for the presence of unwelded areas less than 50mm 2. 3) Single unwelded defects having an area greater than 50mm 2 and less than 200mm 2 are allowed, but should be greater than 5mm from the end edge, and the distance between two defects is not less than 30mm, the smaller spacing defects can be counted in one place. 4) The presence of a non-welded joint between the cupronickel piece and the housing part along the end face is allowed, the non-welded joint depth should be less than 5mm, the individual length should be less than 10mm, and the total length should be less than 10% of the total length of the braze joint. 5) Gaps at the butt joint of the cupronickel workpieces do not account for brazing areas; the non-welded joint of the cupronickel piece and the shell part at the joint should be no more than 30% of the width of the cupronickel piece in the axial length. 6) The brazing rate of the whole cupronickel piece and the shell is more than or equal to 90 percent.
S7, visually inspecting the appearance of the solder joint and the part
The soldered seam of the appearance of the part was visually inspected while checking the 10 butt gaps of the segment sealing tape for 0.8max. The specific requirements are as follows:
1) The exposed ends of the braze joints should show the presence of braze filler metals, the braze joints and the base metal are not permitted to have cracks, and oxidation colors are allowed to exist on the surfaces of the components. 2) The surface of the part to be machined subsequently allows the solder to flow, accumulate and splash. 3) After brazing and machining, the following defects are allowed to exist on the end face braze surface of the assembly: a) Irregular rounded corners and partial depressions; b) A length of not more than 10mm, a distance of not less than 10mm from each other, and a total length of less than 10% of a total length of the brazing seam; c) The total length is not more than 20% of the length of the braze joint.
The invention also discloses a product manufactured by the vacuum brazing method of the annular seal ring assembly.
According to the vacuum brazing method of the annular sealing ring assembly, the annular white copper sealing strip part is cut into the sector sections and the annular sealing ring shell is subjected to vacuum brazing, so that the problem of low welding qualification rate of the annular white copper whole ring is solved, and further the problem of vacuum brazing of the annular sealing ring assembly of a certain machine is solved, and the brazing seam is qualified once after the part is subjected to vacuum brazing.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the technical solution of the present invention in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present invention, and these modifications and substitutions are also included in the protection scope of the claims.
Claims (10)
1. The vacuum brazing method of the annular sealing ring assembly is characterized in that the annular sealing ring assembly comprises a sealing ring shell and a plurality of sector-shaped sealing belts, the sealing belts are fixed by subsection brazing along the peripheral wall of the sealing ring shell, the sealing ring shell is made of GH4648, and the sealing belts are made of B19; the specific steps of brazing the sealing tape are as follows:
s1, cleaning a shell of a seal ring to be processed and an annular outer wall of the seal ring shell to be brazed to obtain a pretreated part;
s2, performing nickel plating treatment on the annular outer wall of the pretreated part to obtain a primary part with a nickel layer;
S3, segmenting the foil-shaped brazing filler metal, and fixing the segmented foil-shaped brazing filler metal on a nickel layer of the primary part in an energy storage spot welding mode to obtain a secondary part fixed with the foil-shaped brazing filler metal;
S4, assembling the part, on which the foil-shaped brazing filler metal is fixed, of the secondary part and the sealing belt by using a sectional type combined brazing clamp to obtain a tertiary part;
s5, coating paste solder on a joint between the foil solder of the tertiary part and the sealing strip to obtain a part to be soldered;
and S6, placing the part to be brazed under the vacuum heating condition for brazing, and then cooling to obtain the finished annular sealing piece.
2. The vacuum brazing method of an annular seal ring assembly according to claim 1, wherein in S2, the nickel layer has a thickness of 3 to 6 μm.
3. The vacuum brazing method of the annular seal ring assembly according to claim 1, wherein in S3, the energy storage spot welding energy is 5% -15% and the spot distance is less than 10mm;
the foil-shaped brazing filler metal adopts B-Cu35NiMnCoFeSi (B, P) -S foil-shaped brazing filler metal, and the single foil-shaped brazing filler metal after segmentation has the same width and equal length as the fan-shaped sealing band.
4. The vacuum brazing method of the annular seal ring assembly according to claim 1, wherein in S4, the assembly is performed by using a sectional type combined brazing clamp, the sectional type combined brazing clamp comprises a pressing block and a plurality of expansion blocks, the expansion blocks are in a fan shape, the expansion blocks are attached to the outer circular surface of the sealing band, and the plurality of expansion blocks form an annular assembly; the pressing block is conical and is inversely arranged in the inner ring of the annular assembly, and the sealing belt can be pressed by the expanding block after being pressed down.
5. The method of vacuum brazing an annular seal ring assembly according to claim 4, wherein a flow inhibitor is applied between adjacent sealing strips, the flow inhibitor being a mixture comprising oxides of titanium and calcium.
6. The vacuum brazing method of the annular seal ring assembly according to claim 4, wherein a butt joint gap between two adjacent seal strips is 0.5-0.7 mm, a spacer is arranged in a gap at a butt joint position of two adjacent foil-shaped solders, the thickness of the spacer is the same as the butt joint gap, and the cross-sectional area of the spacer is the same as the cross-sectional area of the side end faces of the seal strips.
7. The vacuum brazing method of an annular seal ring assembly according to claim 1, wherein in S5, the brazing filler metal comprises a powder brazing filler metal and a binder, and the binder comprises polystyrene and trichloroethylene.
8. The vacuum brazing method of the annular seal ring assembly according to claim 1, wherein in S6, the cold state vacuum degree of the brazing apparatus is less than 4 x 10 -2 Pa, and the working vacuum degree is less than 4 x 10 -2 Pa; the heating during brazing comprises a first high-temperature stage and a second high-temperature stage;
Heating the temperature of the brazing equipment from room temperature to 800+/-10 ℃ at the speed of 600-660 ℃/h in the first high-temperature stage, keeping the temperature for 25-30 min, and introducing argon to the partial pressure of 15-25 Pa;
the temperature in the second high temperature stage is heated from 800+/-10 ℃ to 1080+/-10 ℃ at the speed of 540 ℃/h to 660 ℃/h, and the temperature is kept for 20 to 25 minutes.
9. The vacuum brazing method of the annular seal ring assembly according to claim 1, wherein in S5, the cooling comprises partial pressure cooling and air cooling, the temperature is reduced from 1080+/-10 ℃ to below 900 ℃ in the partial pressure cooling process, then argon is introduced until the working vacuum degree of the brazing equipment reaches atmospheric pressure, air cooling is carried out until the working vacuum degree is below 80 ℃, then gas is backfilled, and the finished part is taken out in a furnace.
10. A product made by the vacuum brazing method of the annular seal ring assembly according to any one of claims 1 to 9.
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| CN202410452771.8A CN118180535A (en) | 2024-04-16 | 2024-04-16 | Vacuum brazing method and product of annular seal ring assembly |
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| CN202410452771.8A CN118180535A (en) | 2024-04-16 | 2024-04-16 | Vacuum brazing method and product of annular seal ring assembly |
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