CN117259887A - Method for vacuum brazing of nozzle shell with inner tube and tool used by method - Google Patents
Method for vacuum brazing of nozzle shell with inner tube and tool used by method Download PDFInfo
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- CN117259887A CN117259887A CN202311438425.6A CN202311438425A CN117259887A CN 117259887 A CN117259887 A CN 117259887A CN 202311438425 A CN202311438425 A CN 202311438425A CN 117259887 A CN117259887 A CN 117259887A
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- oil pipe
- auxiliary oil
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- nozzle
- end cover
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- 238000005219 brazing Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 69
- 238000003466 welding Methods 0.000 claims abstract description 112
- 238000004146 energy storage Methods 0.000 claims abstract description 17
- 239000000945 filler Substances 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 23
- 229910000679 solder Inorganic materials 0.000 claims description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 19
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000011179 visual inspection Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 239000002932 luster Substances 0.000 claims description 5
- 229910000601 superalloy Inorganic materials 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 230000000717 retained effect Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract description 8
- 230000037431 insertion Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- QZLJNVMRJXHARQ-UHFFFAOYSA-N [Zr].[Cr].[Cu] Chemical compound [Zr].[Cr].[Cu] QZLJNVMRJXHARQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000011160 research Methods 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- 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
- B23K3/087—Soldering or brazing jigs, fixtures or clamping means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a method for vacuum brazing of a nozzle shell with an inner tube and a tool used by the method, which belong to the technical field of welding. And combining theoretical analysis and process test data to determine the depth value of the auxiliary oil pipe to be inserted into the shell before welding. Based on the depth value, the special assembly positioning clamp is designed and manufactured, so that the insertion depth of the auxiliary oil pipe is ensured, and meanwhile, the angular assembly position of the auxiliary oil pipe relative to the shell is ensured; based on the design value of the depth of the auxiliary oil pipe inserted into the shell before welding, a special furnace feeding welding fixture is designed and manufactured, a triple positioning connection mode of burr positioning, energy storage spot welding brazing filler metal positioning and welding fixture positioning is adopted, and meanwhile, a furnace feeding brazing placing mode of the shell with the inner pipe nozzle is designed, so that welding deformation is effectively controlled, and the later assembly and processing requirements of parts are guaranteed.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a method for vacuum brazing of a nozzle shell with an inner tube and a tool used by the method.
Background
The nozzle housing with inner tube for a certain gas turbine consists of a nozzle housing made of GH536 material and a secondary oil pipe made of 1Cr18Ni9Ti material. The nozzle end cover in the nozzle shell is connected with the nozzle base by argon arc welding; and the nozzle end cover is connected with the auxiliary oil pipe by adopting vacuum brazing. When the auxiliary oil pipe is brazed in vacuum, the welding quality of the auxiliary oil pipe is ensured, and the depth of the auxiliary oil pipe inserted into the shell and the angular assembly position of the auxiliary oil pipe relative to the shell are ensured.
The conventional method which can be considered by the engineering skilled in the art is to dispatch the special fixture and measuring tool, but the design scheme and the using method of the fixture and the measuring tool need to accord with the vacuum brazing process arrangement, and the following aspects should be considered comprehensively in detail: how to perform pre-welding assembly positioning can ensure firm positioning and insertion depth and angular position; the nozzle shell and the auxiliary oil pipe are made of dissimilar materials, the difference of linear expansion coefficients is large, for example, when the temperature is increased to 700 ℃ from room temperature, the linear expansion coefficient of GH536 is 15.5, and the linear expansion coefficient of 1Cr18Ni9Ti is 18.6, on the other hand, the nozzle shell is a thick large piece, the auxiliary oil pipe is an elongated thin-wall guide pipe piece, and the characteristics of materials and structural dimensions lead to easy deformation or displacement of the auxiliary oil pipe in the vacuum brazing process, so that effective measures are adopted for control.
In summary, in the background of the prior art, there is a great technical difficulty in vacuum brazing the nozzle housing, and a great deal of theoretical analysis and experimental researches need to be performed to grasp the method.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for vacuum brazing of a nozzle shell with an inner pipe and a tool used by the method, so as to solve the technical problems that when a certain nozzle shell is used for vacuum brazing of an auxiliary oil pipe, the welding quality of the auxiliary oil pipe, the insertion depth of the auxiliary oil pipe and the angular assembly position of the auxiliary oil pipe are required to be ensured at the same time.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
an assembly positioning fixture, comprising: the device comprises a bottom plate, a locating pin, a bolt, a support and an indication block; the support is fixed in one side of bottom plate, and the pinhole has been seted up to the opposite side of bottom plate, and locating pin one end is inserted in the pinhole, and the other end inserts in the vertical hole of nozzle end cover, and the bolt is inserted and is established on the support, and its one end inserts in the horizontal hole of nozzle end cover, and the instruction piece sets up and is located nozzle end cover top at the support top.
A finger die gauge comprising a gauge body, a measuring rod and a set screw; the gauge body is sleeved on the measuring rod and is fixed through a set screw.
The utility model provides a welding jig, welding jig is for adopting the nozzle base formula structure of integration processing, and its inside cavity, the aperture that is adapted to vice oil pipe is seted up to the bottom.
The invention discloses a method for vacuum brazing of a nozzle shell with an inner pipe, which adopts the tool and comprises the following steps:
determining the depth value of the auxiliary oil pipe inserted into the shell before welding and knocking the auxiliary oil pipe into the nozzle end cover in a burr positioning mode;
sleeving a brazing filler metal ring on the exposed surface of the joint of the auxiliary oil pipe and the nozzle end cover, and fixing the brazing filler metal ring by energy storage spot welding;
sleeving a welding fixture on a nozzle end cover through an auxiliary oil pipe, and realizing connection between the welding fixture and the nozzle end cover and between the welding fixture and the auxiliary oil pipe by adopting an energy storage spot welding superalloy sheet lap joint positioning method;
under the condition of the welding fixture, the nozzle end cover is kept at the lower part, the welding fixture is arranged at the upper part, and the nozzle end cover is vertically placed into the furnace, so that the vacuum brazing connection between the nozzle end cover and the auxiliary oil pipe is realized.
Preferably, the method of using burr positioning to knock the auxiliary oil pipe into the nozzle end cover specifically includes:
s101: mounting a nozzle end cover with a nozzle onto an assembly positioning fixture;
s102: marking on the outer circumferential end surface of the auxiliary oil pipe far away from the welding seam according to the later assembly angular position of the auxiliary oil pipe, and marking 3-4 sample punching points on the to-be-welded part of the auxiliary oil pipe along the circumference, wherein the sample punching points are uniformly distributed;
s103: the end face scribing on the auxiliary oil pipe and the connecting line of two points of the indicating block on the assembly positioning fixture are ensured to be positioned on the same straight line, and the auxiliary oil pipe is knocked into the nozzle end cover in a burr positioning mode.
Preferably, before the welding fixture is sleeved on the nozzle end cover through the auxiliary oil pipe, the bottom plate and the locating pins in the assembly locating fixture are reserved, and other components in the assembly locating fixture are removed.
Preferably, before the secondary oil pipe is knocked into the nozzle end cover by adopting the burr positioning mode, the method further comprises:
polishing and cleaning the position to be welded until the surface of the part is exposed with fresh metallic luster and no dirt;
and preparing a solder ring.
Preferably, before the furnace inlet vacuum brazing of the auxiliary oil pipe and the nozzle end cover, the method further comprises: detecting the position degree; and under the condition that the part is provided with the welding fixture, detecting the depth of the auxiliary oil pipe inserted into the shell by adopting a fingerprint gauge, and judging whether the auxiliary oil pipe is qualified or not.
Preferably, the furnace inlet vacuum brazing auxiliary oil pipe and the nozzle end cover are specifically as follows:
heating to 900 ℃ at a heating rate of 580-620 ℃/h under a vacuum environment, and preserving heat for 30-40 min;
heating to 1000-1010 ℃ at a heating rate of 430-470 ℃/h, preserving heat for 10-20 min, and brazing the parts;
finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace.
Preferably, after the vacuum brazing of the auxiliary oil pipe and the nozzle end cover, the method further comprises:
cleaning a part, removing a high-temperature alloy sheet generated during assembly and positioning of the auxiliary oil pipe, taking down a welding fixture from a nozzle end cover, and self-checking the quality of a welding line, and removing the welding line by polishing if the brazing filler metal overflows, splashes and piles up on the surface of the part;
visual inspection and sealing test.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, on the design of the whole process route, the brazing connection between the nozzle end cover and the auxiliary oil pipe is finished firstly, and then the nozzle end cover and the nozzle base are connected through argon arc welding, so that the implementation of the vacuum brazing process operation process is facilitated.
And combining theoretical analysis and process test data to determine the depth value of the auxiliary oil pipe to be inserted into the shell before welding. Then, based on the depth value, a special assembly positioning clamp is designed and manufactured, and the insertion depth of the auxiliary oil pipe is ensured, and meanwhile, the angular assembly position of the auxiliary oil pipe relative to the shell is ensured.
Inspired by the structure of the nozzle base, the implementation details of the reverse-thrust vacuum brazing process are designed by the whole process route, the special furnace feeding welding fixture is designed and manufactured based on the design value of the depth of the auxiliary oil pipe inserted into the shell before welding, and a triple positioning connection mode of burr positioning, energy storage spot welding brazing filler metal positioning and welding fixture positioning is adopted.
The special measuring tool is designed and manufactured, and the measuring tool is used for detection after the auxiliary oil pipe is assembled and positioned and the auxiliary oil pipe is vacuum brazed and discharged from the furnace, so that the requirement of the insertion depth dimension of the auxiliary oil pipe is met.
The complete process provided by the invention solves the technical problems that the welding quality of the auxiliary oil pipe, the depth dimension of the inserted casing of the auxiliary oil pipe and the angular assembly position of the auxiliary oil pipe are required to be ensured simultaneously when the auxiliary oil pipe is brazed in vacuum by a certain type of nozzle casing, ensures the smooth delivery of a certain type of gas turbine, enriches technical reserves, has important engineering reference value for processing and manufacturing similar parts, and has wide application prospect in the field of military and civil fusion conversion.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of the structure of the parts, wherein (a) is a schematic view of the nozzle base not installed, and (b) is a schematic view of the parts after the nozzle base is installed;
FIG. 3 is a schematic view of the structure of the positioning fixture of the present invention, wherein (a) is a schematic view of assembled parts and (b) is a schematic view of unassembled parts;
FIG. 4 is a schematic diagram of a measuring tool, i.e., a finger gauge;
FIG. 5 is a schematic structural view of a welding fixture;
fig. 6 is a schematic view of the in-furnace welding placement of the nozzle housing with the inner tube:
FIG. 7 is a first braze joint quality golden phase diagram between the secondary oil pipe and the nozzle end cover;
FIG. 8 is a second braze joint quality golden phase diagram between the secondary oil tube and the nozzle end cover.
Wherein: 1-a nozzle end cap; 2-auxiliary oil pipes; 3-vacuum brazing the weld; 4-a nozzle base; 5-argon arc welding; 6-nozzle housing with inner tube; 7-a bottom plate; 8-locating pins; 9-a bolt; 10-supporting seats; 11-an indication block; 12-gauge body; 13-measuring bar; 14-a set screw; 15-welding fixture.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
in order to solve the technical problems that the welding quality of the auxiliary oil pipe 2, the insertion depth of the auxiliary oil pipe 2 and the angular assembly position of the auxiliary oil pipe are required to be ensured simultaneously when a certain nozzle shell is subjected to vacuum brazing of the auxiliary oil pipe, the invention provides a method for vacuum brazing of the nozzle shell with the inner pipe and a tool used by the method.
As described in the background art, when the sub-oil pipe 2 is vacuum brazed, the nozzle housing is relatively rigid, and it is theoretically presumed that the variation of the sub-oil pipe 2 is as follows: taking the to-be-welded brazing seam as a fulcrum, and contracting and deforming or outwards elongating and deforming the two ends of the auxiliary oil pipe 2 towards the to-be-welded brazing seam; taking the to-be-welded brazing seam as a datum point, and carrying out integral displacement on the auxiliary oil pipe 2; or both plastic deformation and displacement.
Theoretical analysis also requires feedback and correction of test data. Therefore, a great deal of process tests are carried out, and finally, the fact that the auxiliary oil pipe 2 mainly moves in a displacement manner and the displacement amount is about 0.6mm in the vacuum brazing process is found for the nozzle shell with the inner pipe. This displacement of 0.6mm is reserved when the pilot tubing is assembled before welding, thereby determining the depth to which the pilot tubing 2 should be inserted into the housing. Based on the depth value, a special assembly positioning jig, a special measuring tool, and a special furnace feeding welding jig 15 are designed and manufactured. The insertion depth of the sub oil pipe 2 is ensured, and the angular assembly position of the sub oil pipe 2 relative to the housing is ensured. The special assembly positioning fixture consists of a bottom plate 7, a positioning pin 8, a bolt 9, a support 10 and an indication block 11, wherein the positioning pin 8 and the bolt 9 are made of chromium-zirconium-copper materials with good electric and heat conductivity and high hardness. The special measuring tool, namely the finger die gauge, consists of a gauge body 12, a measuring rod 13 and a set screw 14. The welding fixture 15 of the special furnace is of a structure similar to a nozzle base by adopting integrated processing.
Referring to fig. 3, the invention discloses an assembly positioning fixture, comprising: the bottom plate 7, the locating pin 8, the bolt 9, the support 10 and the indicating block 11; the support 10 is fixed in one side of the bottom plate 7, the other side of the bottom plate 7 is provided with a pin hole, one end of a locating pin 8 is inserted into the pin hole, the other end of the locating pin is inserted into a vertical hole of the nozzle end cover 1, a bolt 9 is inserted on the support 10, one end of the bolt 9 is inserted into a horizontal hole of the nozzle end cover 1, and an indication block 11 is arranged at the top of the support 10 and is positioned above the nozzle end cover 1.
Referring to fig. 5, the invention discloses a welding fixture 15, which is of an integrally processed nozzle base structure, the inside of the welding fixture is hollow, and a small hole adapted to an auxiliary oil pipe 2 is formed at the bottom of the welding fixture.
Referring to fig. 4, the invention discloses a finger die gauge, which comprises a gauge body 12, a measuring rod 13 and a set screw 14; the gauge body 12 is sleeved on the measuring rod 13 and fixed by the set screw 14.
The invention also discloses a method for vacuum brazing the nozzle shell with the inner tube, which adopts the tool and comprises the following steps:
s1: determining the depth value of the auxiliary oil pipe 2 inserted into the shell before welding and knocking the auxiliary oil pipe 2 into the nozzle end cover 1 in a burr positioning mode;
s2: the solder ring is sleeved on the exposed surface of the joint of the auxiliary oil pipe 2 and the nozzle end cover 1 and is fixed by energy storage spot welding;
s3: the welding fixture penetrates through the auxiliary oil pipe 2 and is sleeved on the nozzle end cover 1, and the welding fixture and the nozzle end cover 1 and the auxiliary oil pipe 2 are connected by adopting an energy storage spot welding superalloy sheet lap joint positioning method;
s4: under the condition of the welding fixture, the nozzle end cover 1 is kept at the lower part, the welding fixture is arranged at the upper part, and the nozzle end cover 1 and the auxiliary oil pipe 2 are vertically placed into the furnace, so that the vacuum brazing connection between the nozzle end cover 1 and the auxiliary oil pipe 2 is realized.
According to the invention, on the design of the whole process route, the brazing connection between the nozzle end cover and the auxiliary oil pipe is finished firstly, and then the nozzle end cover and the nozzle base are connected through argon arc welding, so that the implementation of the vacuum brazing process operation process is facilitated. And combining theoretical analysis and process test data to determine the depth value of the auxiliary oil pipe to be inserted into the shell before welding. Then, based on the depth value, a special assembly positioning clamp is designed and manufactured, and the insertion depth of the auxiliary oil pipe is ensured, and meanwhile, the angular assembly position of the auxiliary oil pipe relative to the shell is ensured. The triple positioning connection mode of burr positioning, energy storage spot welding brazing filler metal positioning and welding fixture positioning is adopted, and meanwhile, the furnace feeding brazing placing mode of the nozzle shell with the inner pipe is designed, so that the welding deformation is effectively controlled, and the later assembly and processing requirements of parts are ensured.
In some embodiments, the method for knocking the auxiliary oil pipe 2 into the nozzle end cover 1 by adopting the burr positioning method specifically includes:
s101: mounting the nozzle end cover 1 with the nozzle on an assembly positioning fixture;
according to the method shown in fig. 3, a nozzle end cover with a nozzle is firstly installed on an assembly positioning clamp, so that a positioning pin can be completely inserted into a vertical hole of the nozzle end cover, and then the nozzle end cover is rotated, so that a bolt can be completely inserted into a horizontal hole of the nozzle end cover.
S102: marking on the outer circumferential end surface of the auxiliary oil pipe 2 far away from the welding seam side according to the later assembly angular position of the auxiliary oil pipe 2, and marking 3-4 sampling points on the part to be welded of the auxiliary oil pipe 2 along the circumference, wherein the sampling points are uniformly distributed;
s103: the end face scribing on the auxiliary oil pipe and the connecting line of two points of the indicating block on the assembly positioning fixture are ensured to be positioned on the same straight line, and the auxiliary oil pipe 2 is knocked into the nozzle end cover 1 in a burr positioning mode.
On the basis, attention is paid to the fact that the auxiliary oil pipe is assembled to the bottom and is tightly attached to the positioning pin on the assembly positioning clamp.
In some embodiments, S2 is specifically that 2 prepared solder rings are clamped by tweezers, sleeved on the exposed surface of the joint of the auxiliary oil pipe and the nozzle end cover, and fixed by energy storage spot welding. The energy storage spot welding energy is used for firmly positioning the brazing filler metal ring at the position of the brazing seam to be welded.
In some embodiments, before the welding fixture is sleeved on the nozzle end cover 1 through the auxiliary oil pipe 2, the bottom plate 7 and the locating pin 8 in the assembly locating fixture are reserved, and other components in the assembly locating fixture are removed; the welding fixture penetrates through the auxiliary oil pipe to be sleeved on the nozzle end cover, the auxiliary oil pipe is guaranteed to extend out of the middle small hole on the welding fixture, the welding fixture is noted to be assembled to the bottom, and the outer circle end face of the auxiliary oil pipe, which is far away from the welding seam side, is enabled to be flush with the end face of the exposed end of the welding fixture. And then, the connection between the welding fixture and the nozzle end cover and between the welding fixture and the auxiliary oil pipe are realized by adopting an energy storage spot welding superalloy sheet lap joint positioning method. The energy storage spot welding energy is used for firmly positioning and connecting the three components.
It should be noted here that the burr positioning is equivalent to establishing a first connection between the secondary oil pipe and the nozzle end cover, while the stored energy spot welding solder ring is used for both placing the solder and using the solder as a medium to achieve a second connection of the secondary oil pipe and the nozzle end cover. And finally, the welding fixture is used for realizing the third connection of the auxiliary oil pipe and the nozzle end cover by introducing a third party.
In some embodiments, before the secondary oil pipe 2 is knocked into the nozzle end cover 1 by adopting the burr positioning mode, the method further comprises:
polishing and cleaning the position to be welded until the surface of the part is exposed with fresh metallic luster and no dirt;
polishing the position to be welded between the auxiliary oil pipe and the nozzle end cover with the nozzle until the fresh metallic luster is exposed. The parts were rinsed with clean acetone and then dried. The cleaned parts should be free of dirt and other dirt.
Preparing a brazing filler metal ring;
a certain gold-based solder with the diameter phi of 0.7mm is wound on a core rod with the diameter phi of 3.4mm to form a ring shape, and the solder is sheared by a diagonal pliers to form a solder ring with 1 circumference. The solder ring is cleaned by clean acetone and naturally dried.
In some embodiments, before the furnace-feeding vacuum brazing the auxiliary oil pipe 2 and the nozzle end cover 1, the method further comprises: detecting the position degree; under the condition that the part is provided with a welding fixture, detecting the depth of the auxiliary oil pipe inserted into the shell by adopting a fingerprint gauge, and judging whether the auxiliary oil pipe is qualified or not;
when the end face of the gauge body is positioned between the upper step face and the lower step face of the measuring rod, the gauge body can be regarded as qualified.
In some embodiments, the furnace-feeding vacuum brazing auxiliary oil pipe 2 and the nozzle end cover 1 are specifically:
according to the figure 6, the parts are stably placed on a graphite platform or a ceramic plate to enter a furnace, and are heated to 900 ℃ at a heating rate of 580-620 ℃/h under a vacuum environment, and are kept for 30-40 min;
heating to 1000-1010 ℃ at a heating rate of 430-470 ℃/h, preserving heat for 10-20 min, and brazing the parts;
finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace.
In some embodiments, after the vacuum brazing of the auxiliary oil pipe 2 and the nozzle end cover 1, the method further comprises:
cleaning a part, removing a high-temperature alloy sheet generated during assembly and positioning of the auxiliary oil pipe, taking down a welding fixture from a nozzle end cover, and self-checking the quality of a welding line, and removing the welding line by polishing if the brazing filler metal overflows, splashes and piles up on the surface of the part;
visual inspection and sealing test;
visual inspection: and carrying out visual inspection and acceptance on the brazing quality between the auxiliary oil pipe and the nozzle end cover according to the requirements of the vacuum brazing related process standard. And detecting the depth of the auxiliary oil pipe inserted into the shell by adopting a fingerprint gauge. When the end face of the gauge body is positioned between the upper step face and the lower step face of the measuring rod, the gauge body can be regarded as qualified.
Sealing test: and (3) performing a sealing test on the brazing quality between the auxiliary oil pipe and the nozzle end cover according to the related process standard requirements, and checking that no leakage exists.
Example 1
Referring to fig. 1, the embodiment shows a method for vacuum brazing an in-band tube nozzle housing, which specifically includes the following steps:
step 1, polishing and cleaning: referring to fig. 2, the polishing process is performed for the position to be welded between the sub oil pipe and the nozzle end cover with the nozzle until the fresh metallic luster is exposed. The parts were rinsed with clean acetone and then dried. The cleaned parts should be free of dirt and other dirt.
Step 2, preparing solder: a certain gold-based solder with the diameter phi of 0.7mm is wound on a core rod with the diameter phi of 3.4mm to form a ring shape, and the solder is sheared by a diagonal pliers to form a solder ring with 1 circumference. The solder ring is cleaned by clean acetone and naturally dried.
Step 3, assembling and positioning the auxiliary oil pipe and placing brazing filler metal: according to the method shown in fig. 3, a nozzle end cover with a nozzle is firstly installed on an assembly positioning clamp, so that a positioning pin can be completely inserted into a vertical hole of the nozzle end cover, and then the nozzle end cover is rotated, so that a bolt can be completely inserted into a horizontal hole of the nozzle end cover. And then, marking on the outer circular end surface of the auxiliary oil pipe far away from the welding line according to the later assembly angular position of the auxiliary oil pipe, and marking 3-4 sampling points on the to-be-welded part of the auxiliary oil pipe along the circumference, wherein the sampling points are uniformly distributed. And then, ensuring that the end surface scribing line on the auxiliary oil pipe and the two sharp point connecting lines of the indicating block on the assembly positioning fixture are positioned on the same straight line, and on the basis, knocking the auxiliary oil pipe into the nozzle end cover in a burr positioning mode, paying attention to the fact that the auxiliary oil pipe is assembled to the bottom, and tightly attaching the auxiliary oil pipe to the positioning pin on the assembly positioning fixture.
Then, 2 prepared solder rings are clamped by tweezers and sleeved on the exposed surface of the joint of the auxiliary oil pipe and the nozzle end cover, and the solder rings are fixed in an energy storage spot welding mode. The energy storage spot welding energy is used for firmly positioning the brazing filler metal ring at the position of the brazing seam to be welded.
And finally, reserving a bottom plate and a locating pin in the assembly locating clamp, removing other components in the assembly locating clamp, sleeving the welding clamp on the nozzle end cover through the auxiliary oil pipe, ensuring that the auxiliary oil pipe extends out of a middle small hole on the welding clamp, and paying attention to the fact that the welding clamp is assembled to the bottom, wherein the outer circle end face of the auxiliary oil pipe, which is far away from the welding seam side, is flush with the end face of the exposed end of the welding clamp. And then, the connection between the welding fixture and the nozzle end cover and between the welding fixture and the auxiliary oil pipe are realized by adopting an energy storage spot welding superalloy sheet lap joint positioning method. The energy storage spot welding energy is used for firmly positioning and connecting the three components.
It should be noted here that the burr positioning is equivalent to establishing a first connection between the secondary oil pipe and the nozzle end cover, while the stored energy spot welding solder ring is used for both placing the solder and using the solder as a medium to achieve a second connection of the secondary oil pipe and the nozzle end cover. And finally, the welding fixture is used for realizing the third connection of the auxiliary oil pipe and the nozzle end cover by introducing a third party.
Step 4, detecting the position degree: under the condition that the part is provided with the welding fixture, a special measuring tool, namely a finger die gauge, is adopted to detect the depth of the auxiliary oil pipe inserted into the shell. When the end face of the gauge body is positioned between the upper step face and the lower step face of the measuring rod, the gauge body can be regarded as qualified.
Step 5, vacuum brazing auxiliary oil pipes: the parts were placed on a graphite platform or ceramic plate and fed into the furnace as shown in fig. 6. Then heating to 900 ℃ at a heating rate of 600 ℃/h under a vacuum environment, and preserving heat for 35min; heating to 1005 ℃ at a heating rate of 450 ℃/h, and preserving heat for 15min to braze the part; finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace.
Step 6, cleaning parts: and (3) removing the high-temperature alloy sheet generated in the step (3) for assembling and positioning the auxiliary oil pipe by using the nipper pliers, taking down the welding fixture from the nozzle end cover, and self-checking the quality of the welding seam, wherein if the brazing filler metal overflows, splashes and piles up on the surface of the part, the brazing filler metal can be removed by polishing.
Step 7, visual inspection: and carrying out visual inspection and acceptance on the brazing quality between the auxiliary oil pipe and the nozzle end cover according to the requirements of the vacuum brazing related process standard. And detecting the depth of the auxiliary oil pipe inserted into the shell by adopting a fingerprint gauge. When the end face of the gauge body is positioned between the upper step face and the lower step face of the measuring rod, the gauge body can be regarded as qualified.
Step 8, sealing test: performing a sealing test on the brazing quality between the auxiliary oil pipe and the nozzle end cover according to the related process standard requirements, and checking that no leakage exists;
after the auxiliary oil pipe and the nozzle end cover are welded according to the steps, the brazing seam quality metallographic examination result is shown in fig. 7 and 8, and the complete process provided by the invention solves the technical problems that the welding quality of the auxiliary oil pipe, the depth dimension of the auxiliary oil pipe inserted into the shell and the angular assembly position of the auxiliary oil pipe are required to be ensured simultaneously when the auxiliary oil pipe is brazed in vacuum by a certain type of nozzle shell, ensures the smooth delivery of a certain type of gas turbine, enriches technical reserves, has important engineering reference value for processing and manufacturing similar parts, and has wide application prospect in the field of army and civil fusion conversion.
Example two
The embodiment is basically the same as the first embodiment, except that in the embodiment, the process parameters selected in the step 5 are: heating to 900 ℃ at a heating rate of 620 ℃/h under a vacuum environment, and preserving heat for 40min; heating to 1000 ℃ at a heating rate of 470 ℃/h, and preserving heat for 20min to braze the parts; finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace. The rest of the process, parameters and method are the same as in example one.
Example III
The embodiment is basically the same as the first embodiment, except that in the embodiment, the process parameters selected in the step 5 are: heating to 900 ℃ at a heating rate of 580 ℃/h under a vacuum environment, and preserving heat for 30min; heating to 1010 ℃ at a heating rate of 430 ℃/h, and preserving heat for 10min to braze the parts; finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace. The rest of the process, parameters and method are the same as in example one.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. An assembly positioning fixture, comprising: the device comprises a bottom plate (7), a locating pin (8), a bolt (9), a support (10) and an indication block (11); the support (10) is fixed on one side of the bottom plate (7), the other side of the bottom plate (7) is provided with a pin hole, one end of the locating pin (8) is inserted into the pin hole, the other end of the locating pin is inserted into a vertical hole of the nozzle end cover (1), the bolt (9) is inserted on the support (10), one end of the bolt is inserted into a horizontal hole of the nozzle end cover (1), and the indicating block (11) is arranged at the top of the support (10) and is positioned above the nozzle end cover (1).
2. A finger die gauge, characterized in that the finger die gauge comprises a gauge body (12), a measuring rod (13) and a set screw (14); the gauge body (12) is sleeved on the measuring rod (13) and is fixed by a set screw (14).
3. The welding fixture is characterized in that the welding fixture is of a nozzle base type structure adopting integrated processing, the inside of the welding fixture is hollow, and a small hole which is adapted to the auxiliary oil pipe (2) is formed in the bottom of the welding fixture.
4. A method of vacuum brazing an in-band tube nozzle housing, characterized by using a tooling according to claims 1-3 and comprising the steps of:
determining the depth value of the auxiliary oil pipe (2) inserted into the shell before welding and knocking the auxiliary oil pipe (2) into the nozzle end cover (1) in a burr positioning mode;
the exposed surface of the joint of the auxiliary oil pipe (2) and the nozzle end cover (1) is sleeved with a brazing filler metal ring and fixed by energy storage spot welding;
the welding fixture penetrates through the auxiliary oil pipe (2) and is sleeved on the nozzle end cover (1), and the welding fixture is connected with the nozzle end cover (1) and the auxiliary oil pipe (2) by adopting an energy storage spot welding superalloy sheet lap joint positioning method;
under the condition of the welding fixture, the nozzle end cover (1) is kept under the condition that the welding fixture is arranged on the upper side, and the nozzle end cover (1) and the auxiliary oil pipe (2) are vertically placed into the furnace, so that vacuum brazing connection is realized.
5. A method of vacuum brazing an in-band tube nozzle housing according to claim 4, wherein said means for locating burrs is used to drive the secondary oil tube (2) into the nozzle end cap (1), comprising:
s101: installing a nozzle end cover (1) with a nozzle on an assembly positioning clamp;
s102: marking on the outer circular end surface of the auxiliary oil pipe (2) far away from the welding line according to the later assembly angular position of the auxiliary oil pipe (2), and marking 3-4 sampling points on the part to be welded of the auxiliary oil pipe (2) along the circumference, wherein the sampling points are uniformly distributed;
s103: the end face scribing on the auxiliary oil pipe and the connecting line of two points of the indicating block on the assembly positioning fixture are ensured to be positioned on the same straight line, and the auxiliary oil pipe (2) is knocked into the nozzle end cover (1) in a burr positioning mode.
6. A method of vacuum brazing an in-band tube nozzle housing according to claim 5, wherein the welding jig is passed through the sub-tube (2) and over the nozzle end cap (1), and before the other components in the jig are removed, the base plate (7) and the locating pins (8) in the jig are retained.
7. A method of vacuum brazing an in-band tube nozzle housing according to claim 4, further comprising, prior to driving the secondary oil tube (2) into the nozzle end cap (1) by means of burr location:
polishing and cleaning the position to be welded until the surface of the part is exposed with fresh metallic luster and no dirt;
and preparing a solder ring.
8. A method of vacuum brazing an in-band tube nozzle housing according to claim 4, wherein prior to the entering vacuum brazing of the secondary oil tube (2) to the nozzle end cap (1), further comprising: detecting the position degree; and under the condition that the part is provided with the welding fixture, detecting the depth of the auxiliary oil pipe inserted into the shell by adopting a fingerprint gauge, and judging whether the auxiliary oil pipe is qualified or not.
9. The method for vacuum brazing an in-band tube nozzle housing according to claim 4, wherein the furnace-entering vacuum brazing auxiliary oil pipe (2) and the nozzle end cover (1) are specifically as follows:
heating to 900 ℃ at a heating rate of 580-620 ℃/h under a vacuum environment, and preserving heat for 30-40 min;
heating to 1000-1010 ℃ at a heating rate of 430-470 ℃/h, preserving heat for 10-20 min, and brazing the parts;
finally, the mixture is cooled to below 900 ℃ in vacuum, backfilled with argon, cooled to below 100 ℃ by an argon-fan and discharged from the furnace.
10. A method of vacuum brazing an in-band tube nozzle housing according to claim 4, further comprising, after vacuum brazing the secondary oil tube (2) to the nozzle end cap (1):
cleaning a part, removing a high-temperature alloy sheet generated during assembly and positioning of the auxiliary oil pipe, taking down a welding fixture from a nozzle end cover, and self-checking the quality of a welding line, and removing the welding line by polishing if the brazing filler metal overflows, splashes and piles up on the surface of the part;
visual inspection and sealing test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311438425.6A CN117259887A (en) | 2023-10-31 | 2023-10-31 | Method for vacuum brazing of nozzle shell with inner tube and tool used by method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311438425.6A CN117259887A (en) | 2023-10-31 | 2023-10-31 | Method for vacuum brazing of nozzle shell with inner tube and tool used by method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117259887A true CN117259887A (en) | 2023-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311438425.6A Pending CN117259887A (en) | 2023-10-31 | 2023-10-31 | Method for vacuum brazing of nozzle shell with inner tube and tool used by method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117259887A (en) |
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2023
- 2023-10-31 CN CN202311438425.6A patent/CN117259887A/en active Pending
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