CN118664150A - Manufacturing method of Laval pipe body with inner wall integrally diffusion welded - Google Patents
Manufacturing method of Laval pipe body with inner wall integrally diffusion welded Download PDFInfo
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- CN118664150A CN118664150A CN202410994341.9A CN202410994341A CN118664150A CN 118664150 A CN118664150 A CN 118664150A CN 202410994341 A CN202410994341 A CN 202410994341A CN 118664150 A CN118664150 A CN 118664150A
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 157
- 238000005493 welding type Methods 0.000 claims abstract description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 27
- 229910052786 argon Inorganic materials 0.000 claims description 24
- 238000010894 electron beam technology Methods 0.000 claims description 22
- 239000007921 spray Substances 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 15
- 238000007747 plating Methods 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 229910052709 silver Inorganic materials 0.000 claims description 10
- 239000004332 silver Substances 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N Acetylene Chemical compound C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 description 11
- 230000006872 improvement Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 229920000426 Microplastic Polymers 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- PQJKKINZCUWVKL-UHFFFAOYSA-N [Ni].[Cu].[Ag] Chemical compound [Ni].[Cu].[Ag] PQJKKINZCUWVKL-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention relates to a manufacturing method of an inner wall integrated diffusion welding type Laval pipe body part, which comprises an inner wall, an outer wall component and an inner sheath component; the outer wall assembly comprises an outer wall front section, an outer wall rear section, an outer wall upper middle section and an outer wall lower middle section, and the inner sheath assembly comprises a front inner sheath and a rear inner sheath. The inner wall is integral, the outer wall is segmented, and the welding tool is omitted, so that the time and the manufacturing cost are saved. The invention can improve the welding quality in an isobaric welding mode and avoid the welding quality problem caused by welding dent and instability.
Description
Technical Field
The invention relates to the related technical field of Laval pipe production and processing, in particular to a manufacturing method of a Laval pipe body part with an integrally diffusion welded inner wall.
Background
Laval pipe is also called as spray pipe or zoom pipe, and has a certain shape of contracted-expanded inner cavity, after the high-pressure gas flowing through Laval pipe is contracted and expanded again, stable laminar flow can be formed, and its flow rate can be up to supersonic speed.
The existing Laval pipe body manufacturing method generally comprises the following three modes:
1. the existing body is provided with the diffusion welding of the inner wall and the outer wall in a segmented mode, and electron beam welding is needed in the technology, so that the technology is complex.
2. The method can only use a die for pressurizing and diffusion welding, and has high cost.
3. The inner wall and the outer wall are integrally welded by diffusion, the outer wall is heavy, an excessively segmented outer wall is added, the use is limited, and the cost is increased more.
In view of the above-mentioned drawbacks, the present inventors have actively studied and innovated to create a method for manufacturing a Laval pipe body with an integrated diffusion welding type inner wall, which is more industrially useful.
Disclosure of Invention
In order to solve any of the above technical problems, the present invention is directed to a manufacturing method of a Laval pipe body with an integrated diffusion welding inner wall.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a manufacturing method of an inner wall integrated diffusion welding type Laval pipe body part comprises the steps of inner wall, outer wall components and inner sheath components;
The outer wall assembly comprises an outer wall front section, an outer wall rear section, an outer wall upper middle section and an outer wall lower middle section, and the inner sheath assembly comprises a front inner sheath and a rear inner sheath;
The manufacturing method sequentially comprises the following steps:
s1, sleeving the front section of the outer wall into the front end of the inner wall, and sleeving the rear section of the outer wall into the rear end of the inner wall;
s2, sleeving the upper middle section of the outer wall into the upper end of the middle part of the inner wall, and sleeving the lower middle section of the outer wall into the lower end of the middle part of the inner wall;
s3, welding the outer wall assembly and the inner wall to form a spray pipe assembly through electron beam welding;
s4, inserting a front inner sheath into the inner side of the front end of the spray pipe assembly, and inserting a rear inner sheath into the inner side of the rear end of the spray pipe assembly;
S5, welding the spray pipe assembly, the inner sheath assembly and the exhaust pipe together through argon arc welding;
And S6, vacuumizing through an exhaust pipe and performing air pressure diffusion welding.
As a further improvement of the present invention, in step S3, a first electron beam circumferential gap is provided between the rear end of the outer wall front section and the front ends of the outer wall upper middle section and the outer wall lower middle section, respectively; a second electron beam circumferential seam is arranged between the front end of the rear section of the outer wall and the rear ends of the upper middle section and the lower middle section of the outer wall respectively; and a third electron beam circumferential seam is arranged between the upper middle section of the outer wall and the lower middle section of the outer wall.
As a further improvement of the present invention, in step S5, a first argon arc welding circumferential seam is provided between the front end of the front inner sheath and the front inner side of the nozzle assembly; a second argon arc welding circular seam is arranged between the rear end of the front inner sheath and the front end of the rear inner sheath; a third argon arc welding circular seam is arranged between the rear end of the rear inner sheath and the inner side of the rear end of the spray pipe assembly; a fourth argon arc welding circular seam is arranged between the outer side of the front end of the spray pipe assembly and the bottom of the exhaust pipe; a fourth argon arc welding circular seam is arranged between the outer side of the rear end of the spray pipe assembly and the bottom of the exhaust pipe.
As a further improvement of the present invention, in step S6, the gas pressure diffusion welding is performed by means of isobaric welding, i.e. the welding pressure is the same at each welding site.
As a further development of the invention, in step S6, a transition region is provided on the inner jacket assembly, i.e. the size of the weld-point wall thickness is proportional to the size of the weld-point diameter.
As a further improvement of the invention, in the step S6, the temperature of the gas pressure diffusion welding is 900-1000 ℃, the welding pressure is 0.3-0.5 MPa, and the welding time is 45-90 min.
As a further improvement of the invention, in the step S6, the temperature rising rate and the temperature reducing rate of the air pressure diffusion welding are less than 5-10 ℃/min.
As a further improvement of the present invention, in step S6, a silver plating layer of 0.003 to 0.01mm is coated on the inner wall, and a copper plating layer of 0.003 to 0.01mm is coated on the surface of the silver plating layer; the inner side of the outer wall component is coated with a nickel plating layer with the thickness of 0.003-0.01 mm.
As a further improvement of the invention, in step S1 and step S2, the assembly gap between the outer wall assembly and the inner wall is 0.02-0.04 mm on one side.
As a further improvement of the present invention, in step S4, the gap between the inner jacket assembly and the inner wall is 0.2mm on one side.
By means of the scheme, the invention has at least the following advantages:
The inner wall is integral, the outer wall is segmented, and the welding tool is omitted, so that the time and the manufacturing cost are saved.
The invention can improve the welding quality in an isobaric welding mode and avoid the welding quality problem caused by welding dent and instability.
The invention can not only improve the strength of the welding surface but also improve the plasticity through the silver-copper-nickel composite plating layer.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the outer wall front section, outer wall rear section and inner wall of the present invention in a disassembled configuration;
FIG. 2 is a schematic view of the assembled structure of the front section of the outer wall, the rear section of the outer wall and the inner wall of the present invention;
FIG. 3 is a schematic view of an assembly structure of an upper middle section of an outer wall and a lower middle section of the outer wall with an inner wall in the present invention;
FIG. 4 is a schematic view of the welding of the nozzle assembly of the present invention;
FIG. 5 is a schematic view of the nozzle assembly, front inner sheath and rear inner sheath of the present invention in a disassembled configuration;
FIG. 6 is a schematic view of argon arc welding of the nozzle assembly, front inner sheath and rear inner sheath of the present invention;
FIG. 7 is a schematic view of a gas pressure diffusion welding process for the nozzle assembly, front inner wrapper and rear inner wrapper of the present invention;
FIG. 8 is a schematic view of the welding pressure at the weld site in the present invention;
FIG. 9 is a schematic view of the wall thickness of a weld in the present invention;
FIG. 10 is a first schematic illustration of the weld spot diameter to wall thickness ratio of the present invention;
FIG. 11 is a second schematic illustration of the weld spot diameter to wall thickness ratio in accordance with the present invention;
FIG. 12 is a first schematic view of the present invention with a weld of equal thickness and thinness;
FIG. 13 is a second schematic view of the present invention with a weld of equal thickness and thinness;
FIG. 14 is a first schematic view of the present invention with a weld of equal thickness and thinness;
Fig. 15 is a second schematic view of the present invention with a weld portion having a uniform thickness and a thin wall thickness.
In the drawings, the meaning of each reference numeral is as follows.
The welding device comprises an outer wall front section 1, an outer wall rear section 2, an inner wall 3, an outer wall upper middle section 4, an outer wall lower middle section 5, a first electron beam circumferential seam 6, a second electron beam circumferential seam 7, a third electron beam circumferential seam 8, a spray pipe combination 9, a front inner sheath 10, a rear inner sheath 11, an exhaust pipe 12, a first argon arc welding circumferential seam 13, a second argon arc welding circumferential seam 14, a third argon arc welding circumferential seam 15, a fourth argon arc welding circumferential seam 16, an outer wall 17, a theoretical equal wall thickness line 18, a gradual change area 19, welding pressure P, welding part diameter D, welding part wall thickness t and yield strength sigma of welding materials at high temperature.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Examples
As shown in figures 1 to 15 of the drawings,
The manufacturing approach of a inner wall integrative diffusion welding type Laval pipe body, laval pipe body includes inner wall 3, outer wall assembly 17 and inner sheath assembly;
the outer wall assembly 17 comprises an outer wall front section 1, an outer wall rear section 2, an outer wall upper middle section 4 and an outer wall lower middle section 5, and the inner sheath assembly comprises a front inner sheath 10 and a rear inner sheath 11;
The manufacturing method sequentially comprises the following steps:
Step S1, sleeving the front section 1 of the outer wall into the front end of the inner wall 3, and sleeving the rear section 2 of the outer wall into the rear end of the inner wall 3.
Step S2, sleeving the upper middle section 4 of the outer wall into the upper end of the middle part of the inner wall 3, and sleeving the lower middle section 5 of the outer wall into the lower end of the middle part of the inner wall 3.
In step S1 and step S2, the assembly gap between the outer wall assembly 17 and the inner wall 3 is 0.02 to 0.04mm on one side.
And S3, welding the outer wall assembly 17 and the inner wall 3 to form the spray pipe assembly 9 through electron beam welding.
In step S3, a first electron beam circumferential seam 6 is provided between the rear end of the outer wall front section 1 and the front ends of the outer wall upper middle section 4 and the outer wall lower middle section 5, respectively;
a second electron beam circumferential seam 7 is arranged between the front end of the outer wall rear section 2 and the rear ends of the outer wall upper middle section 4 and the outer wall lower middle section 5 respectively;
A third electron beam circumferential gap 8 is arranged between the upper middle section 4 of the outer wall and the lower middle section 5 of the outer wall.
Step S4, inserting the front inner sheath 10 into the front inner side of the nozzle assembly 9, and inserting the rear inner sheath 11 into the rear inner side of the nozzle assembly 9.
In step S4, the gap between the inner jacket assembly and the inner wall 3 is 0.2mm on one side.
And S5, welding the spray pipe assembly 9, the inner sheath assembly and the exhaust pipe 12 together through argon arc welding.
In step S5, a first argon arc welding circumferential seam 13 is provided between the front end of the front inner sheath 10 and the front inner side of the nozzle assembly 9;
A second argon arc welding circular seam 14 is arranged between the rear end of the front inner sheath 10 and the front end of the rear inner sheath 11;
a third argon arc welding circular seam 15 is arranged between the rear end of the rear inner sheath 11 and the inner side of the rear end of the spray pipe assembly 9;
A fourth argon arc welding circular seam 16 is arranged between the outer side of the front end of the spray pipe assembly 9 and the bottom of the exhaust pipe 12;
A fourth argon arc welding circular seam 16 is arranged between the outer side of the rear end of the spray pipe combination body 9 and the bottom of the exhaust pipe 12.
And S6, vacuumizing through the exhaust pipe 12 and performing air pressure diffusion welding.
In step S6, the gas pressure diffusion welding is performed by an isobaric welding method, that is, the welding pressure P is the same at each welding portion.
In step S6, the inner jacket assembly is provided with a transition region 19, i.e. the size of the weld zone wall thickness t is proportional to the size of the weld zone diameter D.
In the step S6, the temperature of the gas pressure diffusion welding is 900-1000 ℃, the welding pressure is 0.3-0.5 MPa, and the welding time is 45-90 min.
In the step S6, the temperature rising rate and the temperature reducing rate of the air pressure diffusion welding are less than 5-10 ℃/min.
In step S6, a silver coating layer of 0.003-0.01 mm is coated on the inner wall 3, and a copper coating layer of 0.003-0.01 mm is coated on the surface of the silver coating layer; the inner side of the outer wall assembly 17 is coated with a nickel plating of 0.003-0.01 mm.
First embodiment of the present invention:
The overall scheme is as follows: the body part is formed by welding an inner wall and an outer wall, materials are different, the inner wall is generally made of copper, and the outer wall is made of stainless steel or high-temperature alloy or heat-resistant alloy. The throat temperature is relatively high when the body is used, so the scheme is designed to avoid the occurrence of welding seams on the inner wall.
The inner wall is whole, and the outer wall divide into three sections, and preceding, well, back, and the middle section divide into upper and lower, and the outer wall is divided into 4 parts (namely outer wall anterior segment 1, outer wall back end 2, outer wall upper middle section 4 and outer wall lower middle section 5), and the main objective is convenient assembling.
Meanwhile, after the outer wall is segmented, the whole outer wall is required to be welded before diffusion welding, and the whole outer wall and the whole sheath are welded to form an interlayer capable of vacuumizing (the inner wall is clamped between the outer wall and the sheath), and the welding can be performed through the pressure application of internal and external air pressure.
The process steps of the invention are briefly described:
1. The outer wall rear section 1 is assembled and the outer wall front section 2 is assembled.
2. Middle section 4 on the outer wall of the assembly and an outer wall lower middle section.
3. The electron beam welded outer wall is integral (i.e., the nozzle assembly 9) and includes 2 annular slits (i.e., the first electron beam annular slit 6 and the second electron beam annular slit 7) and 2 intermediate slits (i.e., the third electron beam annular slit 8).
4. The front inner sheath 10 and the rear inner sheath 11 are assembled.
5. And welding the front inner sheath and the rear inner sheath by argon arc welding.
6. And (5) performing gas pressure diffusion welding.
7. Removing the sheath, detecting the functions of hydraulic pressure and the like, and welding parts such as a flange, a collector and the like.
The invention relates to an air pressure diffusion welding method, which is characterized in that a diffusion welding product is placed in diffusion welding equipment, and the equipment is used for realizing the processes of pressurization, heating and cooling, so that the welding of the product is realized, and unlike the traditional diffusion welding, the traditional welding has a certain micro plastic deformation to ensure that the whole welding surface has no defects of hollowness, non-welding and the like. The diffusion welding equipment can be vacuumized to the furnace chamber to realize the gas pressure of welding, can charge inert gas into the equipment, can maintain pressure, can vacuumize products, and ensures that the welding surface has no air in the welding process.
Because the products and the tools are not in a thin-wall state in the welding process, gas heat conduction is adopted at the same time, and therefore the temperature rise and the temperature drop of welding are faster. No micro plastic deformation exists in the air pressure welding process, so that an intermediate layer is required to be added in the welding process of the metal material with inactive material, so that the diffusion welding strength is improved.
Silver with the thickness of 0.003-0.01 mm is added into the inner wall of the body of stainless steel and copper with the thickness of 0.003-0.01 mm is added into the surface of the silver plating layer, nickel with the thickness of 0.003-0.01 mm is added into the inner side of the outer wall of the body, and the welding strength and plasticity are improved through the composite plating layer. Nickel and copper are infinitely miscible, so that the outer side of the inner wall of the copper is plated with silver to increase the binding force, and the surface of the silver is plated with copper again, because the mutual diffusion coefficient of the copper and the nickel is higher, and the inner side of the outer wall is plated with nickel by comprehensively considering the equivalent diameters of nickel atoms and iron atoms, so that the copper can be well diffused. The strength of the welding surface and the plasticity can be improved by the silver-copper-nickel composite coating.
The gas pressure diffusion welding has no micro plastic deformation, so that two welding surfaces must be infinitely close, the plating layers are mutually diffused to form a stable solid solution layer, the formation of a low-melting eutectic and an intermetallic compound layer is avoided, the plasticity valence of the intermetallic compound is poor, the strength is high, the low-melting eutectic, the melting point is low, and the plasticity is poor, so that the two methods are not hoped for diffusion welding or other welding means.
The inner wall is integrated with the copper body, the air pressure diffusion welding temperature is 900-1000 ℃, the welding air pressure is 0.3-0.5 MPa, and the welding time is 45-90 min. In order to avoid the occurrence of shearing force during welding, the heating rate and the cooling rate are less than 5-10 ℃/min.
Wherein the technical design key points are briefly described as follows:
1. Assembly gap: single side 0.02-0.04 mm.
2. The electron beam welds the middle section longitudinal seam, the slit is aligned with the inner wall groove.
3. The gap between the sheath and the inner wall is unilateral: 0.2mm.
4. And welding the electron beam welding curve, and adopting an automatic lifting program to ensure the consistent welding depth.
5. Inner wall inner side margin: 0.5mm, post-weld finish.
6. Axial length allowance: one side is 40-80 mm.
7. The thickness of the sheath is excessive, and the isobaric welding is realized.
8. And (3) stopping welding of the non-welding area.
The following is an explanation of the working principle of the diffusion welding:
The whole inner wall reduces the probability of inner wall damage in the ignition process. The diameter of the throat is reduced, the flow speed is increased, the pressure of the throat is reduced, the pressure of the throat is lower, but the flow speed is higher, the inner wall is eroded, if a welding joint is arranged at the throat, the welding part is broken due to the growth of crystal grains in the welding process, so that the welding joint has lower strength than a welding joint, and the erosion resistance is weak.
And the equal pressure welding is performed, so that the diffusion quality is improved. Although the gas pressure of the gas pressurizing diffusion welding is equal, the stress of the product structure is unequal, namely the stress of the unit area is different.
The theoretical basis is: p= 2*t ×σ.
Where P is the welding pressure, D is the diameter of the welded portion of the body, t is the wall thickness of the welded portion, and σ is the yield strength of the welding material at high temperature.
The axial direction of the body has the condition of different diameters, so the stress of each place is different, and more areas with small diameters are needed. Structurally, the wall thickness t can be adjusted only to ensure that the pressure per unit area received for each diameter is equal.
The small diameter region overcomes the large yield force of the material, and the rest is diffusion welding pressurizing pressure.
The areas with large diameters overcome the small yield force of the material, and the rest is the diffusion welding pressurizing pressure.
In order to ensure that the stress of the areas with large diameter and small diameter is always applied, the inner sheath wall thickness can be adjusted only.
Welding pressure for large diameter areas:
Welding pressure in small-diameter areas:
From the two relationships being equal, we find:
As shown in fig. 10 and 11, that is, the region with a large diameter needs to have a large thickness and the region with a small diameter needs to have a small thickness.
If the wall thickness of the large diameter is the same as the wall thickness of the small diameter (i.e., the theoretical equal wall thickness line 18 in fig. 9), as shown in fig. 12 and 13, assuming that the welding pressure is just the same in the region of the small diameter, the rib instability of the inner wall is liable to occur due to the increase in the welding pressure caused by the decrease in the wall thickness of the large diameter.
As shown in fig. 14 and 15, the large-diameter region is as thin as the small-diameter region, and the rib is liable to be unstable and dented, both of which are present at the same time. The instability and the dent are both related to the welding pressure, so that the wall thickness and the pressure can be in a stable and good state by means of simulation technology and test, and the welding strength can be met.
The invention has obvious effect of welding the body part with large diameter difference and the body part with copper inner wall. It is possible that the welded inner and outer walls are both of a high temperature alloy or heat resistant steel and the like.
The key point of the invention is that the variable wall thickness sheathing process (i.e. the gradual change region 19 in fig. 9) ensures the welding quality:
Namely, the problem of product quality caused by dishing and instability of the diffusion welding process due to thermal creep of materials is solved through wall thickness, temperature and pressure.
The invention provides a high-quality welding method for gas pressure diffusion welding.
The invention has the advantages that the whole inner wall and the whole outer wall are segmented, and the welding tool is omitted, so that the time and the manufacturing cost are saved.
The invention improves the welding quality through isobaric welding and avoids the problem of welding quality caused by welding concave and instability.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or communicating between the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (10)
1. The manufacturing method of the Laval pipe body part with the integrated diffusion welding inner wall comprises the steps of forming a Laval pipe body part with the integrated diffusion welding inner wall (3), an outer wall assembly (17) and an inner sheath assembly;
The method is characterized in that:
The outer wall assembly (17) comprises an outer wall front section (1), an outer wall rear section (2), an outer wall upper middle section (4) and an outer wall lower middle section (5), and the inner sheath assembly comprises a front inner sheath (10) and a rear inner sheath (11);
the manufacturing method sequentially comprises the following steps:
Step S1, sleeving the outer wall front section (1) into the front end of the inner wall (3), and sleeving the outer wall rear section (2) into the rear end of the inner wall (3);
S2, sleeving the upper middle section (4) of the outer wall into the upper end of the middle part of the inner wall (3), and sleeving the lower middle section (5) of the outer wall into the lower end of the middle part of the inner wall (3);
S3, welding the outer wall assembly (17) and the inner wall (3) to form a spray pipe assembly (9) through electron beam welding;
S4, inserting the front inner sheath (10) into the inner side of the front end of the spray pipe assembly (9), and inserting the rear inner sheath (11) into the inner side of the rear end of the spray pipe assembly (9);
s5, welding the spray pipe assembly (9), the inner sheath assembly and the exhaust pipe (12) together through argon arc welding;
And S6, vacuumizing through the exhaust pipe (12) and performing air pressure diffusion welding.
2. The method for manufacturing a Laval pipe body with integrated diffusion welding on an inner wall according to claim 1, wherein in the step S3, a first electron beam circumferential gap (6) is arranged between the rear end of the front section (1) of the outer wall and the front ends of the upper middle section (4) and the lower middle section (5) of the outer wall, respectively; a second electron beam circumferential seam (7) is arranged between the front end of the outer wall rear section (2) and the rear ends of the outer wall upper middle section (4) and the outer wall lower middle section (5) respectively; a third electron beam circumferential seam (8) is arranged between the upper middle section (4) of the outer wall and the lower middle section (5) of the outer wall.
3. The method for manufacturing the inner wall integrated diffusion welding type Laval pipe body according to claim 1, wherein in the step S5, a first argon arc welding circular seam (13) is arranged between the front end of the front inner sheath (10) and the inner side of the front end of the spray pipe assembly (9); a second argon arc welding circular seam (14) is arranged between the rear end of the front inner sheath (10) and the front end of the rear inner sheath (11); a third argon arc welding circular seam (15) is arranged between the rear end of the rear inner sheath (11) and the inner side of the rear end of the spray pipe assembly (9); a fourth argon arc welding circular seam (16) is arranged between the outer side of the front end of the spray pipe assembly (9) and the bottom of the exhaust pipe (12); a fourth argon arc welding circular seam (16) is arranged between the outer side of the rear end of the spray pipe assembly (9) and the bottom of the exhaust pipe (12).
4. The method for manufacturing an inner wall integrated diffusion welded type Laval pipe body according to claim 1, wherein in the step S6, the gas pressure diffusion welding adopts an isobaric welding mode, namely, the welding pressure (P) at each welding position is the same.
5. The method for manufacturing an inner wall integrated diffusion welded type Laval pipe body according to claim 4, wherein in the step S6, a gradual change region (19) is provided on the inner sheath member, that is, the size of the welding portion wall thickness (t) is proportional to the size of the welding portion diameter (D).
6. The method for manufacturing a Laval pipe body with integrated diffusion welding type inner wall according to claim 4, wherein in the step S6, the temperature of the gas pressure diffusion welding is 900-1000 ℃, the welding gas pressure is 0.3-0.5 MPa, and the welding time is 45-90 min.
7. The method for manufacturing a Laval pipe body with integrated diffusion welding type inner wall according to claim 4, wherein in the step S6, the temperature rising rate and the temperature lowering rate of the gas pressure diffusion welding are less than 5-10 ℃/min.
8. The method for manufacturing an inner wall integrated diffusion welded type Laval pipe body according to claim 4, wherein in the step S6, a silver plating layer of 0.003-0.01 mm is coated on the inner wall (3), and a copper plating layer of 0.003-0.01 mm is coated on the surface of the silver plating layer; the inner side of the outer wall component (17) is coated with a nickel plating layer with the thickness of 0.003-0.01 mm.
9. The method for manufacturing a Laval pipe body with integrated diffusion welding on an inner wall according to claim 1, wherein in the step S1 and the step S2, the assembly gap between the outer wall assembly (17) and the inner wall (3) is 0.02-0.04 mm on one side.
10. The method for manufacturing a Laval pipe body with integrated diffusion welding on an inner wall according to claim 1, wherein in the step S4, the single side of the gap between the inner sheath assembly and the inner wall (3) is 0.2mm.
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| CN202410994341.9A CN118664150A (en) | 2024-07-24 | 2024-07-24 | Manufacturing method of Laval pipe body with inner wall integrally diffusion welded |
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| CN202410994341.9A CN118664150A (en) | 2024-07-24 | 2024-07-24 | Manufacturing method of Laval pipe body with inner wall integrally diffusion welded |
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