CN114192961A - Method for gas pressurization diffusion welding of thin-wall micro-channel heat exchanger core - Google Patents
Method for gas pressurization diffusion welding of thin-wall micro-channel heat exchanger core Download PDFInfo
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- CN114192961A CN114192961A CN202111560814.7A CN202111560814A CN114192961A CN 114192961 A CN114192961 A CN 114192961A CN 202111560814 A CN202111560814 A CN 202111560814A CN 114192961 A CN114192961 A CN 114192961A
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- Prior art keywords
- heat exchanger
- welding
- exchanger core
- diffusion welding
- thin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
- B23K20/026—Thermo-compression bonding with diffusion of soldering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools, brushes, or analogous members
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
Abstract
The invention provides a method for gas pressurization diffusion welding of a core body of a thin-wall micro-channel heat exchanger, which comprises the following steps: s1, wiping to remove oil stains on the plate, washing with clear water, and drying the plate; s2, spot welding is carried out from the joint positions of the peripheries of the upper plate and the lower plate, so that the two plates form the heat exchanger core body; s3, welding the upper end face of the heat exchanger core body in the step S2 to form a closed cavity inside the heat exchanger core body; s4, diffusion welding the heat exchanger core body in the step S3, wherein the vacuum degree is 1 multiplied by 10‑2Pa below; s5, cutting off the welding seams and the areas outside the welding seams in the step S3, and performing finish machining to obtain the finished product micro-channel heat exchanger core body, wherein the welding quantity in the same furnace is large and only the periphery of a part needs to be sealed without using a tool, and the temperature can be controlled and the welding can be realized by using the methodThe piece is controllable in compression and deformation of the weldment.
Description
Technical Field
The invention belongs to the field of diffusion welding, and particularly relates to a gas pressurization diffusion welding method for a thin-wall micro-channel heat exchanger core.
Background
The heat exchanger is mainly applied to the production of power, food, energy, ships, chemical industry and other industries, when the part works, the fluid with higher temperature is transferred to the fluid with lower temperature, so that the temperature of the fluid reaches the index specified by the process, the requirement of process conditions is met, the energy utilization rate is improved, and therefore, the heat exchanger has important significance in reducing the production cost of the heat exchanger while improving the performance of the heat exchanger;
in the processing and manufacturing process of the thin-wall double-layer plate type micro-channel heat exchanger, two methods are commonly adopted in the industry, one method is a superposition brazing process, but the performance is poor under the high-temperature and high-pressure service condition, and the other method is a mechanical pressure diffusion welding process, so that the performance is good under the high-temperature and high-pressure service condition;
diffusion welding is to press two workpieces to be welded together under the condition of heating in vacuum or protective atmosphere, so that microscopic plastic deformation is generated on the tiny unevenness of the surfaces of the two workpieces to be welded to achieve close contact, in the subsequent heating and heat preservation, the mutual diffusion among atoms forms the metallurgical connection, although the diffusion welding has high requirements on the surface quality of the workpieces to be welded and has long welding time, but has the advantages of small plastic deformation of the whole welded part, good joint quality and high strength, but has the defects of uneven pressure, uncontrollable deformation and the like in the welding process, and needs to be completed with the assistance of a tool in the welding process, under the condition of the temperature of the stainless steel diffusion welding, the clamping pressure of the tool is unstable, the tool has great influence on the temperature rising and falling speed and the temperature uniformity of the diffusion welding, and the welding defects are easily generated to cause the yield reduction;
based on the above, solving the defects existing in the diffusion welding process has become an urgent problem to be solved, so a gas pressure diffusion welding method for a thin-wall micro-channel heat exchanger core is designed.
Disclosure of Invention
In view of this, the present invention aims to provide a gas pressurization diffusion welding method for a thin-wall microchannel heat exchanger core, so as to solve the problems of non-uniform pressure and uncontrollable deformation during the welding process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for gas pressurization diffusion welding of a thin-wall micro-channel heat exchanger core comprises the following steps:
s1, wiping to remove oil stains on the plates, washing the plates with clear water, drying the plates, and stacking the plates two by two;
s2, aligning and positioning the stacked upper and lower plates to enable the semicircular hole structures between the upper and lower plates to correspond and then combine into a circular hole, and then performing spot welding from the joint positions around the upper and lower plates to enable the two plates to form a heat exchanger core;
s3, welding the upper end face of the heat exchanger core body in the step S2 to form a closed cavity inside the heat exchanger core body;
s4, putting a plurality of groups of heat exchanger cores in the step S3 into diffusion welding equipment together for diffusion welding, wherein the degree of vacuum of the diffusion welding is 1 multiplied by 10-2Pa below, and the specific diffusion welding process is：
S41, heating to 400-450 ℃ within 1h, and preserving heat for 0.5 h;
s42, heating to 800-850 ℃ for 2h, and keeping the temperature for 0.5 h;
s43, heating to 1100-;
s44, reducing the gas pressure to 4-5MPa, cooling along with the furnace, pressurizing and closing the gas when the temperature is lower than 150 ℃, opening the diffusion welding equipment, and cooling in air;
and S5, cutting off the welding seams and the outward areas of the welding seams in the step S3, and performing finish machining to obtain the finished product of the microchannel heat exchanger core.
Further, in step S1, the soft cloth without depilation is dipped in the degreasing agent aqueous solution for wiping to remove oil.
Further, in step S1, the drying method is high pressure air drying.
Further, in step S1, the dried boards are placed on kraft paper, and the boards placed on top of each other are separated by the kraft paper.
Further, in step S2, the upper and lower panels that are stacked two by two are aligned in the following manner: and the upper and lower plates are aligned up and down by adopting a square box on the assembly platform to complete positioning.
Further, in step S2, the upper and lower panels that are stacked two by two are aligned in the following manner: and the upper plate and the lower plate are aligned up and down by adopting a positioning pin on the assembly platform to complete positioning.
Further, the kraft paper between the sheets is taken out before spot welding in step S2.
Further, in step S2, the spot welding method is argon arc welding, and the welding points are distributed as 1 to 2 welding points per edge.
Further, in step S3, the heat exchanger core in step S2 is welded by: and (5) putting the whole heat exchanger core body in the step (S2) into an electron beam welding device, and welding by using an electron beam, wherein the electron beam is completed in a vacuum environment.
Further, in step S3, the width of the electron beam welded bead should not be greater than 5 mm.
Compared with the prior art, the invention has the beneficial effects that: the method has the advantages that the tool is not used, the welding quantity in the same furnace is large, and only the periphery of the part needs to be tightly sealed, and the method can realize controllable temperature, controllable pressure of the weldment and controllable deformation of the weldment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a heat sink plate of a microchannel heat exchanger according to the present invention;
FIG. 2 is a schematic view of a heat exchanger core according to the present invention;
FIG. 3 is a schematic view of the electron beam welded weld locations of the heat exchanger core of the present invention;
FIG. 4 is a schematic view of the thin-wall micro-channel heat exchanger of the present invention performing gas pressure diffusion welding in the inner cavity of a vacuum diffusion welding furnace.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.
The invention is explained in detail below with reference to the figures and with reference to embodiments.
A method for gas pressurization diffusion welding of a thin-wall micro-channel heat exchanger core body specifically comprises the following steps:
s1, wiping the oil stain on the board sheet by using a soft cloth without depilation to dip an oil removing agent aqueous solution, drying the board sheet after the board sheet is washed clean by clear water, wherein the drying mode is high-pressure air blowing drying, the thickness of the board sheet is 1.5mm, the length of the board sheet is 1070mm, and the width of the board sheet is 540mm, stacking the board sheets two by two, placing the dried board sheets on kraft paper, and separating the two stacked board sheets by the kraft paper to form a plurality of groups of stacked board sheets;
s2, aligning and positioning stacked upper and lower plates, combining the upper and lower plates into a circular hole after the semicircular hole structures correspond to each other, spot-welding the upper and lower plates from the peripheral joint parts, forming the two plates into a group of heat exchanger cores, repeatedly aligning and spot-welding other stacked upper and lower plates to finally obtain a plurality of groups of heat exchanger cores, wherein the aligning and positioning modes of the two stacked upper and lower plates are as follows: the upper and lower plates are vertically aligned by a square box on an assembly platform to complete positioning, or the upper and lower plates are vertically aligned by a positioning pin on the assembly platform to complete positioning, kraft paper between the upper and lower plates which are stacked in pairs needs to be drawn out before positioning and spot welding, the spot welding mode is to use argon arc welding to perform spot welding, and the distribution of welding spots is 1-2 welding spots on each edge of the periphery of the upper and lower plates;
s3, welding the upper end face of each group of heat exchanger core body in the step S2 to form a closed cavity inside the heat exchanger core body, specifically, putting the whole heat exchanger core body in the step S2 into electron beam welding equipment, and welding the periphery of the upper end face of the heat exchanger core body in the step S2 by using electron beams, wherein the electron beams are completed in a vacuum environment, and the width of a welding seam of the electron beam welding is not more than 5 mm;
s4, putting a plurality of groups of heat exchanger cores in the step S3 into diffusion welding equipment together for diffusion welding, wherein the number of the groups of the heat exchanger cores ranges from 1 to 15, and the degree of vacuum of the diffusion welding is 1 multiplied by 10-2Pa is carried out as follows, and the specific diffusion welding process is as follows:
s41, heating to 400-450 ℃ within 1h, and preserving heat for 0.5 h;
s42, heating to 800-850 ℃ for 2h, and keeping the temperature for 0.5 h;
s43, heating to 1100-;
s44, reducing the gas pressure to 4-5MPa, cooling along with the furnace, pressurizing and closing the gas when the temperature is lower than 150 ℃, opening the diffusion welding equipment, and cooling in air;
and S5, cutting off the welding seams and the outward areas of the welding seams in the step S3, and performing finish machining to obtain a finished product micro-channel heat exchanger core body with the size of 970 multiplied by 440 mm.
Compared with mechanical pressure diffusion welding, the invention has the advantages and positive effects that:
the invention intends to adopt a gas pressurization mode to carry out diffusion welding connection on the metal plate, the upper plate and the lower plate are tightly sealed by electron beam welding, the welding environment of the electron beam welding is carried out under vacuum, the problem of gas existing between the upper plate and the lower plate is solved, and the quality of a welding joint of subsequent diffusion welding is improved; and secondly, a welding tool is omitted in a gas pressurization welding mode, so that the deformation problem is solved while the production cost is reduced, the welding quality problem caused by the tool in production is also reduced, and the method is also suitable for gas pressurization diffusion welding of the core body of the multi-layer micro-channel heat exchanger.
The embodiments of the invention disclosed above are intended merely to aid in the explanation of the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention.
Claims (10)
1. A method for gas pressurization diffusion welding of a thin-wall micro-channel heat exchanger core is characterized by comprising the following steps: the method comprises the following steps:
s1, wiping to remove oil stains on the plates, washing the plates with clear water, drying the plates, and stacking the plates two by two;
s2, aligning and positioning the stacked upper and lower plates to enable the semicircular hole structures between the upper and lower plates to correspond and then combine into a circular hole, and then performing spot welding from the joint positions around the upper and lower plates to enable the two plates to form a heat exchanger core;
s3, welding the upper end face of the heat exchanger core body in the step S2 to form a closed cavity inside the heat exchanger core body;
s4, combining a plurality of groups of heat exchanger cores in the step S3Placing into diffusion welding equipment for diffusion welding under vacuum degree of 1 × 10-2Pa is carried out as follows, and the specific diffusion welding process is as follows:
s41, heating to 400-450 ℃ within 1h, and preserving heat for 0.5 h;
s42, heating to 800-850 ℃ for 2h, and keeping the temperature for 0.5 h;
s43, heating to 1100-;
s44, reducing the gas pressure to 4-5MPa, cooling along with the furnace, pressurizing and closing the gas when the temperature is lower than 150 ℃, opening the diffusion welding equipment, and cooling in air;
and S5, cutting off the welding seams and the outward areas of the welding seams in the step S3, and performing finish machining to obtain the finished product of the microchannel heat exchanger core.
2. The method for gas pressure diffusion welding of the thin-wall microchannel heat exchanger core as recited in claim 1, wherein: in step S1, a soft cloth without depilation is dipped in the degreasing agent aqueous solution for wiping to remove oil.
3. The method for gas pressure diffusion welding of the thin-wall microchannel heat exchanger core as recited in claim 1, wherein: in step S1, the drying method is high-pressure air drying.
4. The method for gas pressure diffusion welding of the thin-wall microchannel heat exchanger core as recited in claim 1, wherein: in step S1, the dried boards are placed on kraft paper, and the boards placed in pairs are separated by kraft paper.
5. The method for gas pressure diffusion welding of a thin-walled microchannel heat exchanger core as recited in any one of claims 1 to 4, wherein: in step S2, the upper and lower sheets stacked two by two are aligned in the following manner: and the upper and lower plates are aligned up and down by adopting a square box on the assembly platform to complete positioning.
6. The method for gas pressure diffusion welding of a thin-walled microchannel heat exchanger core as recited in any one of claims 1 to 4, wherein: in step S2, the upper and lower sheets stacked two by two are aligned in the following manner: and the upper plate and the lower plate are aligned up and down by adopting a positioning pin on the assembly platform to complete positioning.
7. The method of gas pressure diffusion welding of a thin-walled microchannel heat exchanger core as recited in claim 4, wherein: the kraft paper between the sheets is taken out before spot welding in step S2.
8. The method for gas pressure diffusion welding of the thin-wall microchannel heat exchanger core as recited in claim 1, wherein: in step S2, the spot welding method is argon arc welding, and the welding spots are distributed as 1 to 2 welding spots per edge.
9. The method for gas pressure diffusion welding of the thin-wall microchannel heat exchanger core as recited in claim 1, wherein: in step S3, the heat exchanger core in step S2 is hermetically welded by: and (5) putting the whole heat exchanger core body in the step (S2) into an electron beam welding device, and welding by using an electron beam, wherein the electron beam is completed in a vacuum environment.
10. The method of gas pressure diffusion welding of a thin-walled microchannel heat exchanger core as recited in claim 9, wherein: in step S3, the width of the electron beam welded bead should not be greater than 5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111560814.7A CN114192961A (en) | 2021-12-20 | 2021-12-20 | Method for gas pressurization diffusion welding of thin-wall micro-channel heat exchanger core |
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| CN202111560814.7A CN114192961A (en) | 2021-12-20 | 2021-12-20 | Method for gas pressurization diffusion welding of thin-wall micro-channel heat exchanger core |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117564431A (en) * | 2024-01-17 | 2024-02-20 | 北京海德利森科技有限公司 | Welding method of diffusion welding capillary tube heat exchanger |
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2021
- 2021-12-20 CN CN202111560814.7A patent/CN114192961A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117564431A (en) * | 2024-01-17 | 2024-02-20 | 北京海德利森科技有限公司 | Welding method of diffusion welding capillary tube heat exchanger |
| CN117564431B (en) * | 2024-01-17 | 2024-04-12 | 北京海德利森科技有限公司 | Welding method of diffusion welding capillary tube heat exchanger |
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