CN115979027A - High-temperature titanium alloy micro-channel heat exchanger and welding process thereof - Google Patents
High-temperature titanium alloy micro-channel heat exchanger and welding process thereof Download PDFInfo
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- CN115979027A CN115979027A CN202211685523.5A CN202211685523A CN115979027A CN 115979027 A CN115979027 A CN 115979027A CN 202211685523 A CN202211685523 A CN 202211685523A CN 115979027 A CN115979027 A CN 115979027A
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Abstract
The invention provides a high-temperature titanium alloy micro-channel heat exchanger and a welding process thereof, and belongs to the technical field of titanium alloy micro-channel heat exchangers. The problems that the traditional diffusion welding can form micro cracks in a compression molding area and can generate distortion deformation in the vertical compression direction are solved. The heat exchanger plate set comprises two cover plates and a heat exchanger plate set, wherein the two cover plates are respectively arranged on the upper surface and the lower surface of the heat exchanger plate set, the heat exchanger plate set comprises a plurality of heat exchanger plate sheets a and a plurality of heat exchanger plate sheets b, and the heat exchanger plate sheets a and the heat exchanger plate sheets b are sequentially and alternately stacked. The welding method is mainly used for welding the high-temperature titanium alloy micro-channel heat exchanger.
Description
Technical Field
The invention belongs to the technical field of titanium alloy microchannel heat exchangers, and particularly relates to a high-temperature titanium alloy microchannel heat exchanger and a welding process thereof.
Background
With the development of the industries such as aerospace, ships and energy, the traditional heat exchanger can not meet the requirements of the fields on the working temperature, pressure, power-weight ratio and the like of the heat exchanger. Compared with the traditional radiator, the micro-channel radiator has the characteristics of compact structure, large heat exchange area per unit volume, high heat exchange efficiency and the like while meeting the requirements.
The titanium alloy micro-channel heat exchanger has many excellent characteristics such as high corrosion resistance, high specific gravity, high heat exchange efficiency and the like, is adopted in many important projects so far, and is widely applied to projects such as the petroleum industry, the nuclear industry and the like, the high-temperature titanium alloy micro-channel heat exchanger can be applied to a reactor through cooling media such as molten salt and the like to improve the energy conversion efficiency, and plays a key role in the effective transmission of heat energy as a heat exchanger between a nuclear island heat carrying system and a technological process heat carrying system.
Although the micro-channel heat exchanger can be manufactured by traditional diffusion welding, micro cracks are formed in a compression molding area, and distortion is generated in the vertical compression direction.
Disclosure of Invention
In view of the above, the present invention is directed to a high temperature titanium alloy micro channel heat exchanger and a welding process thereof, so as to solve the problems that the conventional diffusion welding will form micro cracks in the pressed forming region and will generate distortion in the vertical pressing direction.
In order to realize the purpose, the invention adopts the following technical scheme: the utility model provides a high temperature titanium alloy microchannel heat exchanger, it includes two apron and heat exchanger plate group, two apron set up respectively at the upper surface and the lower surface of heat exchanger plate group, heat exchanger plate group includes a plurality of heat exchanger plate a and a plurality of heat exchanger plate b, heat exchanger plate a and heat exchanger plate b superpose in proper order in turn.
Furthermore, the cover plate and the heat exchange plate group are made of titanium alloy.
The invention also provides a welding process of the high-temperature titanium alloy micro-channel heat exchanger, which comprises the following steps:
step 1: after ultrasonic degreasing and cleaning are carried out on the heat exchange plate a and the heat exchange plate b, acid washing is carried out on the heat exchange plate a and the heat exchange plate b by using acid washing liquid;
step 2: combining the pickled heat exchange plate sheets a and the pickled heat exchange plate sheets b into heat exchange plate groups, and covering plates on the upper and lower surfaces of the combined heat exchange plate groups to finish the assembly of the high-temperature titanium alloy micro-channel heat exchanger;
and step 3: carrying out closed sheathing treatment on the assembled high-temperature titanium alloy micro-channel heat exchanger;
and 4, step 4: placing the high-temperature titanium alloy micro-channel heat exchanger subjected to the closed wrapping treatment into a hot isostatic pressing furnace for a diffusion welding process, and taking the high-temperature titanium alloy micro-channel heat exchanger out of the hot isostatic pressing furnace after the diffusion welding is finished;
and 5: and removing the closed sheath of the high-temperature titanium alloy micro-channel heat exchanger, processing the exposed runner port, and milling and removing the solid part outside the runner of the heat exchange plate group.
Furthermore, the proportion of the pickling solution in the step 1 is HNO 3 HF =5, proper amount of water, and pickling time of 3-8min.
Furthermore, in the step 3, the sealing sheathing treatment of the high-temperature titanium alloy microchannel heat exchanger is to coat four sheathing plates around the heat exchange plate group of the high-temperature titanium alloy microchannel heat exchanger respectively, and weld the joint between two adjacent sheathing plates.
Furthermore, the sleeve plate is made of titanium alloy.
Furthermore, the diffusion welding process in the step 4 is to uniformly increase the pressure of the hot isostatic pressing furnace to 40-50Mpa within three hours, simultaneously increase the temperature to 920-970 ℃ at a uniform speed, keep the temperature and pressure for 4-6 hours, cool the furnace to below 100 ℃ after the heat and pressure are kept, open the hot isostatic pressing furnace to cool to about room temperature, and take out the high-temperature titanium alloy micro-channel heat exchanger.
Furthermore, the step 5 of removing the closed sheath of the high-temperature titanium alloy microchannel heat exchanger is to disassemble four sleeve plates from the high-temperature titanium alloy microchannel heat exchanger.
Compared with the prior art, the invention has the beneficial effects that:
1. the safe and reliable welding process method of the high-temperature titanium alloy micro-channel heat exchanger is convenient for improving the heat exchange efficiency of the reinforced heat exchanger, improving the power-weight ratio, reducing the cost and the using area, simultaneously enabling the integral structure of the heat exchanger to be more stable, and greatly improving the phenomena that the traditional diffusion welded heat exchanger has poor high-temperature and high-pressure resistance and is easy to leak between heat exchange plates;
2. the high-temperature titanium alloy microchannel heat exchanger is welded by using the hot isostatic pressing diffusion welding process, so that not only can densification treatment be carried out on the high-temperature titanium alloy to obviously repair fine defects in the metal, but also all directions of the welded high-temperature titanium alloy microchannel heat exchanger can be uniformly pressed under the combined action of high pressure and high temperature, the distortion and deformation of the welded high-temperature titanium alloy microchannel heat exchanger are reduced, the diffusion connection of the heat exchanger is realized through a metal diffusion mechanism, meanwhile, the internal space of hot isostatic pressing equipment is large, a plurality of heat exchangers with proper sizes can be welded simultaneously through reasonable placement, the production efficiency is improved in multiples, and the cost of energy and the like is saved;
3. the welding process has the advantages of high connection strength, complete microstructure, small torsion resistance and the like, and can effectively improve the production efficiency and the product quality.
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 the overall structure of a high temperature titanium alloy micro-channel heat exchanger according to the present invention;
FIG. 2 is a schematic view of the overall structural assembly of a high temperature titanium alloy micro-channel heat exchanger according to the present invention;
FIG. 3 is a schematic view of a structural combination of a heat exchange plate set of a high temperature titanium alloy micro-channel heat exchanger according to the present invention;
FIG. 4 is a schematic structural diagram of a heat exchange plate a of the high-temperature titanium alloy microchannel heat exchanger according to the invention;
FIG. 5 is a schematic structural diagram of a heat exchange plate b of the high-temperature titanium alloy micro-channel heat exchanger according to the invention;
FIG. 6 is a schematic structural diagram of a closed jacket treatment of a high-temperature titanium alloy microchannel heat exchanger according to the present invention.
1-cover plate, 2-heat exchange plate a, 3-heat exchange plate b, 4-sleeve plate.
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.
Referring to fig. 1 to 6 to illustrate the embodiment, the high-temperature titanium alloy microchannel heat exchanger includes two cover plates 1 and a heat exchange plate group, where the two cover plates 1 are respectively disposed on the upper surface and the lower surface of the heat exchange plate group, the heat exchange plate group includes a plurality of heat exchange plate sheets a2 and a plurality of heat exchange plate sheets b3, and the heat exchange plate sheets a2 and the heat exchange plate sheets b3 are sequentially and alternately stacked.
In this embodiment, the cover plate 1 and the heat exchanger plate set are made of titanium alloy.
The embodiment also provides a welding process of the high-temperature titanium alloy micro-channel heat exchanger, which comprises the following steps of:
step 1: after ultrasonic degreasing and cleaning are carried out on the heat exchange plate a2 and the heat exchange plate b3, pickling is carried out by using a pickling solution to remove an oxide layer, the surfaces of the heat exchange plate a2 and the heat exchange plate b3 after pickling are smooth, have metallic luster and are silvery white or grey white, and marks such as pits, spots, fingerprints and the like cannot be regarded as qualified;
step 2: combining the pickled heat exchange plate a2 and the pickled heat exchange plate b3 into a heat exchange plate group, and covering plates 1 on the upper surface and the lower surface of the combined heat exchange plate group to finish the assembly of the high-temperature titanium alloy micro-channel heat exchanger;
and step 3: carrying out closed sheathing treatment on the assembled high-temperature titanium alloy micro-channel heat exchanger;
and 4, step 4: placing the high-temperature titanium alloy micro-channel heat exchanger subjected to the closed wrapping treatment into a hot isostatic pressing furnace for a diffusion welding process, and taking the high-temperature titanium alloy micro-channel heat exchanger out of the hot isostatic pressing furnace after the diffusion welding is finished;
and 5: removing the closed sheath of the high-temperature titanium alloy micro-channel heat exchanger, processing the exposed runner port into a required shape, simultaneously carrying out moderate milling and removing treatment on the solid part outside the runner of the heat exchange plate group to achieve the purpose of reducing weight, namely, the minimum distance between the outer surface and the runner after the processing is finished is not less than 30mm, and subsequently carrying out processes such as assembly welding of an external end enclosure flange part and the high-temperature titanium alloy micro-channel heat exchanger and the like.
In the embodiment, the proportion of the pickling solution in the step 1 is HNO 3 HF =5, proper amount of water, and pickling time of 3-8min.
In the embodiment, the closed sheathing treatment of the high-temperature titanium alloy microchannel heat exchanger in step 3 is to wrap four sheathing plates 4 around a heat exchange plate group of the high-temperature titanium alloy microchannel heat exchanger respectively, and weld the joint between two adjacent sheathing plates 4, so that the high-temperature titanium alloy microchannel heat exchanger assembly can be subjected to closed sheathing treatment at room temperature and normal pressure because the internal flow passage space of the high-temperature titanium alloy microchannel heat exchanger assembly is small and the solid-solid hot isostatic pressure is adopted.
In this embodiment, the sleeve plate 4 is made of titanium alloy of the same grade.
In the step 4 of the embodiment, the diffusion welding process includes raising the pressure of the hot isostatic pressing furnace to 40-50Mpa at a constant speed within three hours, raising the temperature to 920-970 ℃ at a constant speed, maintaining the temperature and pressure for 4-6 hours, cooling the furnace to below 100 ℃ after the temperature and pressure are maintained, opening the hot isostatic pressing furnace to cool to about room temperature, and taking out the high-temperature titanium alloy microchannel heat exchanger.
In the embodiment, the step 5 of removing the closed sheath of the high-temperature titanium alloy microchannel heat exchanger is to disassemble the four sleeve plates 4 from the high-temperature titanium alloy microchannel heat exchanger.
The hot isostatic pressing diffusion welding process is applied to welding the high-temperature titanium alloy micro-channel heat exchanger, fine defects in metal can be obviously repaired through densification treatment of the high-temperature titanium alloy, under the combined action of high pressure and high temperature, the welded high-temperature titanium alloy micro-channel heat exchanger can be stressed in all directions in a balanced mode, distortion is reduced, diffusion connection of the heat exchanger is achieved through a metal diffusion mechanism, meanwhile, the internal space of hot isostatic pressing equipment is large, the heat exchanger can be welded to a plurality of heat exchangers with proper sizes simultaneously through reasonable placement, production efficiency is improved in multiples, and cost such as energy is saved.
The welding process of the embodiment has the advantages of high connection strength, complete microstructure, small torsion resistance and the like, and can effectively improve the production efficiency and the product quality.
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 (8)
1. A high temperature titanium alloy microchannel heat exchanger which is characterized in that: the heat exchanger plate set comprises two cover plates (1) and a heat exchanger plate set, wherein the two cover plates (1) are respectively arranged on the upper surface and the lower surface of the heat exchanger plate set, the heat exchanger plate set comprises a plurality of heat exchanger plate sheets a (2) and a plurality of heat exchanger plate sheets b (3), and the heat exchanger plate sheets a (2) and the heat exchanger plate sheets b (3) are sequentially and alternately stacked.
2. A high temperature titanium alloy microchannel heat exchanger as recited in claim 1 wherein: the cover plate (1) and the heat exchange plate group are both made of titanium alloy.
3. A welding process for a high temperature titanium alloy microchannel heat exchanger as claimed in any one of claims 1 to 2, wherein: it comprises the following steps:
step 1: after ultrasonic degreasing and cleaning are carried out on the heat exchange plate a (2) and the heat exchange plate b (3), pickling is carried out by using a pickling solution;
step 2: combining the pickled heat exchange plate a (2) and the pickled heat exchange plate b (3) into a heat exchange plate group, and covering plates (1) on the upper surface and the lower surface of the combined heat exchange plate group to finish the assembly of the high-temperature titanium alloy micro-channel heat exchanger;
and step 3: carrying out closed sheathing treatment on the assembled high-temperature titanium alloy micro-channel heat exchanger;
and 4, step 4: placing the high-temperature titanium alloy micro-channel heat exchanger subjected to the closed wrapping treatment into a hot isostatic pressing furnace for a diffusion welding process, and taking the high-temperature titanium alloy micro-channel heat exchanger out of the hot isostatic pressing furnace after the diffusion welding is finished;
and 5: and removing the closed sheath of the high-temperature titanium alloy micro-channel heat exchanger, processing the exposed runner port, and milling and removing the solid part outside the runner of the heat exchange plate group.
4. The welding process of the high-temperature titanium alloy micro-channel heat exchanger according to claim 3, wherein: the proportion of the pickling solution in the step 1 is HNO 3 HF =5, proper amount of water, and pickling time of 3-8min.
5. The welding process of the high-temperature titanium alloy micro-channel heat exchanger according to claim 3, wherein: and 3, the closed sheathing treatment of the high-temperature titanium alloy micro-channel heat exchanger in the step 3 is to coat four sheathing plates (4) around a heat exchange plate group of the high-temperature titanium alloy micro-channel heat exchanger respectively and weld the joint between two adjacent sheathing plates (4).
6. The welding process of the high-temperature titanium alloy micro-channel heat exchanger according to claim 5, wherein: the sleeve plate (4) is made of titanium alloy.
7. The welding process of the high-temperature titanium alloy micro-channel heat exchanger according to claim 3, characterized in that: and 4, in the diffusion welding process in the step 4, the hot isostatic pressing furnace is uniformly pressurized to 40-50Mpa within three hours, simultaneously the temperature is uniformly raised to 920-970 ℃, the heat preservation and pressure preservation are carried out for 4-6 hours, the furnace is cooled to be below 100 ℃ after the heat preservation and pressure preservation are finished, the hot isostatic pressing furnace is opened and cooled to about room temperature, and the high-temperature titanium alloy microchannel heat exchanger is taken out.
8. The welding process of the high-temperature titanium alloy micro-channel heat exchanger according to claim 3, wherein: and in the step 5, the sealed sheath removing treatment of the high-temperature titanium alloy micro-channel heat exchanger is to disassemble the four sleeve plates (4) from the high-temperature titanium alloy micro-channel heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211685523.5A CN115979027A (en) | 2022-12-27 | 2022-12-27 | High-temperature titanium alloy micro-channel heat exchanger and welding process thereof |
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| CN202211685523.5A CN115979027A (en) | 2022-12-27 | 2022-12-27 | High-temperature titanium alloy micro-channel heat exchanger and welding process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117268146A (en) * | 2023-11-15 | 2023-12-22 | 中国核动力研究设计院 | Diffusion welding heat exchanger and design method thereof |
| CN117680802A (en) * | 2024-01-11 | 2024-03-12 | 贵州永红航空机械有限责任公司 | Titanium alloy microchannel heat exchanger manufacturing method |
| CN117680802B (en) * | 2024-01-11 | 2024-05-10 | 贵州永红航空机械有限责任公司 | Titanium alloy microchannel heat exchanger manufacturing method |
-
2022
- 2022-12-27 CN CN202211685523.5A patent/CN115979027A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117268146A (en) * | 2023-11-15 | 2023-12-22 | 中国核动力研究设计院 | Diffusion welding heat exchanger and design method thereof |
| CN117268146B (en) * | 2023-11-15 | 2024-01-26 | 中国核动力研究设计院 | Diffusion welding heat exchanger and design method thereof |
| CN117680802A (en) * | 2024-01-11 | 2024-03-12 | 贵州永红航空机械有限责任公司 | Titanium alloy microchannel heat exchanger manufacturing method |
| CN117680802B (en) * | 2024-01-11 | 2024-05-10 | 贵州永红航空机械有限责任公司 | Titanium alloy microchannel heat exchanger manufacturing method |
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