CN103600149A - Brazing method for thin-wall heat conducting pipes - Google Patents
Brazing method for thin-wall heat conducting pipes Download PDFInfo
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- CN103600149A CN103600149A CN201310578260.2A CN201310578260A CN103600149A CN 103600149 A CN103600149 A CN 103600149A CN 201310578260 A CN201310578260 A CN 201310578260A CN 103600149 A CN103600149 A CN 103600149A
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- brazing
- conduit
- filler material
- solder
- brazing filler
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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
- 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
- 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
- B23K1/206—Cleaning
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3612—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with organic compounds as principal constituents
- B23K35/3613—Polymers, e.g. resins
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
The invention discloses a brazing method for thin-wall heat conducting pipes and belongs to the technical field of welding. The brazing method includes the steps of (1) preparing before brazing, (2) preparing an adhesive solder, (3) presetting the solder, (4) punching the solder, (5) assembling a conduit onto an upper end cap and a lower end cap of the preset adhesive solder by the aid of a brazing clamp, (6) curing binder, namely placing the parts together with the clamp into a drying box and heating to the temperature of 180+/-10 DEG C, holding the temperature for 60-80 minutes and then cooling to the room temperature, and (7) performing vacuum brazing by the process of placing the parts together with the clamp on a bracket in a vacuum furnace at the brazing temperature of 1170+/-10 DEG C, holding the temperature for 5-8 minutes under the vacuum pressure lower than 3*10-2Pa. By the brazing method, quantity of the solder at different joints can be controlled to be consistent, corrosion of the thin-wall heat conducting pipes can be avoided effectively, and high compactness of the brazed joints can be guaranteed; further, heat exchangers can be brazed in a qualified manner at one time so that manufacturing cost can be reduced obviously and productivity can be increased greatly.
Description
Technical field
The present invention relates to welding technology field, be specifically related to a kind of method for welding of thin-wallconduit heat exchanger.
Background technology
Thin-wallconduit heat exchanger of the present invention is comprised of upper end cover, bottom end cover and 450 conduits (diameter phi 1.5mm, wall thickness 0.2mm), and each part material is stainless steel.Wherein upper end cover edge adopts argon arc welding to be connected with straight mouthful of requirement of bottom end cover, forms inner chamber, and guarantees that upper end cover keeps coaxial with the corresponding hole on bottom end cover; The two ends of 450 conduits are inserted respectively in the hole on upper end cover and bottom end cover and are adopted brazing.The difficult point of described heat exchanger is the brazing of conduit and upper end cover and bottom end cover, is mainly manifested in: soldered fitting is many and sealing requirements is high, is not easy once to have welded and guaranteed the compactness of joint; Conduit is intensive, and the interval between tube wall is 1.0mm only, and preseting solder difficulty is larger; Catheter wall is thin, easily produces soldering corrosion, and the control of solder amount is had higher requirements.Original method for welding is to adopt twice soldering, that is: conduit is joined at the enterprising luggage of fixture with upper end cover and bottom end cover during a soldering, B-Ni71CrSi powder brazing alloy is spread in joint to be welded at conduit and upper end cover after assembling, then part is together entered to stove with fixture and carries out vacuum brazing; While carrying out secondary soldering after a soldering is qualified, fitting turnover made to bottom end cover upward and be placed on fixture, in the joint to be welded of conduit and bottom end cover, spreading B-Ni82CrSiB powder brazing alloy subsequently, then part together being entered to stove with fixture and carry out secondary vacuum soldering.Although use said method soldering to go out satisfactory heat exchanger, the problem existing is also more obvious.The one,, spread powder brazing alloy by hand, can not control solder even thickness consistent, during soldering, the too much joint conduit of solder easily produces corrosion, and easily the exert an influence defect of compactness of the joint of solder deficiency, the repair welding that often needs to change the repair welding of conduit and repair defect; The 2nd,, conduit needs twice soldering to complete, and needs the solder of different fusion temperature scopes, complex process, part adopts twice vacuum brazing cost higher simultaneously, and repair welding in addition, more strengthened manufacturing cost, and production efficiency is also lower.For this reason, be necessary the method for welding of described heat exchanger to be improved.
summary of the invention:
The object of this invention is to provide a kind of workable, technique effect is better, cost is low, efficiency is high thin-wallconduit heat exchanger method for welding.
A method for welding for thin-wallconduit heat exchanger, carries out according to the following steps:
(1) before weldering, prepare: the ratio in 10%, the hole that sampling observation thin-wallconduit heat exchanger upper and lower end covers and the fit clearance between conduit, fit clearance should be controlled within the scope of 0.03～0.05mm;
The upper and lower end cap and the whole conduit that by argon arc welding, are connected into integral body are carried out to Ultrasonic Cleaning, after cleaning, with compressed air, part is dried up, the piece surface after requirement is cleaned is without grease and other impurity;
(2) prepare sticky brazing filler material: the B-Ni71CrSi powder brazing alloy that is 90～94% by percentage by weight is that 6～10% adhesive specials mix with percentage by weight, the bonding shape of furnishing, then be pressed into the adhesive tape that thickness is 0.5～0.8mm, and according to area size's cutting adhesive tape of upper and lower end cap conduit to be brazed;
(3) preseting solder: be that dimethylbenzene that 85～90% canada balsams are 10～15% with percentage by weight mixes mutually and is modulated into uniform solution by percentage by weight, in the region surface of upper and lower end cap conduit to be brazed, brush canada balsam dimethylbenzene mixed solution, then the sticky brazing filler material preparing is pasted to this region surface.
(4) solder cut hole: with fixture, the sticky brazing filler material cutting that covers ending cover hole is removed, require to keep residue sticky brazing filler material intact;
(5) ducts: on brazing jig, conduit and the upper and lower end cap of preset sticky brazing filler material are assembled, controlled and the position of A/C by fixture, must not make sticky brazing filler material perk during ducts, and guarantee that conduit and sticky brazing filler material fit;
(6) cured binders: part is together put into drying baker heating with fixture, when temperature rises to 180 ± 10 ℃, be cooled to room temperature after being incubated 60～80min;
(7) vacuum brazing: part is together placed on the bracket in vacuum drying oven with fixture, carries out vacuum brazing, brazing temperature: (1170 ± 10) ℃, temperature retention time: (5～8) minute, vacuum pressure: be less than 3 * 10
-2pa.
Described adhesive special chemical composition is by mass percentage: polymethyl methacrylate 5～15%, 1,2 dichloroethanes 50～70%, dibutyl phthalate 20～40%.
The method can be controlled the solder amount uniformity of each joint, thereby effectively prevents thin-wallconduit corrosion, guarantees that soldered fitting has higher compactness.The method can be qualified by a soldering of described heat exchanger simultaneously, significantly reduces manufacturing cost, increases substantially productivity ratio.
Accompanying drawing explanation
Fig. 1 is the preset sticky brazing filler material schematic diagram of thin-wallconduit heat exchanger of the present invention; Wherein 1 is upper end cover, and 2 is bottom end cover, and 3 is preset sticky brazing filler material, and 4 is region to be welded;
Fig. 2 is thin-wallconduit heat exchanger assembling of the present invention, welding schematic diagram, and wherein 1 is conduit, and 2 is upper end cover, and 3 is sticky brazing filler material, and 4 is bottom end cover, and 5 is brazing jig.
The specific embodiment
Below in conjunction with drawings and embodiments, the invention will be further described.The chemical composition of adhesive special described in following examples is by mass percentage: polymethyl methacrylate 5～15%, 1,2 dichloroethanes 50～70%, dibutyl phthalate 20～40%.
Before weldering, prepare: the ratio in 10%, the hole that sampling observation thin-wallconduit heat exchanger upper and lower end covers and the fit clearance between conduit, fit clearance should be controlled within the scope of 0.03～0.05mm.
The upper and lower end cap and the whole conduit that by argon arc welding, are connected into integral body are carried out to Ultrasonic Cleaning.After cleaning, with compressed air, part is dried up.Piece surface after requirement is cleaned is without grease and other impurity.
Prepare sticky brazing filler material: the B-Ni71CrSi powder brazing alloy that is 92% by percentage by weight is that 8% adhesive special mixes with percentage by weight, the bonding shape of furnishing, then be pressed into the adhesive tape that thickness is 0.5mm, and according to area size's cutting adhesive tape of upper end cover and bottom end cover conduit to be brazed.
Preseting solder: be that dimethylbenzene that 88% canada balsam is 12% with percentage by weight mixes mutually and modulates uniform solution by percentage by weight, on surface, the region of upper and lower end cap conduit to be brazed (as Fig. 1), brush canada balsam dimethylbenzene mixed solution, then the sticky brazing filler material preparing is pasted to this region surface.
Solder cut hole: the sticky brazing filler material cutting that covers ending cover hole is removed with fixture.Require to keep residue sticky brazing filler material intact.
Ducts: on brazing jig, conduit and the upper and lower end cap of preset sticky brazing filler material are assembled, controlled and the position of A/C by fixture.During ducts, sticky brazing filler material perk be must not make, and conduit and sticky brazing filler material laminating guaranteed.
Cured binders: part is together put into drying baker heating with fixture, when temperature rises to 180 ℃, be cooled to room temperature after being incubated 70 minutes.
Vacuum brazing: part is together placed on the bracket in vacuum drying oven with fixture, carries out vacuum brazing.Brazing temperature: 1170 ℃, temperature retention time: 5 minutes, vacuum pressure: be less than 3 * 10
-2pa.
Conduit after soldering is carried out to following quality inspection:
1) outward appearance sight check: assay shows, solder complete wetting matrix is also sprawled stream and is opened; Solder joint is smooth continuously, the defects such as nothing is not burn-on, pore; Thin-wallconduit is without corrosion phenomenon.
2) water-pressure sealed check: weldment is placed on exerciser and carries out water-pressure sealed inspection, and water pressure is 0.5MPa.Assay shows, all solder joint ne-leakage phenomenons.
Before weldering, prepare: the ratio in 10%, the hole that sampling observation upper and lower end covers and the fit clearance between conduit, fit clearance should be controlled within the scope of (0.03～0.05) mm.
The upper and lower end cap and the whole conduit that by argon arc welding, are connected into integral body are carried out to Ultrasonic Cleaning.After cleaning, with compressed air, part is dried up.Piece surface after requirement is cleaned is without grease and other impurity.
Prepare sticky brazing filler material: the B-Ni71CrSi powder brazing alloy that is 92% by percentage by weight is that 8% adhesive special mixes with percentage by weight, the bonding shape of furnishing, then be pressed into the adhesive tape that thickness is 0.8mm, and according to area size's cutting adhesive tape of upper end cover and bottom end cover conduit to be brazed.
Preseting solder: be that dimethylbenzene that 88% canada balsam is 12% with percentage by weight mixes mutually and modulates uniform solution by percentage by weight, in the region surface of upper and lower end cap conduit to be brazed, brush canada balsam dimethylbenzene mixed solution, then the sticky brazing filler material preparing is pasted to this region surface.
Solder cut hole: the sticky brazing filler material cutting that covers ending cover hole is removed with fixture.Require to keep residue sticky brazing filler material intact.
Ducts: on brazing jig, conduit and the upper and lower end cap of preset sticky brazing filler material are assembled, controlled and the position of A/C by fixture.During ducts, sticky brazing filler material perk be must not make, and conduit and sticky brazing filler material laminating guaranteed.
Cured binders: part is together put into drying baker heating with fixture, when temperature rises to 180 ℃, be cooled to room temperature after being incubated 70 minutes.
Vacuum brazing: part is together placed on the bracket in vacuum drying oven with fixture, carries out vacuum brazing.Brazing temperature: 1180 ℃, temperature retention time: 8 minutes, vacuum pressure: be less than 3 * 10
-2pa.
Conduit after soldering is carried out to following quality inspection:
1) outward appearance sight check: assay shows, solder complete wetting matrix is also sprawled stream and is opened; Solder joint is smooth continuously, the defects such as nothing is not burn-on, pore; Thin-wallconduit is without corrosion phenomenon.
2) water-pressure sealed check: weldment is placed on exerciser and carries out water-pressure sealed inspection, and water pressure is 0.5MPa.Assay shows, all solder joint ne-leakage phenomenons.
embodiment 3
Before weldering, prepare: the ratio in 10%, the hole that sampling observation thin-wallconduit heat exchanger upper and lower end covers and the fit clearance between conduit, fit clearance should be controlled within the scope of 0.03～0.05mm;
The upper and lower end cap and the whole conduit that by argon arc welding, are connected into integral body are carried out to Ultrasonic Cleaning, after cleaning, with compressed air, part is dried up, the piece surface after requirement is cleaned is without grease and other impurity;
Prepare sticky brazing filler material: the B-Ni71CrSi powder brazing alloy that is 90% by percentage by weight is that 10% adhesive special mixes with percentage by weight, the bonding shape of furnishing, then be pressed into the adhesive tape that thickness is 0.8mm, and according to area size's cutting adhesive tape of upper and lower end cap conduit to be brazed;
Preseting solder: be that dimethylbenzene that 85% canada balsam is 15% with percentage by weight mixes mutually and is modulated into uniform solution by percentage by weight, in the region surface of upper and lower end cap conduit to be brazed, brush canada balsam dimethylbenzene mixed solution, then the sticky brazing filler material preparing is pasted to this region surface.
Solder cut hole: with fixture, the sticky brazing filler material cutting that covers ending cover hole is removed, require to keep residue sticky brazing filler material intact;
Ducts: on brazing jig, conduit and the upper and lower end cap of preset sticky brazing filler material are assembled, controlled and the position of A/C by fixture, must not make sticky brazing filler material perk during ducts, and guarantee that conduit and sticky brazing filler material fit;
Cured binders: part is together put into drying baker heating with fixture, when temperature rises to 180 ± 10 ℃, be cooled to room temperature after insulation 60min;
Vacuum brazing: part is together placed on the bracket in vacuum drying oven with fixture, carries out vacuum brazing, brazing temperature: (1170 ± 10) ℃, temperature retention time: 8 minutes, vacuum pressure: be less than 3 * 10
-2pa.
Conduit after soldering is carried out to following quality inspection:
1) outward appearance sight check: assay shows, solder complete wetting matrix is also sprawled stream and is opened; Solder joint is smooth continuously, the defects such as nothing is not burn-on, pore; Thin-wallconduit is without corrosion phenomenon.
2) water-pressure sealed check: weldment is placed on exerciser and carries out water-pressure sealed inspection, and water pressure is 0.5MPa.Assay shows, all solder joint ne-leakage phenomenons.
Before weldering, prepare: the ratio in 10%, the hole that sampling observation thin-wallconduit heat exchanger upper and lower end covers and the fit clearance between conduit, fit clearance should be controlled within the scope of 0.03～0.05mm;
The upper and lower end cap and the whole conduit that by argon arc welding, are connected into integral body are carried out to Ultrasonic Cleaning, after cleaning, with compressed air, part is dried up, the piece surface after requirement is cleaned is without grease and other impurity;
Prepare sticky brazing filler material: the B-Ni71CrSi powder brazing alloy that is 94% by percentage by weight is that 6% adhesive special mixes with percentage by weight, the bonding shape of furnishing, then be pressed into the adhesive tape that thickness is 0.6mm, and according to area size's cutting adhesive tape of upper and lower end cap conduit to be brazed;
Preseting solder: be that dimethylbenzene that 90% canada balsam is 10% with percentage by weight mixes mutually and is modulated into uniform solution by percentage by weight, in the region surface of upper and lower end cap conduit to be brazed, brush canada balsam dimethylbenzene mixed solution, then the sticky brazing filler material preparing is pasted to this region surface.
Solder cut hole: with fixture, the sticky brazing filler material cutting that covers ending cover hole is removed, require to keep residue sticky brazing filler material intact;
Ducts: on brazing jig, conduit and the upper and lower end cap of preset sticky brazing filler material are assembled, controlled and the position of A/C by fixture, must not make sticky brazing filler material perk during ducts, and guarantee that conduit and sticky brazing filler material fit;
Cured binders: part is together put into drying baker heating with fixture, when temperature rises to 180 ± 10 ℃, be cooled to room temperature after insulation 80min;
Vacuum brazing: part is together placed on the bracket in vacuum drying oven with fixture, carries out vacuum brazing, brazing temperature: (1170 ± 10) ℃, temperature retention time: 7 minutes, vacuum pressure: be less than 3 * 10
-2pa.
Conduit after soldering is carried out to following quality inspection:
1) outward appearance sight check: assay shows, solder complete wetting matrix is also sprawled stream and is opened; Solder joint is smooth continuously, the defects such as nothing is not burn-on, pore; Thin-wallconduit is without corrosion phenomenon.
2) water-pressure sealed check: weldment is placed on exerciser and carries out water-pressure sealed inspection, and water pressure is 0.5MPa.Assay shows, all solder joint ne-leakage phenomenons.
Claims (2)
1. a method for welding for thin-wallconduit heat exchanger, is characterized in that carrying out according to the following steps:
(1) before weldering, prepare: the ratio in 10%, the hole that sampling observation thin-wallconduit heat exchanger upper and lower end covers and the fit clearance between conduit, fit clearance should be controlled within the scope of 0.03～0.05mm;
The upper and lower end cap and the whole conduit that by argon arc welding, are connected into integral body are carried out to Ultrasonic Cleaning, after cleaning, with compressed air, part is dried up, the piece surface after requirement is cleaned is without grease and other impurity;
(2) prepare sticky brazing filler material: the B-Ni71CrSi powder brazing alloy that is 90～94% by percentage by weight is that 6～10% adhesive specials mix with percentage by weight, the bonding shape of furnishing, then be pressed into the adhesive tape that thickness is 0.5～0.8mm, and according to area size's cutting adhesive tape of upper and lower end cap conduit to be brazed;
(3) preseting solder: be that dimethylbenzene that 85～90% canada balsams are 10～15% with percentage by weight mixes mutually and is modulated into uniform solution by percentage by weight, in the region surface of upper and lower end cap conduit to be brazed, brush canada balsam dimethylbenzene mixed solution, then the sticky brazing filler material preparing is pasted to this region surface;
(4) solder cut hole: with fixture, the sticky brazing filler material cutting that covers ending cover hole is removed, require to keep residue sticky brazing filler material intact;
(5) ducts: on brazing jig, conduit and the upper and lower end cap of preset sticky brazing filler material are assembled, controlled and the position of A/C by fixture, must not make sticky brazing filler material perk during ducts, and guarantee that conduit and sticky brazing filler material fit;
(6) cured binders: part is together put into drying baker heating with fixture, when temperature rises to 180 ± 10 ℃, be cooled to room temperature after being incubated 60～80min;
(7) vacuum brazing: part is together placed on the bracket in vacuum drying oven with fixture, carries out vacuum brazing, brazing temperature: 1170 ± 10 ℃, temperature retention time: 5～8min, vacuum pressure: be less than 3 * 10
-2pa.
2. a method for welding for thin-wallconduit heat exchanger, is characterized in that described adhesive special chemical composition is by mass percentage: polymethyl methacrylate 5～15%, 1,2 dichloroethanes 50～70%, dibutyl phthalate 20～40%.
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| CN201310578260.2A CN103600149B (en) | 2013-11-15 | 2013-11-15 | A kind of method for welding of thin-wallconduit heat exchanger |
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Cited By (8)
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| CN104625468A (en) * | 2015-01-27 | 2015-05-20 | 爱恒能源科技（上海）有限公司 | Metal powder for aluminum alloy structural component connection and connection method thereof |
| CN106363266A (en) * | 2016-11-22 | 2017-02-01 | 中国航空工业集团公司北京航空材料研究院 | Method for braze-welding core body of tube type radiator by adopting strip-shaped brazing filler metal |
| CN107322251A (en) * | 2017-07-17 | 2017-11-07 | 中国电子科技集团公司第五十四研究所 | A kind of production technology of aluminium alloy microchannel heat sink |
| CN110014247A (en) * | 2018-11-16 | 2019-07-16 | 昆明贵金属研究所 | A kind of ABS type sticky brazing filler material and preparation method thereof |
| CN110560826A (en) * | 2019-08-02 | 2019-12-13 | 广州汉源新材料股份有限公司 | welded piece with soft solder layer pre-coated on surface and preparation method thereof |
| CN110899884A (en) * | 2019-12-06 | 2020-03-24 | 上海劲为精密机械有限公司 | Novel brazing process for machining high-power laser seat structure |
| CN111069725A (en) * | 2019-12-25 | 2020-04-28 | 航天海鹰(哈尔滨)钛业有限公司 | Method for manufacturing dense tube heat exchanger |
| CN113414558A (en) * | 2021-08-23 | 2021-09-21 | 西安远航真空钎焊技术有限公司 | Manufacturing method of coil heat exchanger core |
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| CN101391329A (en) * | 2008-11-05 | 2009-03-25 | 南京工业大学 | Vacuum brazing process for stainless steel plate fin structure |
| CN102489814A (en) * | 2011-12-22 | 2012-06-13 | 浙江大学 | Lamination-based vacuum brazing method for core part of plate-fin type aluminum heat exchanger |
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