CN1067199A - Method for brazing aluminum heat exchanger in air - Google Patents
Method for brazing aluminum heat exchanger in air Download PDFInfo
- Publication number
- CN1067199A CN1067199A CN 92102622 CN92102622A CN1067199A CN 1067199 A CN1067199 A CN 1067199A CN 92102622 CN92102622 CN 92102622 CN 92102622 A CN92102622 A CN 92102622A CN 1067199 A CN1067199 A CN 1067199A
- Authority
- CN
- China
- Prior art keywords
- aluminum
- aluminium
- heat exchanger
- alloy
- copper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005219 brazing Methods 0.000 title abstract description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 15
- 239000010949 copper Substances 0.000 claims abstract description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 13
- 239000007864 aqueous solution Substances 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 239000004411 aluminium Substances 0.000 claims description 26
- 239000003513 alkali Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000005554 pickling Methods 0.000 claims description 7
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 7
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000005476 soldering Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 5
- 229910000679 solder Inorganic materials 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 235000019628 coolness Nutrition 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 6
- 230000004907 flux Effects 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 abstract 2
- 230000007547 defect Effects 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The present invention is a method of brazing aluminum and aluminum alloy heat exchangers in air. And removing oil stain, dirt and oxide film of the workpiece to be welded by using a sodium hydroxide aqueous solution and a zinc nitrate aqueous solution. The welding flux is selected according to different materials, can weld thin and ultrathin aluminum pieces, can also weld the welding seam of the combination of aluminum, copper and iron, and is particularly suitable for brazing aluminum radiators of various automobiles in the atmosphere without using a furnace and protective gas. The aluminum heat exchanger can be produced by adding simple equipment to the equipment for producing the copper heat exchanger. The welding seam and the matrix are fused into a whole, the welding seam is bright, clean and attractive, and the tensile strength of the welding seam reaches 7-10 kg/mm2And the metallographic analysis welding line has no defects of impurities, pores, looseness and the like.
Description
The present invention is the method for brazed aluminum and Al-alloy heat exchanger in air.
The radiator that China overwhelming majority heat exchanger, particularly automobile are used is made with copper and copper alloy, and radiator is made with brazed copper by North America and Japan.Since copper than great, cost is high, and copper is again short material, this is from now on a developing direction to make radiator with aluminium and aluminium alloy Alloy instead of Copper.Aluminium radiator adopts mechanical assembled at the beginning, but inefficiency can not adapt to bad working environment, produces aluminium now and aluminium alloy heat radiator welds with vacuum drying oven, program complexity, apparatus expensive, long, big energy-consuming of production cycle have influenced the development of aluminum heat exchanger.Gases such as also useful now hydrogen, nitrogen are made protection gas and carry out soldering in stoves; this method needs stove and protective gas; also need to remove the remaining solder flux on the weld seam after the soldering, and also very difficult removal that has, because above various reasons has influenced the development of aluminum heat exchanger.
The objective of the invention is to invent a kind of without vacuum drying oven, also need not common stove and gas shield can carry out aluminium in atmosphere and aluminium alloy heat radiator is a method for welding, also can welding of aluminum and the weld seam of the heat exchanger that combines of copper, aluminium and iron.
The objective of the invention is to realize by following method.Materials such as the aluminium that at first will need to weld, aluminium alloy carry out surface treatment and remove greasy dirt, foul and oxide-film, elder generation's alkali cleaning is with containing 5～50%(weight) sodium hydrate aqueous solution washes, Controllable Temperature between 10 ℃～60 ℃, alkali cleaning after washing, pickling again after the washing.Pickling is with containing 5～50%(weight) place 0.5～20%(weight in the aqueous solution of nitric acid) liquid of metallic zinc soaks or steeps.Washing again after the pickling, dry then.The solder fusing of selecting for use is become flow-like, dried position for the treatment of that weldment need weld is coated with, sprays or soak and hang up the good scolder of fusing, treat as required that weldment superposes or assembled formation after be heated to 100 ℃～600 ℃ coolings immediately or the cooling of insulation back.This method not only can brazed aluminum and aluminium, aluminium and aluminium alloy, aluminium alloy and aluminium alloy combine the weld seam of heat exchanger, can also the soldering aluminum or aluminum alloy and the heat exchanger weld seam that combines of copper, copper alloy, iron, the aluminium section bar that is used for the welding of aluminum heat exchanger is thin aluminium or ultra-thin aluminium, so this method also can be welded the weld seam that thin aluminium and ultra-thin aluminium combine.
Heat exchanger with production method energy brazed aluminum of the present invention and Al-alloy heat exchanger, aluminium and copper, iron combine can also weld the weld seam that thin aluminium and ultra-thin aluminium combine.The tensile strength of weld seam is 7～10Kg/mm
2, the Metallographic Analysis of weld seam does not have defectives such as slag inclusion, pore-free, nothing are loose, and weld seam and weldment fuse into one, and surface clean does not have corrosion.
The heat exchanger that method of the present invention suitable weldering aluminium and Al-alloy heat exchanger, aluminium and copper, iron combine, because heat exchanger is made with thin aluminium, so the method can also be welded the drought seam of thin aluminium and the combination of ultra-thin aluminium, also can weld the weld seam that aluminum or aluminum alloy and copper, copper alloy, iron combine, be particularly suitable for the soldering of automobile aluminium radiator.This method for welding without high temperature, without vacuum drying oven, also need not common stove and protective gas; just can carry out soldering in atmosphere, it can utilize a bit simple equipment of equipment increase of present production of copper or copper alloy heat sink just can produce the aluminum or aluminum alloy radiator in this way.Greasy dirt, foul and oxide-film are removed in the surface of materials such as the aluminium that at first will need to weld, aluminium alloy, copper, copper alloy, iron, with containing 5～50%(weight) sodium hydrate aqueous solution carries out alkali cleaning, and Controllable Temperature is between 10 ℃～60 ℃.The concentration of lye height, the alkali cleaning time is just short, if concentration of lye is low, then the alkali cleaning time is just longer.In with a kind of concentration, high alkali cleaning time of temperature is short, and concentration of lye is low, then the alkali cleaning time just longer, be advisable to eliminate greasy dirt, foul and oxide-film and don't to corrode material to be welded in a word.Wash with water after the alkali cleaning, remaining alkali lye removed, and then with containing 5～50%(weight) place 0.5～20%(weight in the aqueous solution of nitric acid) the liquid of metallic zinc soak or steep.If the concentration of solution is low, then the time of pickling can be longer, can be placed in the solution many some times of bubble even, and concentration Gao Zeke is placed on to soak in the solution and just takes out.Wash with water again after the pickling, remove residual acid solution, then with drying to be welded.Select suitable scolder and be fused into fluid state according to material to be welded; with the spray of the scolder after the fusing; be coated with or soak to hang over and treat that weldment needs the position of weldment; to have as required then scolder treat that weldment superposes or assembled formation after be heated to 100 ℃～600 ℃ after cooling; if the temperature height of heating; can cool off immediately after the heating; if the temperature limit on the low side of heating; in order to guarantee the quality of weld seam; can be incubated a period of time cooling after the heating; the length of temperature retention time can come to determine as required, does not need during heating to be placed in the vacuum drying oven, does not also need to be placed in the general heating furnace and uses gas shield; can in atmosphere, heat; as long as thermal source is arranged, it is just passable to reach the temperature that needs, and weld seam and matrix that this method for welding welds out fuse into one; the noresidue solder flux, the weld seam light; clean; attractive in appearance.
Claims (4)
1, the method for a kind of brazed aluminum and Al-alloy heat exchanger is characterized in that:
A will treat that weldment carries out surface treatment: alkali cleaning → washing → pickling → washing → drying;
B becomes flow-like with solder fusing, and the place to be welded that will treat weldment then is coated with, sprays or soak and hangs up scolder;
C with the existing scolder of part to be welded treat weldment superpose on demand or assemble after be heated to 100 ℃～600 ℃ coolings immediately or the cooling of insulation back.
2, production method according to claim 1 is characterized in that: alkali cleaning contains 5～50%(weight with 10 ℃～60 ℃) sodium hydrate aqueous solution carries out alkali cleaning.
3, production method according to claim 2 is characterized in that: pickling is with containing 5～50%(weight) place 0.5～20%(weight in the aqueous solution of nitric acid) liquid of metallic zinc soaks or steeps.
4, according to claim 1,2 or 3 described production methods, it is characterized in that: the weld seam that can brazed aluminum makes up with aluminium, aluminium and aluminium alloy, aluminium alloy and aluminium alloy, also can the soldering aluminum or aluminum alloy and the weld seam that combines of copper, copper alloy and iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102622 CN1067199A (en) | 1992-04-08 | 1992-04-08 | Method for brazing aluminum heat exchanger in air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102622 CN1067199A (en) | 1992-04-08 | 1992-04-08 | Method for brazing aluminum heat exchanger in air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1067199A true CN1067199A (en) | 1992-12-23 |
Family
ID=4939754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102622 Pending CN1067199A (en) | 1992-04-08 | 1992-04-08 | Method for brazing aluminum heat exchanger in air |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1067199A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596632B (en) * | 2009-07-03 | 2011-11-16 | 西安交通大学 | Brazing method of aluminum material and copper material in air atmosphere |
| CN102310241A (en) * | 2010-07-01 | 2012-01-11 | 广东万和新电气股份有限公司 | Method for manufacturing aluminium heat exchanger of gas water heater |
| CN103157862A (en) * | 2011-12-16 | 2013-06-19 | 株式会社电装 | Manufacturing method of heat exchanger, and heat exchanger manufactured by such manufacturing method |
| CN105408051A (en) * | 2013-07-26 | 2016-03-16 | 株式会社电装 | Method for manufacturing and device for manufacturing aluminum product |
| CN104816102B (en) * | 2015-05-18 | 2016-10-05 | 苏州优诺电子材料科技有限公司 | Heat conduction fixed connection method between a kind of parts and the solder of use thereof |
| CN114951875A (en) * | 2022-07-29 | 2022-08-30 | 新乡市特美特热控技术股份有限公司 | Cleaning process before vacuum brazing welding of iron white copper plate fin type heat exchanger core |
-
1992
- 1992-04-08 CN CN 92102622 patent/CN1067199A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596632B (en) * | 2009-07-03 | 2011-11-16 | 西安交通大学 | Brazing method of aluminum material and copper material in air atmosphere |
| CN102310241A (en) * | 2010-07-01 | 2012-01-11 | 广东万和新电气股份有限公司 | Method for manufacturing aluminium heat exchanger of gas water heater |
| CN103157862A (en) * | 2011-12-16 | 2013-06-19 | 株式会社电装 | Manufacturing method of heat exchanger, and heat exchanger manufactured by such manufacturing method |
| CN105408051A (en) * | 2013-07-26 | 2016-03-16 | 株式会社电装 | Method for manufacturing and device for manufacturing aluminum product |
| CN104816102B (en) * | 2015-05-18 | 2016-10-05 | 苏州优诺电子材料科技有限公司 | Heat conduction fixed connection method between a kind of parts and the solder of use thereof |
| CN114951875A (en) * | 2022-07-29 | 2022-08-30 | 新乡市特美特热控技术股份有限公司 | Cleaning process before vacuum brazing welding of iron white copper plate fin type heat exchanger core |
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