Patent US3855682A successfully refreshed from Google Patents.
US3855682A
Expired / Lapsed
US
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Method of soldering together an aluminum part and a ferrous or cuprous metal part
Assignee: Chausson Usines SA
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Filing: 1973-04-02
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Granted: 1974-12-24
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Expires: 1993-04-02
Abstract
Abstract To join an aluminum containing first part to a second part, the second part is coated with a soldering alloy melting at a temperature lower than 320*C, the first part and the second part are assembled and the assembly is subjected to an organic flux containing a metal fluoborate reducible by aluminum at a temperature lower than 320*C. The fluxed assembly is then heated to melting point of the soldering alloy.
Inventors
- 👤 A Chartet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:37
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/34; B23K1/00; B23K1/0008; B23K1/0012; B23K1/19; B23K35/24; B23K35/26; F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28D1/05366; B23K2103/00; B23K2103/02; B23K2103/08; B23K2103/10; B23K2103/12; B23K2103/18; B23K2103/20; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49393
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
A METHOD FOR JOINING TOGETHER AN ALUMINUM CONTAINING FIRST PART AND A SECOND PART MADE OF A METAL SELECTED FROM THE GROUP CONSISTING OF FERROUS AND CUPROUS METALS COMPRISING THE STEPS OF: COATING THE SURFACE OF THE SECOND PART WITH A SOLDERING ALLOY HAVING A MELTING POINT AT A TEMPERATURE LOWER THAN 320*C, ASSEMBLING THE FIRST PART AND THE SECOND PART, SUBJECTING THE ASSEMBLY TO AN ORGANIC FLUX CONTAINING AN AQUEOUS SOLUTION OF TRIETHANOLAAINE, DIETHYLENETRIAMINE AND A METAL FLUOBORATE WHICH CAN BE REDUCED BY ALUMINUM AT A TEMPERATURE LOWER THAN 320*C, HEATING THE ASSEMBLY AND THE FLUX AT LEAST TO SAID TEMPERATURE WHEREBY THE METAL IN THE FLUOBORATE IS REDUCED OUT AND DEPOSITED AS A PROTECTIVE COATING ON THE ALIMINUM OF THE FIRST PART AFTER REMOVING THE ALUMINA LAYER FROM THE ALUMINUM, HEATING THE FLUXED ASSEMBLY UP TO MELTING POINT OF THE SOLDERING ALLOY, WHEREBY THE SOLDERING ALLOY WETS THE ALUMINUM CONTAINING PART AND IS MADE ADHERING THERETO, SAID PROTECTIVE COATIN FORMING AN INTERPENETRATION LAYER.
Claim 2
Independent Claim
165 words
A METHOD FOR JOINING TOGETHER AN ALUMINUM CONTAINING FIRST PART AND A SECOND PART MADE OF A METAL SELECTED FROM THE GROUP CONSISTING OF FERROUS AND CUPROUS METALS COMPRISING THE STEPS OF: COATING THE SURFACE OF THE SECOND PART WITH A SOLDERING ALLOY HAVING A MELTING POINT AT A TEMPERATURE LOWER THAN 320*C, ASSEMBLING THE FIRST PART AND THE SECOND PART, SUBJECTING THE ASSEMBLY TO AN ORGANIC FLUX CONTAINING AN AQUEOUS SOLUTION OF TRIETHANOLAAINE, DIETHYLENETRIAMINE AND A METAL FLUOBORATE WHICH CAN BE REDUCED BY ALUMINUM AT A TEMPERATURE LOWER THAN 320*C, HEATING THE ASSEMBLY AND THE FLUX AT LEAST TO SAID TEMPERATURE WHEREBY THE METAL IN THE FLUOBORATE IS REDUCED OUT AND DEPOSITED AS A PROTECTIVE COATING ON THE ALIMINUM OF THE FIRST PART AFTER REMOVING THE ALUMINA LAYER FROM THE ALUMINUM, HEATING THE FLUXED ASSEMBLY UP TO MELTING POINT OF THE SOLDERING ALLOY, WHEREBY THE SOLDERING ALLOY WETS THE ALUMINUM CONTAINING PART AND IS MADE ADHERING THERETO, SAID PROTECTIVE COATIN FORMING AN INTERPENETRATION LAYER.
Claim 3
Dependent Claim
38 words
A method as set forth in claim 1, wherein the first part is a heat disturber and the second part is a tube, a plurality of heat disturbers and tubes being assembled to form a heat exchanger core.
Claim 4
Dependent Claim
27 words
A method as set forth in claim 1, wherein the metal fluoborate comprises at least one member of the group consisting of zinc, cadmium and tin fluorborate.
Claim 5
Dependent Claim
28 words
A method as set forth in claim 1, wherein the flux has a composition wherein each mole of the metal fluoborate corresponds at least two moles of diethylenetriamine.
Claim 6
Dependent Claim
12 words
A method as set forth in claim 1, wherein the flux comprises:
Claim 7
Dependent Claim
19 words
A method as set forth in claim 5, wherein the flux is diluted into an equivalent weight of water.
Claim 8
Dependent Claim
41 words
A method as set forth in claim 1, wherein the soldering alloy is selected from the group consisting of: zinc-cadmium alloys lead-tin-cadmium-zinc alloys tin-zinc alloys lead-tin-cadmium alloys lead-tin-zinc alloys tin-lead alloys the melting temperatures of which being always lower than 320*C.
Claim 9
Dependent Claim
38 words
A method as set forth in claim 1 wherein melting of the soldering alloy is performed in an oven immediately after dePosit of the organic flux and by passing the assembly in said oven during about 1 minute.
Claim 10
Dependent Claim
23 words
A method as set forth in claim 1, wherein melting of the soldering alloy is performed in an oven wherein gas is pulsed.
Claim 11
Dependent Claim
27 words
A method as set forth in claim 1, wherein melting of the soldering alloy is performed in an oven at a temperature between about 300* to 320*C.
Claim 12
Dependent Claim
32 words
A method as set forth in claim 1, wherein said first part is made of an aluminium containing alloy containing no more than 5 percent of silicium and 1.5 percent of magnesium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |