US4842185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of brazing a heat exchanger using a reaction flux
Assignee: MA Aluminum Corp
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Filing: 1987-04-06
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Granted: 1989-06-27
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Expires: 2007-04-06
Abstract
Abstract A method of producing a heat exchanger comprising abutting a tube made of an aluminum material and fins made of an aluminum material, applying to the resulting abutments a flux containing zinc halide, and thereafter conducting a reaction soldering in an inert gas atmosphere. The assembled tube and fins applied with the flux may be moved into a position to enhance the formation if zinc deposited by the reaction soldering during the drying step of the flux. The heat exchanger produced by this method has a thick and uniform Zn coating at the joints with good mechanical strength and surface conditions.
Inventors
- 👤 Hajime Kudo
- 👤 Masami Asano
- 👤 Ken Toma
- 👤 Yo Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:54
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/282; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B23K1/00; B23K1/0008; B23K1/0012; B23K35/34; B23K35/36; B23K35/3601; B23K35/3603; F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; F28D1/0478
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
67 words
A method of producing a heat exchanger comprising abutting a tube made of an aluminum material and fins made of an aluminum material, applying to the resulting abutments a flux containing 10-50 weight % of zinc chloride and 10-60 weight % of Zn powder, drying at a temperature of from about 100° to 300° C., and thereafter reaction soldering the heat exchanger in an inert gas atmosphere.
Claim 2
Independent Claim
67 words
A method of producing a heat exchanger comprising abutting a tube made of an aluminum material and fins made of an aluminum material, applying to the resulting abutments a flux containing 10-50 weight % of zinc chloride and 10-60 weight % of Zn powder, drying at a temperature of from about 100° to 300° C., and thereafter reaction soldering the heat exchanger in an inert gas atmosphere.
Claim 3
Dependent Claim
26 words
The method of producing a heat exchanger according to claim 1, wherein said tube is made of an aluminum alloy containing 0.1-3 weight % of Zn.
Claim 4
Dependent Claim
26 words
The method of producing a heat exchanger according to claim 1, wherein said fins are made of an aluminum alloy containing 0.3-6.5 weight % of Zn.
Claim 5
Dependent Claim
32 words
The method of producing a heat exchanger according to claim 1, wherein said fins are made of an aluminum alloy containing 0.3-6.5 weight % of Zn and 0.1-2.2 weight % of Mg.
Claim 6
Dependent Claim
32 words
The method of producing a heat exchanger according to claim 1 wherein during the drying said heat exchanger is positioned to enhance the formation of the fillet deposited by the reaction soldering.
Claim 7
Dependent Claim
29 words
The method of producing a heat exchanger according to claim 5, wherein said heat exchanger is positioned 30 seconds to 30 minutes after the initiation of the drying step.
Claim 8
Dependent Claim
24 words
The method of producing a heat exchanger according to claim 1, wherein said inert gas has a dew point of -10° C. or less.
Claim 9
Dependent Claim
17 words
The method of producing a heat exchanger according to claim 7, wherein said inert gas is Ar.
Claim 10
Dependent Claim
19 words
The method of producing a heat exchanger according to claim 7, wherein said inert gas is N 2 .
Claim 11
Dependent Claim
17 words
The method of producing a heat exchanger according to claim 7, wherein said inert gas is flowing.
Claim 12
Dependent Claim
35 words
The method of producing a heat exchanger according to claim 10, wherein said inert gas is flowing at a speed of 1×10 -3 -1 m/s in the vicinity of said flux applied to said joints.
Claim 13
Dependent Claim
17 words
The method of producing a heat exchanger according to claim 1, wherein said inert gas is Ar.
Claim 14
Dependent Claim
19 words
The method of producing a heat exchanger according to claim 1, wherein said inert gas is N 2 .
Claim 15
Dependent Claim
17 words
The method of producing a heat exchanger according to claim 1, wherein said inert gas is flowing.
Claim 16
Dependent Claim
35 words
The method of producing a heat exchanger according to claim 14, wherein said inert gas is flowing at a speed of 1×10 -3 -1 m/s in the vicinity of said flux applied to said joints.
Claim 17
Dependent Claim
35 words
The method of producing a heat exchanger according to claim 1, wherein said inert gas is flowing at a speed of 1×10 -3 -1 m/s in the vicinity of said flux applied to said joints.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |