Claims
- 1. A process for joining aluminum parts by brazing to produce an assembly, the process comprising:
- (a) providing a composite sheet having an aluminum core alloy material and a filler alloy cladding, applied to the core alloy material, the cladding comprising about 4 to 18 wt. % silicon; about 0.01 to 0.30 wt. % lithium; not more than about 2 wt. % zinc; not more than about 1 wt. % manganese; not more than about 0.30 wt. % iron; not more than about 0.10 wt. % copper; not more than about 0.05 wt. % magnesium; not more than 0.15 wt. % impurities; balance aluminum;
- (b) contacting an aluminum part with the filler alloy cladding;
- (c) brazing the aluminum part and the composite sheet to produce a brazed assembly.
- 2. The process of claim 1 wherein the brazing occurs in a reduced atmosphere environment.
- 3. The process of claim 1 wherein the brazing occurs at a pressure greater than atmospheric.
- 4. The process of claim 1 further comprises applying a flux to the aluminum part prior step (c).
- 5. The process of claim 4 is selected from the group consisting of chlorides, fluorides, and mixtures thereof.
- 6. The process of claim 1 wherein the assembly is a heat exchanger.
- 7. The process of claim 1 wherein the assembly is an evaporator.
- 8. The process of claim 1 wherein the filler alloy comprises a lithium content ranging from about 0.01 to 0.18 wt. %.
- 9. The process of claim 1 wherein the brazing composite core material is selected from the group consisting of the Aluminum Association 3XXX, 5XXX, and 6XXX series aluminum alloys.
Parent Case Info
This is a continuation of application Ser. No. 08/365,789, filed Dec. 29, 1994, now U.S. Pat. No. 5,535,939, which is in turn a divisional application of application Ser. No. 08/195,067, filed Feb. 14, 1994, now U.S. Pat. No. 5,422,191, issued Jun. 6, 1995.
US Referenced Citations (11)
Foreign Referenced Citations (4)
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59-100249 |
Jun 1984 |
JPX |
91963 |
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Divisions (1)
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Number |
Date |
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Parent |
195067 |
Feb 1994 |
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Continuations (1)
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Number |
Date |
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365789 |
Dec 1994 |
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