US3807033A
Expired / Lapsed
US
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Joining process
Assignee: Vereinigte Aluminium Werke AG
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Filing: 1972-08-29
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Granted: 1974-04-30
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Expires: 1992-08-29
Abstract
Abstract A process for the fluxless soldering of aluminum-containing workpieces in substantially non-oxidizing atmospheres is carried out with a solder which contains 2-45% by weight of Al and at least one additive from the group consisting of Bi Sr, Ba, Sb and Be, the balance being Zn. The additives Bi, Sr, Ba and Sb constitute 0.01-10% by weight and the additive Be constitutes 0.00001-1.0% by weight of the solder. These additives lower the viscosity and surface tension of the molten solder and also decrease the interfacial tension between the molten solder and the workpieces.
Inventors
- 👤 H Schoer
- 👤 W Schultze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:06
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/282
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
18 words
In a process as defined in claim 1, wherein said filler metal contains 0.002-0.1% by weight of Be.
Claim 2
Dependent Claim
112 words
In a process of brazing aluminum-containing workpieces, the step of brazing said workpieces with a filler metal consisting essentially of 26-45% by weight of Al, up to about 1% by weight of Mn, 0.00001-1.0% by weight of Be, and 0.01-10% by weight of at least one substance selected from the group consisting of Bi, Sr, Ba and Sb, the remainder being substantially Zn, said Bi, Sr, Ba, Sb and Be lowering the viscosity and surface tension of said filler metal in its molten state and substantially decreasing the interfacial tension between the molten filler metal and said workpieces, and said step being performed without a flux and in a substantially non-oxidizing atmosphere.
Claim 3
Dependent Claim
22 words
In a process as defined in claim 3, wherein said filler metal contains 0.05-2% by weight of said at least one substance.
Claim 4
Dependent Claim
18 words
In a process as defined in claim 3, wherein said filler metal contains 0.002-0.1% by weight of Be.
Claim 5
Dependent Claim
29 words
In a process as defined in claim 1, wherein said filler metal contains 32.73% by weight of Al, 0.09% by weight of Be, and 0.03% by weight of impurities.
Claim 6
Dependent Claim
73 words
In a process of soldering aluminum-containing workpieces, the step of soldering said workpieces with a solder consisting essentially of 4.18% by weight of Al, 0.06% by weight of Be, 0.86% by weight of Mn, and 0.10% by weight of impurities, the remainder being substantially Zn, said Be lowering the viscosity and surface tension of said solder in its molten state and substantially decreasing the interfacial tension between the molten solder and said workpieces.
Claim 7
Dependent Claim
75 words
In a process of soldering aluminum-containing workpieces, the step of soldering said workpieces with a solder consisting essentially of 4.55% by weight of Al, 0.16% by weight of Bi, 0.02% by weight of Be, and 0.08% by weight of impurities, the remainder being substantially Zn, said Be and Bi lowering the viscosity and surface tension of said solder in its molten state and substantially decreasing the interfacial tension between the molten solder and said workpieces.
Claim 8
Dependent Claim
82 words
In a process of brazing aluminum-containing workpieces, the step of brazing said workpieces with a brazing alloy consisting essentially of 39.88% by weight of Al, 0.06% by weight of Bi, 0.01% by weight of Be, 0.37% by weight of Mn, and 0.05% by weight of impurities, the remainder being substantially Zn, said Be and Bi lowering the viscosity and surface tension of said brazing alloy in its molten state and substantially decreasing the interfacial tension between the molten solder and said workpieces.
References Cited (Backward Citations)
US2733168A
Cited
US722273A
Cited
US1612151A
Cited
US3370343A
Cited
US3480465A
Cited
US3457630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |