Patent US4121750A successfully refreshed from Google Patents.
US4121750A
Expired / Lapsed
US
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Processes for soldering aluminum-containing workpieces
Assignee: Vereinigte Aluminium Werke AG
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Filing: 1976-10-04
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Granted: 1978-10-24
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Expires: 1996-10-04
Abstract
Abstract Processes and compositions for soldering aluminum-containing workpieces wherein the solder contains components which lower the surface tension and the viscosity of the molten solder, and which lower the interfacial tension between the solder and the aluminum-containing workpieces. Useful components are bismuth, strontium, barium and antimony. The solder may be used with or without flux.
Inventors
- 👤 Heinz Schoer
- 👤 Werner Schultze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:51
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; B23K35/288
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
159 words
A method of joining aluminum workpieces bearing an aluminum oxide surface layer which comprises: interposing between said workpieces an aluminum-silicon filler material consisting essentially of aluminum containing from 6 to 20% by weight of silicon and from 0.01 to 10.0% by weight of an aluminum wetting agent selected from the group consisting of bismuth, antimony, strontium and barium, heating said workpieces in contact with said filler material with a heating device to a temperature in the range from about 590° C. to about 605° C. wherein the resulting viscosity and surface tension of said filler material at said temperature is less than the viscosity and surface tension of said filler material in the absence of said wetting agent and the interfacial tension between said filler material and said workpieces is lower than the interfacial tension in the absence of said wetting agent and, performing said heating step in a substantially non-oxidizing atmosphere and in the absence of a flux.
Claim 2
Independent Claim
159 words
A method of joining aluminum workpieces bearing an aluminum oxide surface layer which comprises: interposing between said workpieces an aluminum-silicon filler material consisting essentially of aluminum containing from 6 to 20% by weight of silicon and from 0.01 to 10.0% by weight of an aluminum wetting agent selected from the group consisting of bismuth, antimony, strontium and barium, heating said workpieces in contact with said filler material with a heating device to a temperature in the range from about 590° C. to about 605° C. wherein the resulting viscosity and surface tension of said filler material at said temperature is less than the viscosity and surface tension of said filler material in the absence of said wetting agent and the interfacial tension between said filler material and said workpieces is lower than the interfacial tension in the absence of said wetting agent and, performing said heating step in a substantially non-oxidizing atmosphere and in the absence of a flux.
Claim 3
Dependent Claim
21 words
A method as defined in claim 1 wherein said filler metal contains about 0.05 to 2.0% by weight of said substance.
Claim 4
Dependent Claim
195 words
In the method of joining aluminum containing workpieces which comprises heating in contact with said aluminum containing workpieces a filler metal having a normal viscosity and a normal surface tension in its molten state and a normal interfacial tension between said molten filler metal and said workpieces, the improvement which comprises: interposing between said workpieces a filler metal consisting essentially of zinc, about 2 to 25% by weight of aluminum, up to about 1% by weight of manganese and about 0.01% to about 10.0% by weight of at least one substance selected from the group consisting of bismuth, strontium, barium and antimony to substantially decrease the normal interfacial tension between said molten filler metal and said workpieces and to lower the normal viscosity and the normal surface tension of said molten filler metal, maintaining said workpieces and said filler metal in a substantially non-oxidizing atmosphere, non-exothermically raising the temperature of said filler metal in said substantially non-oxidizing atmosphere until said filler metal has reached a molten condition, said temperature raising step being performed in the absence of a flux and said filler metal being raised to a temperature substantially below the melting point of aluminum.
Claim 5
Dependent Claim
195 words
In the method of joining aluminum containing workpieces which comprises heating in contact with said aluminum containing workpieces a filler metal having a normal viscosity and a normal surface tension in its molten state and a normal interfacial tension between said molten filler metal and said workpieces, the improvement which comprises: interposing between said workpieces a filler metal consisting essentially of zinc, about 2 to 25% by weight of aluminum, up to about 1% by weight of manganese and about 0.01% to about 10.0% by weight of at least one substance selected from the group consisting of bismuth, strontium, barium and antimony to substantially decrease the normal interfacial tension between said molten filler metal and said workpieces and to lower the normal viscosity and the normal surface tension of said molten filler metal, maintaining said workpieces and said filler metal in a substantially non-oxidizing atmosphere, non-exothermically raising the temperature of said filler metal in said substantially non-oxidizing atmosphere until said filler metal has reached a molten condition, said temperature raising step being performed in the absence of a flux and said filler metal being raised to a temperature substantially below the melting point of aluminum.
Claim 6
Dependent Claim
15 words
A method as defined in claim 3 wherein said filler metal is free of Si.
Claim 7
Dependent Claim
19 words
A method as defined in claim 3 wherein said filler metal contains up to 26% by weight of aluminum.
Claim 8
Dependent Claim
19 words
A method as defined in claim 3 wherein said filler metal contains at least 26% by weight of aluminum.
Claim 9
Dependent Claim
173 words
In the method of joining aluminum workpieces which comprises heating in contact with said aluminum workpieces an aluminum-silicon filler metal having a normal viscosity and a normal surface tension in its molten condition and a normal interfacial tension between said molten filler metal and said workpieces, the improvement which comprises: interposing between said workpieces an aluminum-silicon base filler metal containing at least about 0.01% by weight of at least one substance selected from the group consisting of bismuth, strontium, barium and antimony to substantially decrease the normal interfacial tension between said molten filler metal and said workpieces and to lower the normal viscosity and the normal surface tension of said molten filler metal, maintaining said workpiece and said filler metal in a substantially non-oxidizing atmosphere, raising the temperature of said filler metal with a heating device in said substantially non-oxidizing atmosphere until said filler metal has reached a molten state, and performing said temperature raise in the absence of a flux and said raised temperature being substantially below the melting point of aluminum.
Claim 10
Dependent Claim
173 words
In the method of joining aluminum workpieces which comprises heating in contact with said aluminum workpieces an aluminum-silicon filler metal having a normal viscosity and a normal surface tension in its molten condition and a normal interfacial tension between said molten filler metal and said workpieces, the improvement which comprises: interposing between said workpieces an aluminum-silicon base filler metal containing at least about 0.01% by weight of at least one substance selected from the group consisting of bismuth, strontium, barium and antimony to substantially decrease the normal interfacial tension between said molten filler metal and said workpieces and to lower the normal viscosity and the normal surface tension of said molten filler metal, maintaining said workpiece and said filler metal in a substantially non-oxidizing atmosphere, raising the temperature of said filler metal with a heating device in said substantially non-oxidizing atmosphere until said filler metal has reached a molten state, and performing said temperature raise in the absence of a flux and said raised temperature being substantially below the melting point of aluminum.
Claim 11
Dependent Claim
19 words
A method as defined in claim 7 wherein said filler metal comprises at least 6% by weight of Si.
Claim 12
Dependent Claim
28 words
A method as defined in claim 7 wherein said filler metal comprises substantially 6-20% by weight of Si and substantially 0.01 to 10% by weight of said substance.
Claim 13
Dependent Claim
29 words
A method as defined in claim 7 wherein said filler metal comprises at least one substance selected from the group consisting of Cu, Mg, Ni, Sn, Zn, and Cd.
Claim 14
Dependent Claim
73 words
A method as defined in claim 10 wherein said filler metal comprises substantially 0.05 to 4.7% by weight of Cu where present, substantially 0.05 to 10% by weight of Mg where present, substantially 0.03 to 4% by weight of Ni where present, substantially 0.03 to 12% by weight of Sn where present, substantially 9.3 to 10.7% by weight of Zn where present, and substantially 0.03 to 12% by weight of Cd where present.
Claim 15
Dependent Claim
17 words
A method as defined in claim 11 wherein the remainder of said filler metal is substantially Al.
Claim 16
Dependent Claim
25 words
A method as defined in claim 7 which comprises raising the temperature of said filler metal to between about 590° C. and about 605° C.
Claim 17
Dependent Claim
29 words
A method as defined in claim 7 which comprises maintaining said workpieces and said filler metal at a pressure greater than about 10 -1 torr. during said joining operationg.
Claim 18
Dependent Claim
21 words
A method as defined in claim 7 wherein said filler metal contains about 0.05 to 2.0% by weight of said substance.
Claim 19
Dependent Claim
21 words
A method as defined in claim 7 wherein said filler metal contains up to about 10% by weight of said substance.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |