Patent US739283A successfully refreshed from Google Patents.
Patent US3855679A successfully refreshed from Google Patents.
US3855679A
Expired / Lapsed
US
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Aluminum soldering
Assignee: Ford Motor Co
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Filing: 1973-11-05
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Granted: 1974-12-24
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Expires: 1993-11-05
Abstract
Abstract A method is disclosed of effecting a corrosion resistant joint between the surface of an untreated aluminum part and the surface of a heat sensitive dissimilar metal part having a maximum tolerance temperature level. After anhydrous fluxing, a first soldering composition is adhered to a depression in the aluminum part or other equivalent means to maintain residency of the first solder until the flux reacts. The first soldering compression should be deposited with a thickness across the joint of at least 0.003 inch. The first composition consists essentially of lead, 1-10 percent tin, a significant amount of silver up to 5 percent and not over 0.1 percent antimony. After a second organic or acid fluxing, a second soldering composition is then employed having a melting temperature below said tolerance level; while in the heated condition the heat sensitive part is joined to the soldered assembly.
Inventors
- 👤 D Schmatz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:41
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/19; B23K35/00; B23K35/001; B23K35/002; B23K35/22; B23K35/24; B23K35/26; B23K35/268; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12687; Y10T428/12736; Y10T428/1275
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
195 words
A METHOD OF EFFECTING A CORROSION RESISTANT JOINT BETWEEN THE SURFACE OF AN UNTREATED ALUMINUM PART AND THE SURFACE OF A HEAT SENSITIVE DISSIMILAR METAL PART HAVING A MAXIMUM TOLERANCE TEMPERATURE LEVEL, COMPRISING: A. APPLYING AN ANHYDROUS FLUX TO AT LEAST SAID SURFACE OF THE UNTREATED ALUMINUM PART, B. APPLYING A FIRST SOLDER TO AT LEAST THE FLUXED SURFACE OF THE ALUMINUM PART, SAID FIRST SOLDER CONSISTING ESSENTIALY OF LEAD, 1-10 PERCENT TIN, A SIGNIFICANT AMOUNT OF SILVER UP TO 5 PERCENT, AND NOT OVER 0.1 PERCENT ANTIMONY, C. HEATING SAID SURFACE AND SOLDER TO A TEMPERATURE ABOVE THE MAXIMUM TOLERANCE TEMPERATURE LEVEL OF SAID DISSIMILAR METAL PART FOR A PERIOD OF TIME SUFFICIENT TO ESTABLISH A SILVER RICH INTERFACE BETWEEN THE ALUMINUM AND SAID FIRST SOLDER AND THEREAFTER PERMITTING SAID SURFACE AND SOLDER TO COOL, D. FLUXING SAID FIRST SOLDER ON THE ALUMINUM PART WITH A SECOND FLUX, E. APPLYING A CORROSION RESISTANT SECOND SOLDER TO THE REFLUXED FIRST SOLDER, SAID SECOND SOLDER HAVING A MELTING RANGE BELOW SAID MAXIMUM TOLERANCE TEMPERATURE LEVEL, AND F. MELTING SAID SECOND SOLDER WHILE ATTACHTING SAID HEAT SENSITIVE PART TO SAID HEATED SECOND SOLDER TO COMPLETE SAID JOINT.
Claim 2
Independent Claim
195 words
A METHOD OF EFFECTING A CORROSION RESISTANT JOINT BETWEEN THE SURFACE OF AN UNTREATED ALUMINUM PART AND THE SURFACE OF A HEAT SENSITIVE DISSIMILAR METAL PART HAVING A MAXIMUM TOLERANCE TEMPERATURE LEVEL, COMPRISING: A. APPLYING AN ANHYDROUS FLUX TO AT LEAST SAID SURFACE OF THE UNTREATED ALUMINUM PART, B. APPLYING A FIRST SOLDER TO AT LEAST THE FLUXED SURFACE OF THE ALUMINUM PART, SAID FIRST SOLDER CONSISTING ESSENTIALY OF LEAD, 1-10 PERCENT TIN, A SIGNIFICANT AMOUNT OF SILVER UP TO 5 PERCENT, AND NOT OVER 0.1 PERCENT ANTIMONY, C. HEATING SAID SURFACE AND SOLDER TO A TEMPERATURE ABOVE THE MAXIMUM TOLERANCE TEMPERATURE LEVEL OF SAID DISSIMILAR METAL PART FOR A PERIOD OF TIME SUFFICIENT TO ESTABLISH A SILVER RICH INTERFACE BETWEEN THE ALUMINUM AND SAID FIRST SOLDER AND THEREAFTER PERMITTING SAID SURFACE AND SOLDER TO COOL, D. FLUXING SAID FIRST SOLDER ON THE ALUMINUM PART WITH A SECOND FLUX, E. APPLYING A CORROSION RESISTANT SECOND SOLDER TO THE REFLUXED FIRST SOLDER, SAID SECOND SOLDER HAVING A MELTING RANGE BELOW SAID MAXIMUM TOLERANCE TEMPERATURE LEVEL, AND F. MELTING SAID SECOND SOLDER WHILE ATTACHTING SAID HEAT SENSITIVE PART TO SAID HEATED SECOND SOLDER TO COMPLETE SAID JOINT.
Claim 3
Dependent Claim
29 words
The method as in claim 1, in which means is employed to retain the residency of said first solder in a predetermined location on said aluminum part during heating.
Claim 4
Dependent Claim
19 words
The method as in claim 2, in which said means comprises a depression in the surface of said part.
Claim 5
Dependent Claim
44 words
The method as in claim 1, in which the temperature above which said first solder is heated is determined by the chemistry thereof, and the second solder having a melting temperature at an interval below the maximum tolerance temperature of said heat sensitive component.
Claim 6
Dependent Claim
30 words
The method as in claim 1, in which said anhydrous flux is comprised of about 88 percent ZnCl, 10 percent NH4 Cl, 2 percent NaF in a dry organic solvent.
Claim 7
Dependent Claim
19 words
A method as in claim 1, in which said first solder contains 3-5 percent tin and 2-3 percent silver.
Claim 8
Dependent Claim
35 words
The method as in claim 1, in which said second solder is specifically of a tin-lead binary metallurgical system having lead in the range of 22-45 percent and tin in the range of 55-78 percent.
Claim 9
Dependent Claim
23 words
The method as in claim 1, in which said joint is washed prior to step (d) in hot water to remove chloride residuals.
Claim 10
Dependent Claim
13 words
The method as in claim 1, in which said second flux is rosin.
Claim 11
Dependent Claim
9 words
The resulting product of the method of claim 1.
Claim 12
Dependent Claim
36 words
The product of claim 10 wherein the aluminum part and dissimilar metal is connected by a layer of high melting solder 2Ag - 3Sn - 95Pb and a layer of low melting solder 63Sn - 37Pb.
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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) | 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 |