US5102033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving the fillet-forming capability of aluminum vacuum brazing sheet products
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1991-04-16
•
Granted: 1992-04-07
•
Expires: 2011-04-16
Abstract
Abstract The fillet-forming ability of brazeable aluminum alloy materials, such as brazing sheet or heat exchanger components, for example fins, tubes and headers, is significantly improved by treating the material, prior to brazing, with an aqueous acid solution containing a dilute mixture of HF and HNO3. The treatment generally takes place for a period of not less than 5 seconds within the temperature range from about 15 to about 98 DEG C.
Inventors
- 👤 Ralph A. Woods
- 👤 Arthur C. Scott
- 👤 Dennis D. Przybycien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:12
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/20; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20; B23K2101/00; B23K2101/04; B23K2101/14; B23K2103/00; B23K2103/08; B23K2103/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49393
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A method for improving the fillet-forming ability of brazeable aluminum alloy materials by treating the material, prior to brazing, with an aqueous solution containing from 0.05 to 5% by wt. HF and from 1 to about 20% by wt. HNO 3 whereby the aqueous solution is heated to a temperature in the range from 15° C. to 98° C. for a time period not less than 5 seconds and recovering the treated material.
Claim 2
Independent Claim
73 words
A method for improving the fillet-forming ability of brazeable aluminum alloy materials by treating the material, prior to brazing, with an aqueous solution containing from 0.05 to 5% by wt. HF and from 1 to about 20% by wt. HNO 3 whereby the aqueous solution is heated to a temperature in the range from 15° C. to 98° C. for a time period not less than 5 seconds and recovering the treated material.
Claim 3
Dependent Claim
44 words
A method according to claim 1 wherein the concentration of the HF component of the solution is within the range from 0.10 to 0.65% by wt., and the concentration of the HNO 3 component is within the range from 2 to 6% by wt.
Claim 4
Dependent Claim
22 words
A method according to claim 1 wherein the temperature of the solution is kept within the range from 65° to 96° C.
Claim 5
Dependent Claim
22 words
A method according to claim 1 wherein the length of the treatment is within the range from 10 seconds to 60 seconds.
Claim 6
Dependent Claim
16 words
A method according to claim 1 wherein the treated material is aluminum alloy vacuum brazing sheet.
Claim 7
Dependent Claim
19 words
A method according to claim 1 wherein the treated material is a component of an aluminum alloy heat exchanger.
Claim 8
Dependent Claim
15 words
A method according to claim 6, wherein the aluminum alloy heat exchanger is a radiator.
Claim 9
Dependent Claim
20 words
A method according to claim 6 wherein the aluminum alloy heat exchanger component is selected from fins, headers and tubes.
Claim 10
Dependent Claim
26 words
A method according to claim 1 wherein the material is made from an Aluminum Association aluminum alloy of the 1000, 3000, 4000, 5000 or 6000 series.
Claim 11
Dependent Claim
19 words
A method according t claim 9 wherein the alloy is clad with an Aluminum Association 4000 series aluminum alloy.
References Cited (Backward Citations)
US2287111A
Cited
US2711364A
Cited
US3008104A
Cited
US2957239A
Cited
US3497945A
Cited
US3440712A
Cited
US3458353A
Cited
US3597832A
Cited
US3622391A
Cited
US3779839A
Cited
DE3104107A1
Cited
US4586964A
Cited
US4851091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |