US4078977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface preparation of a damaged braze for rebrazing
Assignee: Individual
•
Filing: 1976-09-13
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Granted: 1978-03-14
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Expires: 1996-09-13
Abstract
Abstract A method of preparing the surface of a damaged braze for rebrazing whereby the brazed article or part is cleaned, including the removal of excess braze, electrolessly pre-plated with a metal which is a constituent of the braze being repaired so as to penetrate into the damaged area of the braze and electrolytically plated with a metal which is a constituent of the braze being repaired, wherein said plating acts as a carrier and wetting agent for the braze to be used in the rebrazing operation.
Inventors
- 👤 Laurence R. Fountain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:03
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; C; C25; C25D; C25D5/00; C25D5/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A method of preparing the surface of a damaged braze of a brazed part for rebrazing, said method comprising cleaning said surface so as to remove excess braze, any oxides thereof and other deposits from said surface, electrolessly pre-plating said surface with a plating metal which is a component of the damaged braze, electrolytically plating said surface with a metal which is a component of the damaged braze and cleaning said surface with a solvent to remove any residue formed on said surface during said plating step.
Claim 2
Independent Claim
87 words
A method of preparing the surface of a damaged braze of a brazed part for rebrazing, said method comprising cleaning said surface so as to remove excess braze, any oxides thereof and other deposits from said surface, electrolessly pre-plating said surface with a plating metal which is a component of the damaged braze, electrolytically plating said surface with a metal which is a component of the damaged braze and cleaning said surface with a solvent to remove any residue formed on said surface during said plating step.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said pre-plating step further includes electrolytically depositing additional layers of a metal which is a component of the damaged braze on said surface.
Claim 4
Dependent Claim
46 words
The method of claim 1 wherein said first cleaning includes treating said surface in an alkaline bath in the presence of a DC current, neutralizing said surface with a weak acid and depassivating said surface with a strong acid in the presence of a DC current.
Claim 5
Dependent Claim
34 words
The method of claim 1 wherein said electroless pre-plating comprises immersing said brazed part in a plating bath for 15 - 45 minutes at a temperature of from about 140° F to 160° F.
Claim 6
Dependent Claim
42 words
The method of claim 1 wherein said electrolytic plating comprises immersing said brazed part in a plating bath for 10 - 30 minutes at a temperature of from about room temperature to about 140° F in the presence of a DC current.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein said solvent used for cleaning residue formed on said surface as a result of said plating step is water.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein said braze comprises an alloy of gold and nickel.
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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |