Patent US4048459A successfully refreshed from Google Patents.
US4048459A
Expired / Lapsed
US
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Method of and means for making a metalic bond to powdered metal parts
Assignee: Caterpillar Inc
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Filing: 1975-10-17
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Granted: 1977-09-13
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Expires: 1995-10-17
Abstract
Abstract A method of and means for making metallic bonds to powdered metal parts by brazing techniques is disclosed in which the braze material is heated to brazing temperature by a laser beam. Techniques for insuring a reliable bond without excessive absorption of braze material by the powdered metal parts are described.
Inventors
- 👤 Michael Earle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:47
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/005; B23K1/0056
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
The method of making a metallic bond between a powdered metal part and a second part comprising the steps of: a. positioning said powdered metal part in selected close spaced juxtaposition to said second part to provide a given space therebetween; b. introducing brazing metal powder which melts at a lower temperature than said powdered metal part and said second part into said given space between said parts at a given time rate; and c. impinging a beam of coherent electromagnetic energy on said brazing metal powder in said space, said beam being fully received within said space to fully melt said brazing metal powder at said given time rate and of such intensity and for such duration whereby deleterious brazing metal powder absorption by said powdered metal part is substantially minimized.
Claim 2
Independent Claim
132 words
The method of making a metallic bond between a powdered metal part and a second part comprising the steps of: a. positioning said powdered metal part in selected close spaced juxtaposition to said second part to provide a given space therebetween; b. introducing brazing metal powder which melts at a lower temperature than said powdered metal part and said second part into said given space between said parts at a given time rate; and c. impinging a beam of coherent electromagnetic energy on said brazing metal powder in said space, said beam being fully received within said space to fully melt said brazing metal powder at said given time rate and of such intensity and for such duration whereby deleterious brazing metal powder absorption by said powdered metal part is substantially minimized.
Claim 3
Dependent Claim
32 words
The method of claim 1 including the step of carrying out said step of introducing brazing metal powder and said step of impinging a beam of coherent electromagnetic energy thereon substantially simultaneously.
Claim 4
Dependent Claim
74 words
The method of claim 2 including the steps of carrying out said step of introducing brazing metal powder at a first location in said space between said parts, carrying out said step of impinging a beam of electromagnetic energy thereon at a second location in said space between said parts, and continuously moving said parts with respect to said first and second locations in a direction from said first location toward said second location.
Claim 5
Dependent Claim
35 words
The method of claim 1 including the step of carrying out said step of introducing brazing metal powder and said step of impinging a beam of coherent electromagnetic energy thereon in alternate increments of time.
Claim 6
Dependent Claim
52 words
The method of claim 4 including the step of continuing said step of introducing brazing metal powder until said space between said parts is substantially filled and subsequently carrying out said step of impinging a beam of electromagnetic energy thereon until all of said brazing metal powder in said space is melted.
Claim 7
Dependent Claim
49 words
The method of claim 1 wherein said step of impinging a beam of coherent electromagnetic energy on said brazing metal powder includes the step of maintaining a power density of greater than about 200 kilowatts per square inch at the impingement of said beam on said brazing metal powder.
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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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |