Patent US3972111A successfully refreshed from Google Patents.
US3972111A
Expired / Lapsed
US
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Surface preparation method
Assignee: McDonnell Douglas Corp
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Filing: 1975-03-13
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Granted: 1976-08-03
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Expires: 1995-03-13
Abstract
Abstract A method of preparing surfaces of metallic components which are to be adhesive bonded and spot welded is described. The faying surfaces are first prepared for adhesive metal bonding using the most modern effective solutions available for highest strength and corrosion resistance. A primer may be applied upon the faying surfaces for improved corrosion resistance. The surfaces are then abraded in selected areas for spot welding. After spot welding, a bonding adhesive is introduced along one edge of the joint and capillary action assisted by a vacuum draws the adhesive over the entire area of the joint. Alternately, after abrading the selected areas, the adhesive is applied to the faying surfaces, and the spot welding is then accomplished at the abraded areas.
Inventors
- 👤 Edward Dash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:36
CPC Classifications
C; C09; C09J; C09J5/00; C09J5/02; B; B23; B23K; B23K11/00; B23K11/16; B23K11/163; C09J2400/00; C09J2400/10; C09J2400/16; C09J2400/166; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49885; Y10T29/49888
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
A method of preparing faying metal surfaces for adhesive-spot-welding comprising metal bond etching said surfaces, abrading portions of the metal bond etched surfaces to subsequently accept a spot weld within each of said abraded portions, spot welding said abraded portions, and introducing an adhesive to cover all unabraded faying surfaces.
Claim 2
Independent Claim
50 words
A method of preparing faying metal surfaces for adhesive-spot-welding comprising metal bond etching said surfaces, abrading portions of the metal bond etched surfaces to subsequently accept a spot weld within each of said abraded portions, spot welding said abraded portions, and introducing an adhesive to cover all unabraded faying surfaces.
Claim 3
Dependent Claim
28 words
A method of preparing faying surfaces for adhesive-spot-welding as in claim 1 wherein said etching is done with a sulphuric acid-sodium dichromate solution with copper and aluminum added.
Claim 4
Dependent Claim
34 words
A method of preparing faying surfaces for adhesive-spot-welding as in claim 1 wherein, after etching, the surfaces to be welded are masked and the exposed surfaces sprayed with a primer solution for corrosion resistance.
Claim 5
Dependent Claim
32 words
A method of preparing faying surfaces for adhesive-spot-welding as in claim 3 wherein the masking is removed and the surfaces unmasked and unprimed are abraded with a power driven rotary wire brush.
Claim 6
Dependent Claim
23 words
A method of preparing faying surfaces for adhesive-spot-welding as in claim 1 wherein resistance spot welding is done before the adhesive is introduced.
Claim 7
Dependent Claim
44 words
A method of preparing faying surfaces as in claim 5 wherein the adhesive is applied along one edge of said faying surfaces and a vacuum is drawn along the other to draw said adhesive between said faying surfaces to cover unwelded faying surface areas.
Claim 8
Dependent Claim
28 words
A method of preparing faying surfaces for adhesive-spot-welding as in claim 1 wherein said surfaces prepared by metal bond etching are then sprayed with a primer before abrading.
References Cited (Backward Citations)
CA559310A
Cited
US1184750A
Cited
US1712531A
Cited
US2361860A
Cited
US2366244A
Cited
GB570033A
Cited
CH272012A
Cited
US2945778A
Cited
US3283401A
Cited
US3367799A
Cited
US3416975A
Cited
US3337711A
Cited
US3291957A
Cited
US3382547A
Cited
US3455775A
Cited
US3838495A
Cited
US3728763A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |