US3751626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance welding of aluminum
Assignee: A C PITTSBURGH
•
Filing: 1971-12-17
•
Granted: 1973-08-07
•
Expires: 1991-12-17
Abstract
Abstract Resistance welding such as spot welding of aluminum sheets and the like is greatly enhanced by the provision of a reacted silicate coating which substantially extends the useful life of welding electrodes by reducing pickup of aluminum on the electrode.
Inventors
- 👤 W Binger
- 👤 W Zelley
- 👤 F Hoch
- 👤 P Dickerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:07
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/226; B23K11/00; B23K11/16; B23K11/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
31 words
The method according to claim 1 wherein said parent members are sheet members at least one surface of which sheet member is provided with a coating substantially all over said surface.
Claim 2
Dependent Claim
14 words
bringing said members into lapped contact resistance welding joining relationship at a joint site,
Claim 3
Dependent Claim
25 words
bringing said members into resistance joining relationship with the silicate coated portion situated so as to contact at least one of the resistance welding electrodes,
Claim 4
Dependent Claim
11 words
bringing said resistance welding electrodes into forced contact with said portion,
Claim 5
Dependent Claim
20 words
bringing resistance welding electrodes into forced contact with at least a portion of said members at said joint site, and
Claim 6
Dependent Claim
16 words
The method according to claim 1 wherein said resistance welding process is a spot welding process.
Claim 7
Dependent Claim
19 words
The method according to claim 1 wherein said silicate coating is from 100 angstroms to 0.00003 inch in thickness.
Claim 8
Dependent Claim
25 words
passing sufficient electric current between said electrodes and through said joint site to locally fuse said sheet members together to provide a resistance welded joint.
Claim 9
Dependent Claim
25 words
passing sufficient electric current between said electrodes and through said joint site to locally fuse said sheet members together to provide a resistance welded joint.
Claim 10
Dependent Claim
29 words
The method according to claim 1 wherein said silicate coating is such that the outer 1,000 angstroms of metal surface has a silicon content of at least 0.7 percent.
Claim 11
Dependent Claim
25 words
The method according to claim 1 wherein said members are sheet members each having substantially its entire surface on both sides coated with said coating.
Claim 12
Dependent Claim
15 words
An improved resistance welding process for joining sheet members of aluminum or aluminum alloys comprising:
Claim 13
Dependent Claim
20 words
The method according to claim 7 wherein said reacted silicate coating is from 100 angstroms to 0.00003 inch in thickness.
Claim 14
Dependent Claim
29 words
The method according to claim 7 wherein said silicate coating is such that the outer 1,000 angstroms of metal surface has a silicon content of at least 0.7 percent.
References Cited (Backward Citations)
US1511194A
Cited
US2977458A
Cited
US3196247A
Cited
US3378668A
Cited
US3391033A
Cited
US3584187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |