US4093474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing aluminum alloys possessing improved resistance weldability
Assignee: Rio Tinto Switzerland AG
•
Filing: 1977-02-07
•
Granted: 1978-06-06
•
Expires: 1997-02-07
Abstract
Abstract Aluminum alloys exhibiting improved resistance weldability are prepared which comprise 2.0-6.0% magnesium, up to 0.40% iron, up to 0.40% silicon, and from 0.03-0.20% vanadium, balance essentially aluminum. The alloys of the present invention are particularly suited for automotive metal working applications.
Inventors
- 👤 Philip R. Sperry
- 👤 William C. Setzer
- 👤 Lloyd E. Damon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:55
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A method for the preparation of wrought products which comprises: A. providing an aluminum base alloy consisting essentially of from about 2.0 to about 6.0% magnesium, up to 0.40% iron, up to 0.40% silicon, and from about 0.03 to 0.20% vanadium, balance aluminum; (B) casting said alloy; (C) heating said alloy to a homogenizing temperature and thereafter homogenizing said alloy; (D) hot and cold working said alloy; (E) annealing said alloy whereby the vanadium is substantially retained in solid solution to provide a wrought produce exhibiting reduced electrical conductivity, increased electrical resistivity, improved resistance weldability plus good tensile properties, said wrought product being capable of plastic deformation; and (F) resistance welding said wrought product to provide a resistance welded article.
Claim 2
Independent Claim
120 words
A method for the preparation of wrought products which comprises: A. providing an aluminum base alloy consisting essentially of from about 2.0 to about 6.0% magnesium, up to 0.40% iron, up to 0.40% silicon, and from about 0.03 to 0.20% vanadium, balance aluminum; (B) casting said alloy; (C) heating said alloy to a homogenizing temperature and thereafter homogenizing said alloy; (D) hot and cold working said alloy; (E) annealing said alloy whereby the vanadium is substantially retained in solid solution to provide a wrought produce exhibiting reduced electrical conductivity, increased electrical resistivity, improved resistance weldability plus good tensile properties, said wrought product being capable of plastic deformation; and (F) resistance welding said wrought product to provide a resistance welded article.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein said alloy comprises from about 2.0 to 5.0% magnesium, from about 0.05 to 0.40% iron, from about 0.05 to 0.40% silicon, and from about 0.3 to 0.20% vanadium.
Claim 4
Dependent Claim
15 words
The method of claim 1 where said alloy is cast by the DC casting method.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein said hot working is commenced at a temperature of about 850° F.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said alloy is not and cold worked by rolling.
Claim 7
Dependent Claim
43 words
The method of claim 1 wherein the heating of Step C is conducted at a rate of 50° F per hour to a homogenizing temperature of about 1025° F, and said alloy is then held at said homogenizing temperature for about 12 hours.
Claim 8
Dependent Claim
36 words
The method of claim 1 wherein said alloy is annealed by heating at a rate of 50° F per hour from 300° to 650° F, and is then held at 650° F for about 2 hours.
References Cited (Backward Citations)
US1305166A
Cited
US1932843A
Cited
US1910861A
Cited
US3232796A
Cited
US3366476A
Cited
US3642542A
Cited
US3938991A
Cited
US3935007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |