Patent US3791860A successfully refreshed from Google Patents.
US3791860A
Expired / Lapsed
US
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Coated aluminum welding electrode and filler rod
Assignee: Alcoa Corp
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Filing: 1971-12-27
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Granted: 1974-02-12
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Expires: 1991-12-27
Abstract
Abstract A method of manufacturing a welding electrode or filler rod by cleaning the surface of an aluminum wire rod and applying to the cleaned surface an aqueous solution of an alkali metal silicate having a concentration of greater than 0.5 percent for a period of greater than 5 seconds at a temperature in excess of 140*F in order to establish a thin, oxidation resistant reacted silicate coating on the aluminum surface. Subsequently rinsing and drying the coated aluminum wire or rod. The reacted silicate coating is provided in such a fashion that it has a thickness such that the outermost 1,000 angstroms of the aluminum surface has about 0.10 to 1.25 percent silicon. An aluminum welding rod or electrode having a thin reacted oxidation barrier coating on the exterior surface thereof. The oxidation barrier coating is such that the outermost 1,000 angstroms of the wire surface contains about 0.10 to 1.25 percent silicon and preferably about 0.50 to 0.80 percent silicon. The oxidation resistant coated surface is characterized by resistance to appreciable crazing and flaking responsive to deformation of the aluminum wire.
Inventors
- 👤 W Zelley
- 👤 L Burrell
- 👤 W Rogerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:14
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; B23K35/36; B23K35/3601; B23K35/3607; B23K35/40; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2951; Y10T428/2955
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
52 words
The method of claim 1 including providing said aqueous solution with a material selected from the group consisting of sodium silicate, potassium silicate and lithium silicate, and establishing said reacted silicate coating of such a thickness that the outermost 1,000 angstroms of said aluminum rod surface has at least 0.10 percent silicon.
Claim 2
Dependent Claim
27 words
The method of claim 2 including applying said aqueous solution to said aluminum rod by immersion of said aluminum rod in said alkali metal silicate aqueous solution.
Claim 3
Dependent Claim
34 words
The method of claim 2 including establishing said oxidation resistant reacted silicate coating of a thickness such that the outermost 1,000 angstroms of said aluminum rod surface has about 0.10 to 1.25 percent silicon.
Claim 4
Dependent Claim
28 words
The method of claim 2 including treating said aluminum rod with an aqueous solution of sodium silicate having an SiO2 to Na2O ratio of about 2:1 to 3.75:1.
Claim 5
Dependent Claim
32 words
The method of claim 4 including applying said aqueous solution to said aluminum rod at a temperature of about 170* to 190*F for a period of about 30 seconds to 2 minutes.
Claim 6
Dependent Claim
50 words
The method of claim 5 including rinsing said cleaned aluminum rod surface with water prior to application of said aqueous solution, and establishing said oxidation resistanT reacted silicate coating of a thickness such that the outermost 1,000 angstroms of said aluminum rod surface has about 0.50 to 0.80 percent silicon.
Claim 7
Dependent Claim
43 words
The method of claim 7 including subsequent to rinsing and drying said reacted silicate coated aluminum rod employing said aluminum rod as a consumable welding electrode in an inert-gas metal-arc welding operation to form a weld characterized by a substantial absence of porosity.
Claim 8
Dependent Claim
42 words
The method of claim 7 including subsequent to rinsing and drying said reacted silicate coated aluminum rod employing said aluminum rod as a filler rod in an inert-gas tungsten-arc welding operation to form a weld characterized by a substantial absence of porosity.
Claim 9
Dependent Claim
50 words
An aluminum welding rod comprising an elongated body of substantially solid cross sectional configuration, a reacted oxidation barrier coating on the exterior surface of said elongated body, and said oxidation barrier coating being such that the outermost 1, 000 angstroms of said coated surface contains at least 0.10 percent silicon.
Claim 10
Dependent Claim
30 words
The welding rod of claim 10 including said reacted oxidation barrier coating being such that the outermost 1,000 angstroms of said coated surface contains about 0.10 to 1.25 percent silicon.
Claim 11
Dependent Claim
93 words
The welding rod of claim 11 including said reacted coating being substantially continuous and of substantially uniform thickness, and said coating being the reaction product of the application of an alkali metal silicate aqueous solution to the outer surface of said aluminum rod in order to establish a reacted coating substantially devoid of alkali metal and having the outermost 1,000 angstroms of the coated rod surface containing about 0.50 to 0.80 percent silicon and said reacted coating is characterized by resistance to appreciable crazing and flaking responsive to deformation of said aluminum rod.
Claim 12
Independent Claim
137 words
A method of manufacturing a welding rod capable of producing welds characterized by a substantial absence of porosity comprising: a. providing an elongated aluminum rod; b. cleaning the surface of said aluminum rod with an alkaline etch treatment; c. rinsing said cleaned aluminum rod surface with water; d. applying to said cleaned and rinsed aluminum surface an aqueous solution of an alkali metal silicate having a concentration greater than 0.5 percent for a period of greater than 5 seconds at a temperature of about 140* to 212*F to establish an oxidation resistant reacted silicate coating on said aluminum rod surface; e. rinsing said silicate coated aluminum rod to remove any excess aqueous alkali metal silicate thereon leaving a thin reacted silicate coating thereon substantially devoid of alkali metal; and f. drying said reacted silicate coated aluminum rod.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |