US3972466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature welding backup strip
Assignee: 3M Co
•
Filing: 1975-04-15
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Granted: 1976-08-03
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Expires: 1995-04-15
Abstract
Abstract The tendency of molten weld metal to burn through a supported refractory welding backup material is greatly reduced by incorporating a woven carbon fiber cloth between the refractory and the support. A preferred product is a pressure-sensitive adhesive tape construction incorporating the carbon-fiber cloth in the backing; surprisingly, the carbon does not embrittle the weld.
Inventors
- 👤 Roger H. Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:01
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/02; B23K9/035; B23K9/0356
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
In a welding backup tape capable of being wound in roll form convolutely about a core, comprising a narrow, elongate flexible sheet backing having, joined to one face thereof, a layer of refractory material for spanning the joint between two abutted pieces to be welded and being held in position during the welding operation to support the weld material, the improvement which comprises utilizing as at least part of said backing a woven carbon fiber cloth, whereby said tape resists extremely high welding temperature without burning through said backing.
Claim 2
Dependent Claim
89 words
In a welding backup tape capable of being wound in roll form convolutely about a core, comprising a narrow, elongate flexible sheet backing having, joined to one face thereof, a layer of refractory material for spanning the joint between two abutted pieces to be welded and being held in position during the welding operation to support the weld material, the improvement which comprises utilizing as at least part of said backing a woven carbon fiber cloth, whereby said tape resists extremely high welding temperature without burning through said backing.
Claim 3
Dependent Claim
15 words
The tape of claim 1 wherein the layer of refractory material consists essentially of glass.
Claim 4
Dependent Claim
12 words
The tape of claim 2 wherein the glass is in fibrous form.
Claim 5
Dependent Claim
16 words
The tape of claim 2 wherein the glass is in the form of a woven fabric.
Claim 6
Dependent Claim
37 words
The tape of claim 1 wherein the layer of refractory material consists essentially of inorganic particles bonded together with a minor amount of flexible organic binder, said layer being adhered to said one face of the backing.
Claim 7
Dependent Claim
47 words
The tape of claim 5 wherein the backing comprises an adhesively joined laminate of woven glass cloth and woven carbon fiber cloth, the inorganic particles being bonded to the exposed face of the glass cloth; said glass cloth imparting additional strength to facilitate handling of the tape.
Claim 8
Dependent Claim
25 words
The tape of claim 6 wherein the backing includes an additional ply of sheet material is adhered to the back of the carbon fiber cloth.
Claim 9
Dependent Claim
15 words
The tape of claim 7 wherein the additional ply of sheet material is creped paper.
Claim 10
Dependent Claim
53 words
The tape of claim 7 wherein the additional ply of sheet material is aluminum foil, said foil extending laterally beyond both edges of the remainder of said tape and being provided on the extended surfaces, with a tacky and pressure-sensitive tape to facilitate mounting on each of the abutted pieces to be welded.
Claim 11
Dependent Claim
40 words
The tape of claim 1 wherein the surface of said backing which is opposite the surface to which the layer of refractory material is joined, is provided with a layer of adhesive to facilitate attachment to a metal backup bar.
Claim 12
Dependent Claim
58 words
In the method of welding abutted metal workpieces which comprises spanning the joint between the workpieces with a layer of refractory material supported by a metal carrier, the improvement which comprises interposing a carbon fabric between the refractory material and the metal carrier, whereby the carbon fabric prevents contact between the molten weld material and the metal carrier.
Claim 13
Dependent Claim
58 words
In the method of welding abutted metal workpieces which comprises spanning the joint between the workpieces with a layer of refractory material supported by a metal carrier, the improvement which comprises interposing a carbon fabric between the refractory material and the metal carrier, whereby the carbon fabric prevents contact between the molten weld material and the metal carrier.
References Cited (Backward Citations)
US2362505A
Cited
US2820427A
Cited
GB817699A
Cited
US3235323A
Cited
US3365566A
Cited
US3494020A
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 |