Patent US4891700A successfully refreshed from Google Patents.
Patent US3794804A successfully refreshed from Google Patents.
US3794804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for underwater arc welding
Assignee: Anna Welding Corp
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Filing: 1972-08-07
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Granted: 1974-02-26
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Expires: 1992-08-07
Abstract
Abstract According to the method of this invention water is kept away from the arc in underwater arc welding by means of a gas under a pressure greater than that of the water and, preferably, the wire feeding unit, welding gun, and electrode wire of the gas shielded, metal arc welding apparatus to be used underwater are enclosed in air-tight and water-tight containers. The containers and conduits are then internally pressurized with a shield gas to prevent the entry of water. The welding gun or at least its nozzle is inserted through a flexible sealed orifice in a small local housing chamber having a second opening. This second opening is placed against the work-piece to be welded. Shielding gas is supplied to the housing chamber at a pressure greater than the surrounding water to force water from the chamber and permit welding to take place in a region free of water.
Inventors
- 👤 E Berghof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:21
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/0061
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
A method of underwater electric arc welding a work-piece in which an underwater electric arc is drawn between an electrode of a welding gun and said work-piece to effect welding on said workpiece and in which water is kept from contact with said arc and the weld area of said work-piece immediately adjacent said arc by: movably introducing at least a portion of said welding gun into a local housing having an aperture therein, positioning said housing aperture against at least a portion of the weld area of said work-piece, purging said local housing of water using a shielding gas under a pressure greater than the pressure of said water, and welding said work-piece through said housing aperture in a region substantially free of water.
Claim 2
Independent Claim
125 words
A method of underwater electric arc welding a work-piece in which an underwater electric arc is drawn between an electrode of a welding gun and said work-piece to effect welding on said workpiece and in which water is kept from contact with said arc and the weld area of said work-piece immediately adjacent said arc by: movably introducing at least a portion of said welding gun into a local housing having an aperture therein, positioning said housing aperture against at least a portion of the weld area of said work-piece, purging said local housing of water using a shielding gas under a pressure greater than the pressure of said water, and welding said work-piece through said housing aperture in a region substantially free of water.
Claim 3
Dependent Claim
46 words
A method according to claim 1 which includes the additional step of positioning a pliable gasket between said aperture and the work-piece thereby to enhance the seal between said work-piece and said housing, and effecting relative movement between said housing and said work-piece during said welding.
Claim 4
Dependent Claim
32 words
A method according to claim 1 wherein said shielding gas forms an annular shield about said electrode, and which includes the additional step of introducing an additional shielding gas into said housing.
Claim 5
Dependent Claim
31 words
A method according to claim 1 which includes the additional step of moving said portable housing and said welding gun along said work-piece during welding in order to complete said weld.
Claim 6
Dependent Claim
36 words
A method according to claim 1 which includes the additional step of directing a burst of shielding gas through A jet at the weld area of the work-piece, thereby to aid in clearing the weld area.
Claim 7
Dependent Claim
46 words
A method according to claim 1 which includes the additional step of adjusting the point of discharge of a vent tube communicating with the interior of said local housing relative to said housing, thereby to adjust the pressure of said shield gas in said local housing.
Claim 8
Dependent Claim
32 words
A method according to claim 1 which includes the additional step of effecting relative movement during welding between each of said housing, said gun, and said work-piece, thereby to weld said work-piece.
Claim 9
Dependent Claim
25 words
A method according to claim 7 wherein the shielding gas is divided into small bubbles to lubricate the movement of said housing across said work-piece.
Claim 10
Dependent Claim
25 words
A method according to claim 7 which includes observing said welding on said work-piece through said housing during said welding, thereby to facilitate proper technique.
Claim 11
Dependent Claim
46 words
A method according to claim 7 which includes the additional step of adjusting the point of discharge of a vent tube communicating with the interior of said local housing relative to said housing, thereby to adjust the pressure of said shield gas in said local housing.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |