Patent US3789184A successfully refreshed from Google Patents.
US3789184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-excluding spot-welding method for making heat-exchange grid
Assignee: Reactor Centrum Nederland
•
Filing: 1971-04-16
•
Granted: 1974-01-29
•
Expires: 1991-04-16
Abstract
Abstract A method for spot welding Zircalloy straps in open air to form a heat-exchange grid for holding a plurality of rod-like elements against lateral displacement. Contiguous areas of the straps are clamped between spot-welding electrodes and immediately thereafter the clamped areas are sprayed with a non-viscous volatile liquid, preferably a pure organic compound free of sulfur, fluorine, chlorine and iodine, such as acetone or ethanol. Heated by the welding current, the liquid volatilizes to expell air, thus preventing weakening of the weld by absorbed nitrogen or oxygen.
Inventors
- 👤 G Piepers
- 👤 L Vons
- 👤 Van Der Linde Aart
- 👤 E Ljbrink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:55
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/30; G21C3/32; G21C3/34; G21C3/356; F; F28; F28F; F28F9/00; F28F9/007; F28F9/013; F28F9/0135; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A method for welding in the open air a spacer grid for holding a plurality of roD-like elements against lateral displacement comprising providing a plurality of Zircaloy straps and welding said straps with spot welds in the normal way to each other in the form of a grid by clamping the straps together under electrode pressure, immediately thereafter spraying the weld points with a thin-flowing, non-viscous volatile liquid which is a pure organic compound free of sulfur, fluorine chlorine and iodine, such as acetone or ethanol, whereby the rapid evaporation of the volatile liquid expelling air from the welding prevents the deleterious effects of nitrogen or oxygen absorption on the spotwelding tightness from occurring.
Claim 2
Independent Claim
114 words
A method for welding in the open air a spacer grid for holding a plurality of roD-like elements against lateral displacement comprising providing a plurality of Zircaloy straps and welding said straps with spot welds in the normal way to each other in the form of a grid by clamping the straps together under electrode pressure, immediately thereafter spraying the weld points with a thin-flowing, non-viscous volatile liquid which is a pure organic compound free of sulfur, fluorine chlorine and iodine, such as acetone or ethanol, whereby the rapid evaporation of the volatile liquid expelling air from the welding prevents the deleterious effects of nitrogen or oxygen absorption on the spotwelding tightness from occurring.
References Cited (Backward Citations)
US1605071A
Cited
US1827210A
Cited
US1770540A
Cited
US2056563A
Cited
US3098928A
Cited
US3176762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |