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US 5,234,148 AGranted
Method of welding and a system therefor
AssigneeBritish Nuclear Fuels plc
InventorsPhilip L. Stone, David H. Hoskyn, Bruce R. Keesing
Life of this patent
Estimating the term…
Abstract
A method of welding in which an inert gaseous shield at a welding zone is provided by a mixture of gases of different densities. The proportions of the individual gases in the mixture are controlled to ensure that the density of the gas mixture is about the same as the density of the surrounding atmospheric air. Cryogenic means may be used to form a condensed gas plug in a pipe or the like to be welded.
Claims14
A system for producing a gas mixture for use in welding and having a density substantially equal to the density of the atmospheric air at a zone,.the system comprising:
- means for mixing at least two inert gases from a supply of the gases, one said gas being lighter than air and the other said gas being heavier than air;
- means for comparing the density of the gas mixture with the density of the atmospheric air about the system, and
- means for varying the proportions of the gases in the gas mixture in response to any imbalance in the densities detected by the comparing means so as to equalise the density of the gas mixture with the density of the said atmospheric air.
Dependencies are inferred from the claim text.