Methods for weld purging
AssigneeLinde Aktiengesellschaft
InventorsGlen Graydon, Walter Mark Veldsman
Life of this patent
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Abstract
A method for purging air from a structure to be joined by welding by feeding a liquid cryogen to the structure. The liquid cryogen will enter the structure, warm up and enter the gaseous phase very rapidly. The gaseous cryogen will displace the air that is present in the structure out of the structure and reduce the content of oxygen in the structure to about 10 parts per million when welding can begin.
Claims10
A method for purging air from inside a structure that is capable of entraining air to be welded and prior to commencing welding operations comprising feeding a liquid cryogen selected from the group consisting of argon, helium, nitrogen, and mixtures thereof to the inside of said structure wherein said liquid cryogen will expand to a gaseous state and displace said air from the inside of said structure out of said structure wherein the concentration of oxygen in the inside of said structure where the oxygen is measured is about 10 parts per million after said air is displaced out of said structure.
Dependencies are inferred from the claim text.