| 摘要 |
<p>A method for purging air from a structure (10) to be joined by welding by feeding a liquid cryogen to the structure. The liquid cryogen (15) 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.</p> |
