B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 9/16 (2006.01)
Patent
CA 2286843
Process and apparatus for arc-welding, in particular palsma-welding, a first sub-part with a second sub-part into a hollow structure defining an internal volume, for example a container, the said first and second sub-parts being made of a metal or a metal alloy, in which: - the said first and second sub-parts are brought into contact with each other so as to form an unwelded hollow structure defining an internal volume; - the internal volume of the said hollow structure is inerted by introducing an inerting gas mixture into the said hollow structure, the said inerting gas mixture comprising from 93% to 99.8% nitrogen and from 0.2% to 7% oxygen and being produced by air permeation by means of one or more membrane modules; and - the said first and second sub-parts are welded together so as to form a welded hollow structure. The process according to the invention may also be applied to the manufacture of metal tubes.
L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Proced Es Geo
Ogilvy Renault
LandOfFree
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