Corrosion resistant welding of stainless steel
AssigneeL'Air Liquide
InventorsA. Nimal Liyanage, Henri Chevrel, Alain Boireau, Jean-Marie Friedt
Life of this patent
Estimating the term…
Abstract
A process for welding stainless steel tubing in the presence of an inert gas comprising a silicon base gas, in particular silane SiH.sub.4. During the welding operation, a suitable quantity of silicon is deposited by chemical vapor deposition at the weld joint to significantly improve the corrosion resistance of the weld.
Claims16
A process of welding stainless steel under a gaseous atmosphere comprising a silicon containing gas or gas mixture, the process comprising forming a coating comprising silicon in an area at and substantially surrounding the weld by using said gaseous atmosphere during welding in the region where welding occurs.
A process for welding stainless steel tubing comprising shielding the weld region with inert gas selected from the group consisting of Ar, He, H.sub.2, N.sub.2 a mixture of Ar and He, a mixture of He and H.sub.2 and mixtures thereof, said inert gas being caused to purge the weld region prior to commencing the welding process, and forming a coating comprising silicon by introducing and maintaining during the welding operation a silicon containing gas or gas mixture in the region at and surrounding the weld.
Dependencies are inferred from the claim text.