US 7,543,733 B2
Method of protecting against corrosion at high temperature
Sophie Wastiaux, Aulnay Sous Bois (France); and Michel Poteau, Dammartin En Goele (France)
Assigned to L'Air Liquide, Societe Anonyme A Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude, Paris (France)
Filed on Jun. 25, 2003, as Appl. No. 10/603,530.
Claims priority of application No. 03 03238 (FR), filed on Mar. 17, 2003.
Prior Publication US 2005/0173495 A1, Aug. 11, 2005
Int. Cl. B21D 39/04 (2006.01); B23K 1/00 (2006.01)
U.S. Cl. 228—128  [228/126; 228/127; 228/131; 228/182; 228/183; 228/184; 228/189; 285/55; 285/288.1; 285/288.6] 7 Claims
OG exemplary drawing
 
1. A method for protecting a tubular junction, comprising:
providing a first tubular and a second tubular, each tubular having an outer surface and an interior surface for the passage of fluid;
placing a protective surface finish on an interior of the tubulars;
providing a joining tubular having a surface finish on an interior thereof;
connecting the joining tubular between the first and second tubulars to create a junction, the junction only including the joining tubular and an end of each of the first and second tubulars and having a continuous surface finish on an interior surface thereof; and
welding the joining tubular to the first and second tubulars in a manner whereby the continuous surface finish remains on the interior surface of the junction along a non-welded portion between the joining tubular and the end of each of the first and second tubulars.