Fitting for use in welding stainless steel pipes with...

F - Mech Eng,Light,Heat,Weapons – 16 – L

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Details

F16L 13/007 (2006.01) B23K 20/16 (2006.01) B23K 28/00 (2006.01) B23K 31/02 (2006.01) F16L 13/02 (2006.01)

Patent

CA 2224586

The proposed fitting for use in welding stainless steel pipes with zirconium alloy pipes is designed as an overlap diffusion welded joint between sleeves (1, 2) made from metals corresponding to the metals of the pipes to be welded. The surrounding sleeve (2) of the fitting is made from stainless steel and the adjoining surfaces of the sleeves are provided along the entire length of the overlap with alternating projections and depressions (5, 6) which engage with one another. The overlap diffusion welded joint has a hard diffusion layer (7) of not more than 5 µm in thickness. The walls of the sleeves in the overlap region vary in thickness, so that the wall thickness of one sleeve decreases as that of the other increases, for example in steps, and the projections and recesses are annular. The fitting is used in nuclear technology and in chemical engineering as a bimetallic insert for use in welding stainless steel pipes with zirconium alloy pipes.

Cette invention concerne un raccord pour la soudure de tubes en acier inoxydable à des tubes en alliages de zirconium, lequel se présente sous forme d'une connexion par chevauchement et à soudure par diffusion reliant deux manchons (1, 2) faits des mêmes métaux que ceux des tubes à souder. Le manchon chevauchant (2) du raccord est fait d'acier inoxydable tandis que les surfaces de contact des manchons possèdent, sur toute la longueur du chevauchement, des protubérances et des renfoncements (5, 6) disposés en alternance et entrant les uns dans les autres. Cette connexion par chevauchement et à soudure par diffusion possède une couche dure de diffusion (7) d'une épaisseur n'excédant pas 5 µm. Dans la zone de chevauchement, les manchons possèdent des parois d'une épaisseur variable, de sorte que l'épaisseur de la paroi d'un manchon diminue tandis que l'autre augmente proportionnellement, par exemple par paliers, les protubérances et les renfoncements étant de forme annulaire. Ce raccord peut être utilisé dans le domaine du nucléaire et dans l'industrie chimique en qualité d'insert bimétallique lors de la soudure de tubes en acier inoxydable à des tubes en alliages de zirconium.

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