Dissimilar metal transition for superheater or reheater tubes

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 20/02 (2006.01) B23K 35/00 (2006.01) F16L 13/007 (2006.01)

Patent

CA 2661860

A tube joint (16) for joining dissimilar metal sections (12, 14) of a superheater or reheater tube (10) is formed using a hot isostatic press process applied to at least two different metals. A first end of the tube joint (16) is formed from a first metal which has substantially the same chemical composition as a metal used to form one section (12) of the superheater or reheater tube (10), and a second end of the tube joint is formed from a second metal which has substantially the same chemical composition as a metal used to form the other section (14) of the superheater or reheater tube (10). Because the ends of the tube joint (16) are made of substantially the same metal as the respective tube sections (12, 14) to which they attach, the welds (18) may be performed using a standard fusion welding process, such as arc welding, and the need for dissimilar metal welding (DMW) is eliminated.

L'invention concerne un joint de tube (16) permettant de joindre des sections de métal dissemblable (12, 14) d'un tube de réchauffeur ou de surchauffeur (10). Ce joint de tube (16) est formé en utilisant un processus de presse isostatique à température élevée appliqué à au moins deux métaux différents. Une première extrémité du joint de tube (16) est formée à partir d'un premier métal qui présente pratiquement la même composition chimique qu'un métal employé afin de former une section (12) du tube de réchauffeur ou de surchauffeur (10), et une seconde extrémité du joint de tube est formée à partir d'un second métal qui présente pratiquement la même composition chimique qu'un métal employé afin de former l'autre section (14) du tube de réchauffeur of de surchauffeur (10). Etant donné que les extrémités du joint de tube (16) sont faites pratiquement à partir du même métal que les sections de tube respectives (12, 14) auxquelles elles se rattachent, les soudures (18) peuvent être réalisées en utilisant un processus de soudage par fusion standard, tel qu'un soudage à l'arc, et le besoin d'un soudage de métal dissemblable (DMW) est éliminé.

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