Method and apparatus for relieving tensile residual stress...

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

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F16L 13/04 (2006.01) B23K 31/02 (2006.01) B23K 37/00 (2006.01) F16L 13/02 (2006.01)

Patent

CA 2548877

An method for converting tensile residual stress on an inner surface of a welded part of a pipe to compressive residual stress with use of ice plugs formed by cooling the pipe from the outer surface, comprises the steps of: placing refrigerant containers for forming the ice plugs in the upstream and downstream of a butt-welded part; cooling the outer surface of the pipe to form the ice plugs; and then cooling the outer surface of the pipe with use of at least one refrigerant container for expanding the pipe arranged between the refrigerant containers for forming the ice plugs. When the method is applied to a pipe with a large inside diameter, the method comprises forming the ice plugs at a curved pipe, an elbow or a branch pipe in the upstream and downstream of the butt-welded part.

Procédé de conversion de la contrainte résiduelle de tension sur la surface interne d'une portion de tuyau soudée en une contrainte résiduelle de compression par l'utilisation de bouchons de glace formés grâce au refroidissement de la partie externe du tuyau, et comprenant les étapes suivantes : disposition des contenants frigorigènes de façon à former des bouchons de glace en amont et en aval d'une partie soudée bout à bout; refroidissement de la surface externe du tuyau pour former les bouchons de glace; refroidissement de la surface externe du tuyau par l'utilisation d'au moins un contenant frigorigène pour élargir le tuyau disposé entre les contenants frigorigènes servant à former les bouchons de glace. Lorsque le procédé est utilisé avec un tuyau dont le diamètre intérieur est important, il inclut la formation de bouchons de glace sur un tuyau courbé, un coude ou un branchement en amont ou en aval de la partie soudée bout à bout.

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