Method for improving residual stress of structure member

Details Method for improving residual stress of structure member Method for improving residual stress of structure member

C - Chemistry, Metallurgy

21

D

C21D 7/12 (2006.01) B21C 37/08 (2006.01) B21D 31/00 (2006.01) B23K 31/02 (2006.01) C22F 1/10 (2006.01) F25C 1/12 (2006.01) F16L 55/103 (2006.01)

Patent

CA 2638730

A coolant vessel is disposed around a small-diameter pipe filled with water and a heat insulation member is wrapped around the welded portion at a center portion in an axial direction of the pipe in the coolant vessel. Since the cooling rate of the water in the pipe is reduced at the center portion where the heat insulation member is wrapped, the water in the center portion of ice plug freezes last, thereby the ice plug is completely formed. Accordingly, resistance of an ice plug to pressure is improved and thereby the size of the coolant vessel is reduced and residual stress of a small-diameter pipe for which a sufficient difference in temperature cannot obtain between the inner surface and the outer surface of the pipe due to its thin thickness, is improved in compression residual stress.

Une cuve de refroidissement est placée autour d'un tuyau de petit diamètre rempli d'eau. Un élément d'isolation thermique enveloppe la partie soudée à une partie centrale, dans le sens de l'axe du tuyau, dans la cuve de refroidissement. Étant donné que la vitesse de refroidissement de l'eau dans le tuyau diminue à la partie centrale où l'élément d'isolation thermique est enveloppé, l'eau dans la partie centrale du bouchon de glace gèle en dernier, et de ce fait, le bouchon de glace se forme complètement. Par conséquent, la résistance d'un bouchon de glace à la pression est améliorée. Ainsi, la taille de la cuve de refroidissement est moindre et la contrainte propre d'un tuyau de petit diamètre pour lequel une différence de température suffisante ne peut pas être obtenue entre la surface intérieure et la surface extérieure du tuyau en raison de sa faible épaisseur, est améliorée, en ce qui concerne la contrainte propre de compression.

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