Methods and systems for mitigating residual tensile stresses

Details Methods and systems for mitigating residual tensile stresses Methods and systems for mitigating residual tensile stresses

B - Operations, Transporting

23

P

B23P 25/00 (2006.01) B23K 37/00 (2006.01)

Patent

CA 2610476

Residual tensile stresses can be mitigated through methods and systems provided by the present invention. Such a method can include securing a metal member (10) to a substrate and at least partially surrounding a portion of the metal member (10) with a cooling fluid (18). As a result, the cooled portion of the metal member (10) contracts a predetermined amount. Once cooled, the metal member may be fixed, preferably welded, to another metal member in a constrained relationship. As the portion of the metal member is returned to its original temperature, expansion of the metal member acts to mitigate residual tensile stresses in the metal assembly. Tensile stress in restrained members, cambering, and structural deformation can be readily controlled in an assembled structure.

La présente invention concerne des procédés et des systèmes permettant d~atténuer des efforts de traction résiduels. Un tel procédé peut consister à fixer un élément métallique (10) à un substrat et entourer au moins partiellement une partie de l~élément métallique (10) avec un fluide refroidissant (18). Ainsi, la partie refroidie de l~élément métallique (10) contracte une quantité prédéterminée. Une fois refroidi, l~élément métallique peut être fixé, de préférence soudé, à un autre élément métallique de manière contraignante. Lorsque la partie de l~élément métallique retrouve sa température d~origine, l~expansion de l~élément métallique agit de manière à atténuer les efforts de traction résiduels dans l~ensemble métallique. Les efforts de traction dans les éléments de retenue, lors d~un cintrage et d~une déformation structurelle peuvent être facilement contrôlés.

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