Imparting deep compressive residual stresses into a gas...

F - Mech Eng,Light,Heat,Weapons – 01 – D

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F01D 5/00 (2006.01) B23P 6/00 (2006.01) C21D 10/00 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2728217

A gas turbine engine airfoil (34) is repaired by machining away airfoil material (50) along at least a portion of at least one of leading (LE) and trailing edges (TE) and a radially outer tip (38) forming at least one cut-back (80) area and forming a weldment by welding successive beads (70) of welding material (72) into the cut -back area (80). Desired finished dimensions of the repaired airfoil are obtained by machining away some of the weld bead material in the weldment and then deep compressive residual stresses are imparted in a pre-stressed region (56) extending into and encompassing the weldment (82) and a portion (26) of the airfoil adjacent the weldment (82). The compressive residual stresses may be imparted after either rough machining or final finishing thereafter of the weldment (82). The cut -back area (80) may extend up to about 90% of the airfoil's span (5) and have a maximum cut-back depth (L) up to about.22 inches.

L'invention concerne la réparation dun aubage de moteur à turbine à gaz en enlevant par usinage du matériau de laubage le long dau moins une partie des bords dattaque et / ou de fuite et dun bout radial extérieur de façon à former au moins une zone échancrée et en formant un ensemble soudé par soudage de cordons successifs de matériau dapport dans la zone échancrée. On obtient des cotes finies souhaitées de laubage réparé en enlevant par usinage une partie matériau dapport des cordons de lensemble soudé, puis des contraintes résiduelles profondes de compression sont créées dans une région précontrainte sétendant jusquà lensemble soudé et lenglobant, ainsi que dans une partie de laubage adjacente à lensemble soudé. Les contraintes résiduelles de compression peuvent être créées soit après lusinage débauche, soit après la finition subséquente de lensemble soudé. La zone échancrée peut sétendre jusquà environ 90% de lenvergure de laubage et présenter une profondeur maximale déchancrure atteignant environ 0,22 pouce.

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