Method for the restoration of damaged areal components
First Claim
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1. A method for the restoration of damaged blades of gas turbines by build-up welding, comprising:
- melting a material in subsequent layers along a sectional cut at which a damaged blade portion was separated from a reusable blade portion such that the material welds to the reusable blade portion and builds up to desired dimensions;
performing the build-up welding against a generally u-shaped and essentially horizontal welding cavity, the welding cavity having a first longitudinal portion which form-fits a remaining blade surface from the reusable blade portion to accurately position the welding cavity with respect to the reusable blade portion, the welding cavity also having a second longitudinal portion extending from the first longitudinal portion and which includes an upward facing surface having a shape which is substantially a negative of at least one of a suction side surface of varying curvature and a pressure side surface of varying curvature of a blade portion to be restored, and at least one upwardly extending side wall which is substantially a negative of at least one of a varying leading edge and a varying trailing edge, such that upon filling the second longitudinal portion of the welding cavity with the build-up welding, the build-up welding will be substantially in a final desired shape of the blade portion to be restored to minimize required finishing work on the blade portion to be restored, an open upward side of the welding cavity providing access to an entire area to be restored by the build-up welding, as well as providing easy removal of the welding cavity from the blade in a direction generally normal to an axis of the blade after the build-up welding has been performed, the complex three dimensional shape of the restored blade portion prohibiting removal of the welding cavity from the blade in a direction generally parallel to an axis of the blade.
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Accused Products
Abstract
Repair of compressor blades (6) of aircraft engines is performed by build-up welding against an essentially horizontal backing (8) whose surface shape is the exact negative of the respective bottom side of the blade to be repaired. With low rework effort, the blades of blisks can, in the installed state, be repaired or fully restored at any point with high quality upon removal of the damaged portion.
62 Citations
17 Claims
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1. A method for the restoration of damaged blades of gas turbines by build-up welding, comprising:
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melting a material in subsequent layers along a sectional cut at which a damaged blade portion was separated from a reusable blade portion such that the material welds to the reusable blade portion and builds up to desired dimensions; performing the build-up welding against a generally u-shaped and essentially horizontal welding cavity, the welding cavity having a first longitudinal portion which form-fits a remaining blade surface from the reusable blade portion to accurately position the welding cavity with respect to the reusable blade portion, the welding cavity also having a second longitudinal portion extending from the first longitudinal portion and which includes an upward facing surface having a shape which is substantially a negative of at least one of a suction side surface of varying curvature and a pressure side surface of varying curvature of a blade portion to be restored, and at least one upwardly extending side wall which is substantially a negative of at least one of a varying leading edge and a varying trailing edge, such that upon filling the second longitudinal portion of the welding cavity with the build-up welding, the build-up welding will be substantially in a final desired shape of the blade portion to be restored to minimize required finishing work on the blade portion to be restored, an open upward side of the welding cavity providing access to an entire area to be restored by the build-up welding, as well as providing easy removal of the welding cavity from the blade in a direction generally normal to an axis of the blade after the build-up welding has been performed, the complex three dimensional shape of the restored blade portion prohibiting removal of the welding cavity from the blade in a direction generally parallel to an axis of the blade. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for the restoration of a damaged three dimensional component of a gas turbine by build-up welding, comprising:
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melting a material in subsequent layers along a sectional cut at which a damaged component portion was separated from a reusable component portion such that the material welds to the reusable component portion and builds up to desired dimensions; performing the build-up welding against a generally u-shaped and essentially horizontal welding cavity, the welding cavity having a first longitudinal portion which form-fits a remaining component surface from the reusable component portion to accurately position the welding cavity with respect to the reusable component portion, the welding cavity also having a second longitudinal portion extending from the first longitudinal portion and which includes an upward facing surface having a shape which is substantially a negative of a side surface of varying curvature of a component portion to be restored, and at least one upwardly extending side wall which is substantially a negative of a varying edge, such that upon filling the second longitudinal portion of the welding cavity with the build-up welding, the build-up welding will be substantially in a final desired shape of the component portion to be restored to minimize required finishing work on the component portion to be restored, an open upward side of the welding cavity providing access to an entire area to be restored by the build-up welding, as well as providing easy removal of the welding cavity from the component portion in a direction generally normal to an axis of the component after the build-up welding has been performed, the complex three dimensional shape of the restored component portion prohibiting removal of the welding cavity from the component in a direction generally parallel to an axis of the component.
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Specification