Methods for repair of single crystal superalloys by laser welding and products thereof
AssigneeHoneywell International Inc.
InventorsYiping Hu, William F. Hehmann, Murali Madhava
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Abstract
Methods for repair of single crystal superalloys by laser welding and products thereof have been disclosed. The laser welding process may be hand held or automated. Laser types include: CO2, Nd:YAG, diode and fiber lasers. Parameters for operating the laser process are disclosed. Filler materials, which may be either wire or powder superalloys are used to weld at least one portion of a single crystal superalloy substrate.
Claims28
A method for welding single crystal superalloys comprising the steps of:
- using a high power energy source to both preheat and melt a filler comprising modified MCrAlY and to cause melting of at least a portion of a surface of a substrate comprising a single crystal superalloy;
- and
- depositing said filler onto the portion of the surface of the substrate to form a solid clad on the substrate to provide a superalloy weld.
A method for welding single crystal superalloys comprising the steps of:
- providing a substrate to be treated, said substrate comprising a single crystal superalloy;
- providing a filler, said filler comprising a superalloy;
- exposing said filler to a high power energy source to cause preheating and melting of said filler by said high power energy source, the high power energy source being a laser selected from the group consisting of carbon dioxide. Nd:YAG, diode and fiber lasers;
- exposing a portion of a surface of said substrate to said high power energy source to cause partial melting of the portion of the surface of said substrate by said high power energy source;
- and
- depositing said filler onto the portion of the melted surface of said substrate to form a solid clad on said substrate to provide a superalloy weld.
A method for repairing a portion of a surface of a single crystal superalloy substrate comprising the steps of:
- providing a single crystal superalloy substrate having a surface defect;
- providing a superalloy filler;
- exposing said filler to a laser source to cause preheating and melting of said filler by said laser source, the laser source being selected from the group consisting of carbon dioxide, Nd:YAG, diode and fiber lasers;
- exposing a portion of a defective surface of said substrate to said laser source to cause melting of the portion of the defective surface of said substrate by said laser source;
- and
- depositing said filler onto the portion of the defective surface of said substrate to form a solid clad on the portion of the defective surface of said substrate to provide a superalloy repair of said surface defect of said substrate.
A method for coating the surface of a single crystal superalloy substrate comprising the steps of:
- selecting a portion of a surface of a single crystal superalloy substrate to be treated;
- providing a filler comprising modified MCrAlY;
- exposing said filler to a laser source to cause preheating and melting of said filler by said laser source;
- exposing the portion of the surface of said substrate to said laser source to cause melting of the portion of the surface of said substrate by said laser source;
- and
- depositing said filler to form a solid clad onto the portion of the surface of said substrate to provide a single crystal superalloy coating on the surface of said substrate.
Dependencies are inferred from the claim text.