Weld repair of superalloy castings
AssigneeHowmet Corporation
InventorJames B. Lulofs
Life of this patent
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Abstract
A method of repairing a void on a nickel or cobalt base superalloy investment casting by vibrating the casting for a time before repairing the void, vibrating the casting while filling the void wherein the void is filled by repeatedly making incremental weld deposits of a superalloy filler material in the void using pulsed gas tungsten arc welding, and impinging each incremental deposit with a cooling gas after each incremental weld deposit is made and before the next incremental weld deposit is made, and vibrating the casting for a time after the void is filled.
Claims22
A method of repairing a void on a superalloy casting, comprising:
- vibrating said casting for a time before filling said void with a filler material,
- vibrating said casting while filling said void by repeatedly making incremental weld deposits of said filler material in said void, and impinging each incremental deposit with a cooling gas after each incremental weld deposit is made and before the next incremental weld deposit is made, and
- vibrating said casting for a time after said void is filled.
A method of repairing a void on a nickel or cobalt superalloy investment casting, comprising:
- solution heat treating said casting,
- clamping said casting on a welding table,
- vibrating said table at a sub-harmonic frequency for a time before filling said void with a superalloy filler material,
- vibrating said table at a sub-harmonic frequency while filling said void by repeatedly making incremental weld deposits of said superalloy filler material in said void using pulsed gas tungsten arc welding and impinging each incremental deposit with a cooling gas after each incremental weld deposit is made and before the next incremental weld deposit is made, and
- vibrating said table at a sub-harmonic frequency for a time after said void is filled.
A method of welding a member comprising a nickel or cobalt base superalloy, comprising:
- vibrating said member for a time before welding,
- vibrating said member while welding said member using arc welding to make incremental weld deposits of a superalloy filler material on said member and impinging each incremental deposit with a cooling gas after each incremental weld deposit is made and before the next incremental weld deposit is made, and
- vibrating said member for a time after said welding.
Dependencies are inferred from the claim text.