Palliative superalloy welding process
AssigneeSiemens Energy, Inc.
InventorsTHADDEUS STRUSINSKI, GERALD J. LYNCH, MATTHEW H. LANG
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Abstract
A method of welding including: applying a flux having at least a majority weight percent boron to a surface of a superalloy base material; forming a weldment on the surface wherein boron is melted onto the surface and is incorporated into a resulting weld pool and heat affected zone, and wherein incipient melted inter-dendritic material resulting from presence of the boron is available to flow into a crack formed during cooling of the weldment; and heat treating the weldment to diffuse a remaining concentration of the boron in the weldment and heat affected zone to a desired value.
Claims19
A method, comprising:
- forming a melt pool on a superalloy substrate;
- incorporating an incipient melt facilitator comprising at least 99 weight percent boron into the melt pool.
A method, comprising:
- covering a surface of a superalloy substrate with a paste comprising at least 99 weight percent boron;
- heating the boron covered surface to form a melt pool comprising the boron;
- controlling heating parameters to cause the boron to induced incipient melting in a heat affected zone surrounding the melt pool;
- and
- controlling the heating parameters to ensure incipiently melted material in the heat affected zone remains in a liquid state during conditions known to cause heating-related cracking in the heat affected zone.
A method, comprising:
- heating a superalloy substrate to form a melt pool;
- incorporating an incipient melt facilitator comprising at least 99 weight percent boron into the melt pool;
- controlling heating parameters to cause boron-induced incipient melting in at least one of the melt pool and a heat affected zone surrounding the melt pool;
- and
- controlling the heating parameters to ensure incipiently melted material remains in a liquid state during conditions known to cause solidification cracking.
Dependencies are inferred from the claim text.