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US 6,333,484 B1Granted
Welding superalloy articles
AssigneeChromalloy Gas Turbine Corporation
InventorsMichael Foster, Kevin Updegrove
Life of this patent
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Abstract
A process is provided for welding a nickel or cobalt based superalloy article to minimize cracking by preheating the entire weld area to a maximum ductility temperature range, maintaining such temperature during welding and solidification of the weld, raising the temperature for stress relief of the superalloy, then cooling at a rate effective to minimize gamma prime precipitation.
Claims12
A process for welding a nickel and/or cobalt based superalloy article comprising:
- preheating an entire weld area and region adjacent to the weld area of the article to a maximum ductility temperature range which is above an aging temperature and below an incipient melting temperature for said superalloy and maintaining such temperature during welding and solidification of a weld;
- raising the temperature of the welded article to a stress relieving temperature;
- and cooling the article to below the gamma prime precipitation hardening range at a rate effective to minimize additional gamma prime precipitation.
Dependencies are inferred from the claim text.