Localized tempering of carburized steel
AssigneeFord Motor Company
InventorsPaul John Bojanowski, Tony Hayden
Life of this patent
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Abstract
A method for joining a carburized steel workpiece to a cast iron workpiece is provided that includes tempering a localized area of the carburized steel workpiece, machining the localized area to reduce carbon content, and welding the carburized steel workpiece to the cast iron workpiece at the localized area. The tempering may be performed by induction heating and results in a hardness profile of the localized area of less than 50 HRC.
Claims20
A method of joining a carburized steel workpiece to a cast iron workpiece comprising:
- tempering a localized area of the carburized steel workpiece;
- machining the localized area to reduce carbon content;
- and
- welding the carburized steel workpiece to the cast iron workpiece at the localized area.
A method of preparing a carburized steel workpiece for subsequent welding comprising tempering a localized area of the carburized steel workpiece to reduce its HRC such that the localized area can be machined with carbide tooling to reduce carbon content below about 0.25% by weight.
A method of joining a carburized steel workpiece to a cast iron workpiece comprising:
- induction tempering a localized area of the carburized steel workpiece such that a hardness profile of the localized area is less than 50 HRC;
- machining the localized area to reduce carbon content below about 0.25% by weight;
- and
- welding the carburized steel workpiece to the cast iron workpiece at the localized area.
Dependencies are inferred from the claim text.