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US 10,730,144 B2Granted
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.
Claims13
A method of joining a carburized steel workpiece to a cast iron workpiece comprising:
- tempering a localized area of the carburized steel workpiece, wherein the carburized steel workpiece is a hypoid or spiral bevel ring gear and the cast iron workpiece is a differential case;
- machining the localized area to reduce carbon content after tempering the localized area;
- and
- welding the carburized steel workpiece to the cast iron workpiece at the localized area.
1 more element
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 after induction tempering the localized area;
- and
- welding the carburized steel workpiece to the cast iron workpiece at the localized area.
1 more element
Dependencies are inferred from the claim text.