System of components having wire weld joint and a method of joining a system of components including a cast iron component
US-2018142771-A1 · May 24, 2018 · US
Localized tempering of carburized steel
US10730144B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10730144-B2 |
| Application number | US-201715657881-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 24, 2017 |
| Priority date | Jul 24, 2017 |
| Publication date | Aug 4, 2020 |
| Grant date | Aug 4, 2020 |
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is: 1. 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. 2. The method according to claim 1 , wherein the tempering results in a hardness profile of the localized area of less than 50 HRC. 3. The method according to claim 1 , wherein the machining is performed using carbide tooling. 4. The method according to claim 1 , wherein the carbon content is reduced below about 0.25% by weight. 5. The method according to claim 1 , wherein the tempering is performed by induction heating. 6. The method according to claim 5 , wherein the induction heating comprises heating coils configured to match a profile of the localized area. 7. The method according to claim 1 , wherein the tempering is between about 600° F. and about 1,200° F. 8. The method according to claim 1 , wherein the carbon content is reduced without a carbon blocking paste or an alloy cap. 9. The method according to claim 1 , wherein the welding is laser welding. 10. 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. 11. The method according to claim 10 , wherein the induction heating comprises heating coils configured to match a profile of the localized area. 12. The method according to claim 11 , wherein the carburized steel workpiece is rotated within the heating coils. 13. The method according to claim 10 , wherein the tempering is between about 600° F. and about 1,200° F.
Assignees
Inventors
Classifications
characterised by features of the rotating cases · CPC title
Treating localised areas of an article · CPC title
the metal pieces being rotated while induction heated · CPC title
Process efficiency · CPC title
Steel {or steel} alloys · CPC title
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- What does patent US10730144B2 cover?
- 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 …
- Who is the assignee on this patent?
- Ford Motor Co
- What technology area does this patent fall under?
- Primary CPC classification B23K26/323. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Aug 04 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).