Friction Welding of Titanium Aluminide Turbine to Titanium Alloy Shaft
First Claim
1. A method for joining a first component fabricated from titanium aluminide to a second component fabricated from a titanium alloy by friction welding, the method comprising:
- preheating the first component;
rotating the second component and pressing the second component against the first component at a first pressure and for a first time period;
after the first time period expires, rotating the second component and pressing the second component against the first component at a second pressure for a second time period;
after the second time period expires, stopping the rotation of the second component and pressing the second component against the first component at a third pressure for a third time period.
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Accused Products
Abstract
A frictional welding process for joining a titanium aluminide turbine to a titanium alloy shaft is disclosed. The disclosed process includes preheating the turbine to a designated temperature, providing a specially-designed joining interface geometry at the distal end of the shaft and optimizing the frictional welding parameters. The frictional welding is carried out in multiple steps but, while the shaft is being spun by a rotating chuck, two different pressures and two different time periods are used until the narrower portions of the distal end of the shaft have been fused onto the welding surface of the turbine. Then, an additional forging step with yet another engagement pressure between the shaft and the turbine is carried out without rotation of the shaft.
13 Citations
20 Claims
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1. A method for joining a first component fabricated from titanium aluminide to a second component fabricated from a titanium alloy by friction welding, the method comprising:
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preheating the first component; rotating the second component and pressing the second component against the first component at a first pressure and for a first time period; after the first time period expires, rotating the second component and pressing the second component against the first component at a second pressure for a second time period; after the second time period expires, stopping the rotation of the second component and pressing the second component against the first component at a third pressure for a third time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of joining a shaft to a turbine of a turbocharger, the method comprising:
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providing a titanium alloy shaft having an end having first diameter and that is connected to a distal end having a second diameter that is smaller than the first diameter; providing an titanium aluminide turbine with a welding surface for receiving the end of the shaft and having a third diameter greater than the second diameter; preheating the turbine; placing the shaft in a rotating chuck and placing the turbine in a stationary chuck that is axially aligned with the rotating chuck and so that the shaft is an axial alignment with the welding surface of the turbine; rotating the shaft and pressing the distal end of the shaft against the welding surface of the turbine at a first engagement pressure; after the distal end of the shaft is been substantially displaced or fused into the welding surface, continuing to rotate the shaft and pressing the end of the shaft against the welding surface of the turbine at a second engagement pressure; stopping rotation of the shaft and continuing to press the end of the shaft against the welding surface of the turbine at a third engagement pressure. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A turbocharger comprising:
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shaft having a first diameter at a first end thereof, the first end of the shaft being connected to a distal end having a second diameter that is smaller than the first diameter; a turbine including a welding surface having a third diameter greater than the second diameter. - View Dependent Claims (17, 18, 19, 20)
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Specification