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Friction welding method of titanium-aluminum alloy turbine and 42CrMo quenched and tempered steel shaft

A titanium-aluminum alloy and friction welding technology, applied in the field of friction welding, can solve the problems of low tensile strength of joints

Inactive Publication Date: 2010-09-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the deficiency of low tensile strength of the joint when connecting the titanium-aluminum alloy turbine rotor and the quenched and tempered steel shaft in the existing method, the present invention provides a friction welding method for the titanium-aluminum alloy turbine and the 42CrMo quenched and tempered steel shaft

Method used

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  • Friction welding method of titanium-aluminum alloy turbine and 42CrMo quenched and tempered steel shaft
  • Friction welding method of titanium-aluminum alloy turbine and 42CrMo quenched and tempered steel shaft
  • Friction welding method of titanium-aluminum alloy turbine and 42CrMo quenched and tempered steel shaft

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Experimental program
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Embodiment 1

[0027] Embodiment 1: refer to figure 1 , figure 2 , the specific steps of the friction welding method of titanium-aluminum alloy turbine and 42CrMo quenched and tempered steel shaft are as follows:

[0028] a. The titanium-aluminum alloy turbine 1 to be welded is subjected to stress-relief heat treatment before welding, the heating temperature is 600°C, and the holding time is 1.5; b. An embedding groove 2 in the shape of a rotating body is processed on one side of the titanium-aluminum alloy turbine 1, and the groove depth is 10mm , the minimum inner diameter is the same as the outer diameter of the quenched and tempered steel shaft; c, grinding the surface of the titanium-aluminum alloy turbine 1 to be welded and the quenched and tempered steel shaft 3 to be welded, and cleaning with acetone; d, the titanium-aluminum alloy turbine 1 to be welded and the quenched and tempered steel shaft 3 are respectively clamped in the movable fixture and the rotary fixture of the rotary ...

Embodiment 2

[0030] Embodiment 2: refer to image 3 , Figure 4 , the specific steps of the friction welding method of titanium-aluminum alloy turbine and 42CrMo quenched and tempered steel shaft are as follows:

[0031] a. The titanium-aluminum alloy turbine 1 to be welded is subjected to stress-relief heat treatment before welding, the heating temperature is 630°C, and the holding time is 2h; b. On the side of the titanium-aluminum alloy turbine 1, an embedding groove 2 in the shape of a rotating body is processed, and the groove depth is 10mm , the minimum inner diameter is equivalent to the outer diameter of the quenched and tempered steel shaft 3; c, select a suitable intermediate material 4, such as a superalloy, and first friction weld the intermediate material 4 and the quenched and tempered steel shaft 3, the friction pressure is 400Mpa, the top pressure is 600Mpa, the friction Shorten the pressure by 3mm, and hold the pressure for 5s; d. Process the excess intermediate material ...

Embodiment 3

[0033] Embodiment 3: refer to image 3 , Figure 4 , the specific steps of the friction welding method of titanium-aluminum alloy turbine and 42CrMo quenched and tempered steel shaft are as follows:

[0034] a. The titanium-aluminum alloy turbine 1 to be welded is subjected to stress-relief heat treatment before welding, the heating temperature is 670°C, and the holding time is 2.5h; b. An embedding groove 2 in the shape of a rotating body is processed on one side of the titanium-aluminum alloy turbine 1, and the depth of the groove is 10mm, the minimum inner diameter is equivalent to the outer diameter of the quenched and tempered steel shaft; c. Select a suitable intermediate material 4, such as titanium alloy, and first perform embedded friction welding between the intermediate material 4 and the titanium-aluminum alloy turbine 1, the friction pressure is 450Mpa, and the top pressure is 700Mpa , the pressure holding time is 5s, under the joint action of friction heat and f...

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Abstract

The invention discloses a friction welding method of a titanium-aluminum alloy turbine and a 42CrMo quenched and tempered steel shaft, which aims to solve the technical problem that when the titanium-aluminum alloy turbine rotor and the quenched and tempered steel shaft are connected by the current method, the tensile strength of a joint is low. The invention has the technical scheme that an embedded groove in a shape of a solid of revolution is processed at one side of the titanium-aluminum alloy turbine; in the welding process, the welding end surface of the turbine shaft has friction with the welding surface of the embedded groove of the titanium-aluminum alloy turbine; and by controlling the friction shortening amount, the casting fins formed at the turbine shaft side are fully filled into the embedded groove. Thus dual effects of metallurgical bonding and mechanical connection of the welding surface are achieved, and the tensile strength of the joint of connecting pieces at room temperature is increased from 390MPa in the background art to 480-537MPa.

Description

technical field [0001] The invention relates to a friction welding method, in particular to a friction welding method of a titanium-aluminum alloy turbine and a 42CrMo quenched and tempered steel shaft. Background technique [0002] Titanium-aluminum intermetallic compounds TiAl-based alloys (hereinafter referred to as titanium-aluminum alloys) have the advantages of low density, high strength, good high-temperature mechanical properties and oxidation resistance, and compared with nickel-based superalloys, the mass can be reduced by 40%. , so it is especially suitable for high-temperature insulation of engines and high-temperature moving parts, such as the manufacture of turbines in exhaust gas turbochargers. [0003] Document 1 "Chinese Patent Application No. 20051001040.6" discloses a high-strength connection method between a TiAl-based alloy turbocharger and a steel shaft, which is a welding method of vacuum brazing. It is mainly to process the external thread on the TiA...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24
Inventor 杜随更傅莉王剑汪志斌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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