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Resistance brazing welding method for titanium aluminum alloy turbine and steel shaft

A resistance brazing, titanium-aluminum alloy technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of low connection strength and complex procedures in the brazing process, and achieve good joint organization and performance uniformity. Easy operation and uniform end face temperature

Inactive Publication Date: 2012-03-21
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a resistance brazing welding method between a titanium-aluminum alloy turbine and a steel shaft, so as to solve the problems of complicated procedures of the current friction welding method and low connection strength of the brazing process; it can realize high connection strength , Welding speed is fast, to meet the needs of mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using TAC-2 titanium-aluminum base alloy turbine, 42CrMo steel shaft, the diameter of the turbine shaft and steel shaft is machined to 16mm, and the end surface roughness reaches Ra3.2 or more; the brazing material is BNi-2, and the thickness of the brazing material is 0.04mm. After the parts are clamped by the vacuum resistance brazing machine, the system is vacuumed to 1×10 -2 Pa, first apply an initial load of 2000N, so that the load pressure reaches 10MPa, pass a current of 4000A, after 2S, the temperature reaches 500°C, increase the current to 7000A, after 4S, the welding seam is about 1050°C, disconnect the power supply after the solder melts, and apply The upsetting pressure is 3000N, continue to maintain the pressure of 3000N, so that the load pressure reaches 15MPa, keep for 5s, and finally anneal at 580°C for 1.5h. The tensile test shows that the tensile strength of the weld is 203MPa.

Embodiment 2

[0025] RNT650 titanium-aluminum-based alloy turbine is used, 40Cr steel shaft is used, and the brazing material is BNi-1, and the thickness of the brazing material is 0.02mm. The diameter of turbine shaft and steel shaft is machined to 14mm, and the end surface roughness reaches Ra3.2 or above. After the parts are clamped by the vacuum resistance brazing machine, the system is vacuumed to 1×10 -2 Pa, first apply an initial load of 1600N, so that the load pressure reaches 8MPa, pass a current of 3200A, after 2S, the temperature reaches 500°C, increase the current to 5600A, after 4S, the welding seam is about 1050°C, disconnect the power after the solder melts, and apply The upsetting pressure is 2400N, so that the load pressure reaches 12MPa, and the pressure of 2400N is maintained for 5s. Finally, it is annealed at 580°C for 1.5h. The tensile test shows that the tensile strength of the weld is 194MPa.

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Abstract

The invention introduces a resistance brazing welding method for a titanium aluminum alloy turbine and a steel shaft. The method is characterized by comprising the following steps of: adding brazing filler metal between an aluminum turbine and the steel shaft; melting the brazing filler metal by utilizing resistance heat; applying upsetting force; unloading components after keeping for a period of time; and performing distressing and annealing on the components to obtain a combined part of the turbine and the steel shaft. In the resistance brazing welding method for the titanium aluminum alloy turbine and the steel shaft, the temperature on the overall surface can be more uniform by a connection method for heating by utilizing resistance heat; joint tissues and performance uniformity are good after welding, so that the weld seam strength is higher than that in common brazing welding and can reach 190 MPa; and simultaneously, the production efficiency is higher and batch production is easier to realize. A weld assembly obtained by adopting the method meets the requirement on use environment of a turbocharger.

Description

technical field [0001] The invention relates to a welding method of a titanium-aluminum intermetallic compound alloy and steel, in particular to a resistance brazing welding method of a titanium-aluminum alloy turbine and a steel shaft. Background technique [0002] Exhaust gas turbocharging is one of the main technologies for increasing the power of modern gasoline engines and diesel engines. The turbocharger rotates at a high speed driven by the exhaust gas of the engine. The turbine speed of a diesel engine is usually (5-20)×10 4 r / min, gasoline engine turbine speed usually can reach (25-26)×10 4 r / min, and the turbine needs to withstand a high temperature working environment of about 700-950°C for a long time. Therefore, higher requirements are put forward for the performance of turbine materials, namely higher strength, oxidation resistance and lighter density, etc. γ-TiAl-based alloy materials have good high-temperature strength, creep resistance and oxidation resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00
Inventor 陈志强包淑娟周洪强王孟光吴胜男刘国良
Owner LUOYANG SUNRUI TI PRECISION CASTING
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