Vacuum diffusion welding connection method of molybdenum-base high-temperature alloy honeycomb structure

Abstract

The invention provides a vacuum diffusion welding connection method of a molybdenum-base high-temperature alloy honeycomb structure. The method comprises the steps that an electroplating solution is generated; a pure nickel plate serves as an anode material, a molybdenum-base high-temperature alloy part serves as a cathode material, and the electroplating solution is used for conducting electroplating operation in a 50-DEG C constant-temperature water bath tank; the molybdenum-base high-temperature alloy part is assembled; after the molybdenum-base high-temperature alloy part is assembled, themolybdenum-base high-temperature alloy part is put into a vacuum brazing furnace and pressurized to enable the pressure to be equal to the first pressure, and vacuum pumping operation begins until the vacuum degree is smaller than or equal to 1*10<-4>Pa; the vacuum brazing furnace is heated to enable the temperature to be equal to the first temperature, and the molybdenum-base high-temperature alloy part is pressurized to enable the pressure to be equal to the second pressure; when the pressure is kept equal to the second pressure, the vacuum brazing furnace is heated to enable the temperature to be equal to the second temperature; the temperature is kept for a preset period of time; and after temperature keeping operation is finished, heating operation of the vacuum brazing furnace stops, furnace cooling operation is conducted to enable the temperature to be equal to 600 DEG C, the pressure is reduced to 0MPa at the pressure reduction speed of being 1MPa / min, and the molybdenum-basehigh-temperature alloy part is subjected to air cooling operation to enable the temperature to be equal to 20 DEG C. The number of pores, cracks and non-welded defects in welded joints can be effectively reduced, and therefore the qualified welded joints are obtained.

Description

technical field [0001] The invention relates to a welding method, in particular to a vacuum diffusion welding connection method of a molybdenum-based superalloy honeycomb structure. Background technique [0002] Compared with pure molybdenum, the TZM alloy made by adding a small amount of titanium Ti and zirconium Zr to molybdenum Mo has better elastic modulus, lower vapor pressure, strong corrosion resistance and good high temperature mechanical properties for the high temperature performance of aviation parts. Features. [0003] However, in the process of welding a TZM alloy honeycomb structure part, due to structural limitations, there are often unqualified weld quality such as cracks, pores and unwelded defects, which lead to the scrapping of TZM alloy honeycomb structure parts. Contents of the invention [0004] The invention provides a vacuum diffusion welding connection method of a molybdenum-based high-temperature alloy honeycomb structure, which can effectively r...

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Problems solved by technology

[0003] However, in the process of welding a TZM alloy honeycomb structure part, due to structural limitations, there are often unqualified weld quality such as cracks, pores and unwelded defects, which leads to the scrapping of TZM alloy honeycomb structure parts.

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