Vacuum diffusion welding connection method for molybdenum-based superalloy

A technology of vacuum diffusion welding and high temperature alloys, applied in welding equipment, welding equipment, non-electric welding equipment, etc., can solve the problems of unqualified weld quality, cracks and pores, etc., to increase the holding time, control welding cracks, and reduce roughness. The effect of grain generation

Active Publication Date: 2020-08-11
HARBIN DONGAN ENGINE GRP
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Problems solved by technology

[0003] However, defects such as cracks and pores often appear in the process of welding molybdenum-based superalloys, resulting in unqualified weld quality

Method used

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  • Vacuum diffusion welding connection method for molybdenum-based superalloy

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Embodiment approach

[0035] Its specific implementation is as follows:

[0036] 1. Use 800 mesh sandpaper for mechanical polishing to remove surface oxides;

[0037] 2. Ultrasonic cleaning of parts to be welded to remove oil and other dirt on the surface to be welded;

[0038] 3. Put the 50um Ni foil into the parts to be welded, and the gap between the welds after assembly is (0.005-0.01)mm;

[0039] 4. Put the parts into the vacuum brazing furnace, pressurize to 2MPa and start vacuuming until the vacuum degree is ≤1×10 -4 Pa;

[0040] 5. After reaching the degree of vacuum, heat to 900°C at a heating rate of 25°C / min. After reaching 900°C, increase the pressure to 5MPa at a pressurization rate of 0.3MPa / min, and maintain 900°C during the process;

[0041] 6. Pressurize to 5MPa, heat to 1100°C at a heating rate of 10°C / min, keep the temperature for 30min, and maintain a pressure of 5MPa during the process;

[0042] 7. Stop heating after the heat preservation is over, cool down to 600°C with th...

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Abstract

The invention provides a vacuum diffusion welding connection method for molybdenum-based superalloy. The method comprises the following steps: putting Ni foil into to-be-welded positions of parts, andassembling the parts; putting the assembled parts into a vacuum brazing furnace, and pressurizing the parts to first pressure to start vacuumizing until the vacuum degree is lower than or equal to 1* 10 <-4> Pa; heating the vacuum brazing furnace to a first temperature and pressurizing the parts to second pressure; heating the vacuum brazing furnace to a second temperature while maintaining thesecond pressure; performing heat insulation for preset time; stopping heating the vacuum brazing furnace after heat insulation, performing furnace cooling to 600 DEG C, reducing pressure to 0 MPa at the rate of 1 MPa / min, and performing air cooling on the parts to 20 DEG C. The defects of air holes and cracks in welding seams can be effectively reduced.

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. Background technique [0002] In order to meet the needs of high-temperature performance of aviation components, the molybdenum-based superalloy made by adding a small amount of Ti and Zr to molybdenum has better elastic modulus, lower vapor pressure, strong corrosion resistance and good high-temperature mechanical properties than pure molybdenum. features. [0003] However, defects such as cracks and pores often appear in the process of welding molybdenum-based superalloys, resulting in unqualified weld quality. Contents of the invention [0004] The invention provides a vacuum diffusion welding connection method for a molybdenum-based superalloy, which can effectively reduce pores and crack defects in weld seams. [0005] The invention provides a vacuum diffusion welding connection method for a molybdenum-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00B23K20/14B23K20/24B23K1/008B23K1/20
CPCB23K20/001B23K20/14B23K20/24B23K1/008B23K1/20
Inventor 张伟杰郑欣朱永胜陈玉宝李洪宇高明李梓豪
Owner HARBIN DONGAN ENGINE GRP
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