Diffusion welding connecting method adopting Cu foil and Ti foil as composite interlayer

A technology of composite intermediate layer and connection method, applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc., can solve the problems of limited research reports, high welding temperature and holding time, damage, etc., and reduce welding specifications. requirements, reducing the tendency to form, the effect of a good connection

Active Publication Date: 2018-12-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

due to Ti 2 AlNb alloy or Ti 3 The solution treatment temperature of Al-based alloys is in the range of 980°C to 1020°C. Such a high welding temperature and holding time in this patent may damage Ti 2 AlNb alloy or Ti 3 The structure and properties of the Al-based alloy base metal, good joint performance can not be obtained at the expense of the performance of the base metal
[0006] The above is about nickel-based superalloys and Ti 2 AlNb alloy or Ti 3 The main research progress of Al-based alloy connection, the research reports on this field at home and abroad are still relatively limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment one, using copper foil and titanium foil as the composite intermediate layer for nickel-based superalloy and Ti 3 Diffusion welding of Al-based alloys, the welding process is as follows:

[0032] Step 1. Using wire cutting to cut nickel-based superalloy and Ti 3 The Al-based alloy is processed into the required size, and the surface to be welded of the base metal to be welded is polished with sandpaper, and then polished to obtain the base metal to be welded;

[0033] Step 2, using HNO with a volume ratio of 1:9 3 、H 2 O solution was used to remove the oxide film on the copper foil with a thickness of 30 μm, and the corrosion time was 30 s. 3 、H 2 O solution was used to remove the oxide film on the titanium foil with a thickness of 40 μm, and the corrosion time was 50 s to obtain the intermediate layer for diffusion welding;

[0034] Step 3, put the processed base metal, copper foil and Ti foil into acetone for ultrasonic cleaning for 10 minutes;

[003...

Embodiment 2

[0038] Embodiment two, use copper foil and titanium foil as composite intermediate layer to Ni-base superalloy and Ti 3 Diffusion welding of Al-based alloys, the welding process is as follows:

[0039] Step 1. Using wire cutting to cut nickel-based superalloy and Ti 3 The Al-based alloy is processed into the required size, and the surface to be welded of the base metal to be welded is polished with sandpaper, and then polished to obtain the base metal to be welded;

[0040] Step 2, using HNO with a volume ratio of 1:9 3 、H 2 O solution was used to remove the oxide film on the copper foil with a thickness of 20 μm, and the corrosion time was 20 s. 3 、H 2 O solution was used to remove the oxide film on the titanium foil with a thickness of 30 μm, and the corrosion time was 30 s to obtain the intermediate layer for diffusion welding;

[0041] Step 3, put the processed base metal, copper foil and Ti foil into acetone for ultrasonic cleaning for 10 minutes;

[0042] Step 4: P...

Embodiment 3

[0044] Embodiment three, using copper foil and titanium foil as the composite intermediate layer for nickel-based superalloy and Ti 2 Diffusion welding of AlNb alloy, the welding process is as follows:

[0045] Step 1. Using wire cutting to cut nickel-based superalloy and Ti 2 The AlNb alloy is processed into the required size, the surface to be welded of the base metal to be welded is polished with sandpaper, and then polished to obtain the base metal to be welded;

[0046] Step 2, using HNO with a volume ratio of 1:9 3 、H 2 O solution was used to remove the oxide film on the copper foil with a thickness of 20 μm, and the corrosion time was 20 s. 3 、H 2 O solution was used to remove the oxide film on the titanium foil with a thickness of 30 μm, and the corrosion time was 30 s to obtain the intermediate layer for diffusion welding;

[0047] Step 3, put the processed base metal, copper foil and Ti foil into acetone for ultrasonic cleaning for 10 minutes;

[0048] Step 4: ...

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Abstract

The invention relates to a method for connecting a nickel-based superalloy with a Ti2AlNb alloy or a Ti3Al-based alloy, in particular to a diffusion welding connecting method adopting Cu foil and Ti foil as a composite interlayer. The diffusion welding connecting method comprises the steps that the nickel-based superalloy and the Ti2AlNb alloy or the Ti3Al-based alloy are processed into the neededsizes, ground and polished; the Cu foil and the Ti foil are subjected to oxidation film removing, and are placed into acetone with a welded base material to be subjected to ultrasonic cleaning; and the Cu foil makes contact with the nickel-based superalloy, the Ti foil makes contact with the Ti2AlNb alloy or the Ti3Al-based alloy, and thus a welded test piece with the structure of the Ti2AlNb alloy or the Ti3Al-based alloy/the Ti foil/ the Cu foil/ the nickel-based superalloy is obtained, a welded workpiece is placed into a vacuum heating furnace, the pressure is applied, and welding is completed after heating, heat preservation and cooling heat circulating. The welding temperature can be lowered, forming of a brittle phase of a joint is controlled, and the property of the joint is improved; and the obtained shearing strength of the joint at the room temperature reaches 240-310 MPa.

Description

technical field [0001] The invention relates to a diffusion welding connection method using Cu foil and Ti foil as a composite intermediate layer, belonging to the field of welding technology. Background technique [0002] Titanium-aluminum intermetallic compound has the advantages of low density, high specific strength, specific stiffness, good oxidation resistance, good creep resistance and fatigue resistance, and is one of the most promising lightweight high-temperature structural materials for aerospace in the future. one. In titanium-aluminum intermetallic compounds, Ti 2 AlNb alloy or Ti 3 Research on Al-based alloys has been paid attention to, and its working temperature can reach 700 °C. Compared with ordinary titanium alloys, Ti 2 AlNb alloy or Ti 3 Al-based alloys can serve at higher temperatures; they have lower densities compared to nickel-based superalloys, about half that of nickel-based superalloys. In the automotive industry, Ti 2 AlNb alloy or Ti 3 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00B23K20/14B23K20/233B23K20/24B23K103/18
CPCB23K20/001B23K20/14B23K20/233B23K20/24
Inventor 任海水熊华平程耀永陈波李文文
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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