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Diffusion-welding connecting method taking Ti foil and titanium-based solder foil as interlayer

A connection method and intermediate layer technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as limited research reports and achieve the effect of optimizing welding parameters

Active Publication Date: 2018-09-04
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the current domestic and foreign research on TiAl alloy and Ti 2 AlNb alloy or Ti 3 Research reports on Al-based alloy dissimilar connections are still very limited

Method used

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  • Diffusion-welding connecting method taking Ti foil and titanium-based solder foil as interlayer

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment adopts Ti foil and titanium-based solder foil as the diffusion welding connection method of the intermediate layer to connect TiAl alloy and Ti 2 AlNb alloy, the steps of the method are:

[0026] Step 1. Using wire cutting to combine TiAl alloy with Ti 2 The AlNb alloy is processed into the required size to obtain the base metal to be welded;

[0027] Step 2: Grinding the surface to be welded of the base material to be welded with sandpaper, and then performing polishing treatment, the polished base material to be welded, Ti foil with a thickness of 10-50 μm and titanium-based solder foil with a thickness of 30-60 μm Ultrasonic cleaning in acetone for 3 to 10 minutes;

[0028] The composition system of the titanium-based solder foil includes Ti-Cu-Ni, Ti-Zr-Cu-Ni, Ti-Zr-Cu-Ni-Co(Fe), Ti-Zr-Fe;

[0029] Step 3, the Ti foil is in contact with the surface to be welded of the TiAl alloy, and the titanium-based solder foil and the Ti 2 AlNb alloy is in co...

Embodiment 2

[0032] The difference between this embodiment and the first embodiment is that the first step is to use wire cutting to separate the TiAl alloy and Ti 3 The Al-based alloy is processed into the required size, and what is described in step 3 is to contact the surface to be welded with the Ti foil and the TiAl alloy, and the titanium-based solder foil and the Ti 3 The surface to be welded of the Al-based alloy is in contact, and the composition is Ti 3 Al-based alloy / titanium-based solder foil / Ti foil / TiAl alloy welded workpiece. Others are the same as in Embodiment 1.

Embodiment 3

[0034] The difference between this embodiment and the first embodiment is that in the third step, the Ti foil with a thickness of 20-30 μm is placed in acetone for ultrasonic cleaning. Others are the same as in Embodiment 1.

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Abstract

The invention discloses a diffusion-welding connecting method taking Ti foil and titanium-based solder foil as an interlayer. The method is characterized by comprising the following steps of: processing a TiAl alloy and a Ti2AlNb alloy or a Ti3Al based alloy into needed dimensions; grinding and polishing welded base metal; putting the welded base metal, the Ti foil and the titanium based solder foil into acetone to ultrasonically clean; enabling the Ti foil to be in contact with the TiAl alloy and enabling the titanium based solder foil to be in contact with the Ti2AlNb alloy or the Ti3Al based alloy, thereby forming a welded workpiece of the Ti2AlNb alloy or the Ti3Al based alloy / titanium based solder foil / Ti foil / TiAl alloy; and putting the welded workpiece into a vacuum heating furnace,applying pressure, and completing welding after heating, preserving the heat, cooling and thermally circulating. The diffusion-welding connecting method can control solder residues in a joint, and inhibits forming trend of a continuous brittle reaction layer in the joint, so that the performances of the joint are improved. The obtained joint has room-temperature tensile strength being 510-600 MPa, and has tensile strength being 480 MPa-510 MPa at a high temperature being 650 DEG C.

Description

technical field [0001] The invention relates to a diffusion welding connection method using Ti foil and titanium-based solder foil as an intermediate layer, belonging to the technical field of welding. 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. Among titanium-aluminum intermetallic compounds, TiAl alloys, Ti 2 AlNb alloy or Ti 3 The research on Al-based alloys has been paid attention to, and the working temperature of TiAl alloys can reach 760°C to 850°C. 2 AlNb alloy or Ti 3 The working temperature of Al-based alloys can reach 700°C. Compared with ordinary titanium alloys, TiAl alloys, Ti 2 AlNb alloy or Ti 3 Al-based alloys can serve at higher temperatures; compared with sup...

Claims

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Application Information

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IPC IPC(8): B23K20/16B23K20/233B23K20/24
CPCB23K20/16B23K20/233B23K20/24
Inventor 任海水熊华平程耀永陈波
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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