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Metal filler for controlling brittle phases in titanium-aluminum dissimilar metal welded joints and application of metal filler

A technology of metal filling and dissimilar metals, applied in the field of welding fillers, can solve the problems of high cost, lack of brittle phases, and high requirements for operators

Active Publication Date: 2019-12-06
CHANGZHOU VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two measures are costly and have high requirements for operators, which are greatly restricted in industrial production.
Today, manual fusion welding is still dominant in industrial applications, but there is a lack of a suitable process to reduce the generation of brittle phases

Method used

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  • Metal filler for controlling brittle phases in titanium-aluminum dissimilar metal welded joints and application of metal filler
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  • Metal filler for controlling brittle phases in titanium-aluminum dissimilar metal welded joints and application of metal filler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A metal filling material for controlling the brittle phase in the welded joint of titanium-aluminum dissimilar metals in powder form, comprising the following components in mass percentage: 73% of 400-mesh aluminum powder, 10% of 400-mesh silicon powder, 9% of 325-mesh nickel powder, 300 mesh silver powder 8%.

[0049] The application method of the above-mentioned metal filling material comprises the following steps:

[0050] (1) Clean the butt surface of TC4 titanium alloy and 2A14 aluminum alloy plate within 20mm with a wire brush to reveal the metallic luster, and obtain the pretreated titanium alloy plate and aluminum alloy plate; then use an angle grinder to grind the pretreated aluminum alloy plate After forming a groove angle of 45°, use a wire brush and acetone to clean the 20mm range of the weld, and then fix it in the fixture; evenly fill the powdered metal filling material in the pretreated titanium alloy plate and pretreated aluminum alloy plate. In the sin...

Embodiment 2

[0053] A powdery metal filling material for controlling the brittle phase in welded joints of titanium-aluminum dissimilar metals, comprising the following components in mass percentage: 68% of 400-mesh aluminum powder, 12% of 400-mesh silicon powder, 10% of 325-mesh nickel powder, 300 mesh silver powder 10%.

[0054] The application method of the above-mentioned metal filling material is the same as that of Embodiment 1.

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Abstract

The invention provides a metal filler for controlling brittle phases in titanium-aluminum dissimilar metal welded joints and its application and belongs to the technical field of welding fillers. Themetal filler comprises the following components in percentage by mass: 68%-78% of Al, 8%-15% of Si, 8%-18% of Ni and 6%-16% of Ag. Si in the metal filler plays a role in delaying formation of TiAl3 intermetallic compounds. Since the mutual diffusion coefficient of Ni and Ti is higher than that of Al and Ti, added Ni can preferentially diffuse and combine with Ti to interfere with generation of Ti-Al brittle phases; Ag can diffuse into the grain boundary of an Al matrix faster to interfere with and block generation of the Ti-Al brittle phases. The metal filler can adapt to various welding methods and can be applied flexibly. Data of the embodiment shows that the average tensile strength of the welded joints made of the metal filler is higher than 230 MPa.

Description

technical field [0001] The invention relates to the technical field of welding fillers, in particular to a metal filler material for regulating and controlling the brittle phase in welded joints of titanium-aluminum dissimilar metals and its application. Background technique [0002] At present, in high-tech fields such as aerospace and weaponry, aluminum alloys are widely used due to their low density and good economy; One of the new materials that aerospace focuses on. As the design of aero-engines and aircraft structures has higher and higher requirements for "thrust-to-weight ratio", the demand for composite structures of titanium alloys and aluminum alloys is becoming more and more urgent. Titanium / aluminum composite components have excellent properties such as high strength-to-weight ratio, good fatigue resistance, good stability and high anti-vibration limit, and have broad application prospects in aerospace, weaponry, transportation and other fields. However, when ...

Claims

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Application Information

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IPC IPC(8): C22C21/02B23K9/167B23K26/21B23K15/00
CPCB23K9/167B23K15/0046B23K26/21C22C21/02
Inventor 张鑫吕涛李书齐马国新
Owner CHANGZHOU VOCATIONAL INST OF ENG
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