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Micro-nano particle reinforced aluminum alloy flux-cored filler wire used for TIG welding of 7075 aluminum alloy

A micro-nano particle, aluminum alloy technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problem of inability to change the alloy composition and particle enhancement, achieve good market application value, good welding forming, forming beautiful effect

Inactive Publication Date: 2020-04-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention organically combines the flux-cored welding wire technology and the micro-nano particle reinforcement mechanism, designs and prepares the micro-nano particle-reinforced aluminum alloy flux-cored filler wire for 7075 aluminum alloy welding, and aims to solve the problem of TIG welding solid welding in the existing arc welding technology. The problem that the welding wire cannot change the alloy composition or add particle reinforcement phase

Method used

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  • Micro-nano particle reinforced aluminum alloy flux-cored filler wire used for TIG welding of 7075 aluminum alloy

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Effect test

Embodiment 1

[0029] The micro-nanoparticle-reinforced core filler wire used for 7075 ultra-high-strength aluminum alloy TIG welding adopts 1070 pure aluminum strip sheath 8×0.3mm, the filling rate is 20%, and the diameter of the filler wire after drawing and reducing is 0.8mm; The chemical composition (weight %) of core is metallic Mg powder: 22.5%, metallic manganese powder: 1.0%, metallic chromium powder: 1.0%, titanium-aluminum alloy powder: 0.6%, composite micro-nano ceramic powder is TiC: 0.5%, surplus The amount is pure aluminum powder. 99.99% pure argon is used as the shielding gas, the gas flow rate is 6L / min, and the welding current is 80A.

Embodiment 2

[0031] The micro-nanoparticle-reinforced flux core filler wire used for 7075 ultra-high-strength aluminum alloy TIG welding adopts 1070 pure aluminum strip sheath 8×0.4mm, the filling rate is 22%, and the diameter of the filler wire is 1.0mm after drawing and diameter reduction; The chemical composition (weight %) of core is metallic Mg powder: 23%, metallic manganese powder: 0.95%, metallic chromium powder: 0.25%, titanium-aluminum alloy powder: 0.8%, composite micro-nano ceramic powder is ZrN: 5%, surplus The amount is pure aluminum powder. 99.99% pure argon is used as the shielding gas, the gas flow rate is 7L / min, and the welding current is 110A.

Embodiment 3

[0033] The micro-nanoparticle-reinforced core filler wire used for TIG welding of 7075 ultra-high-strength aluminum alloy adopts 1070 pure aluminum strip sheath 12×0.4mm, the filling rate is 24%, and the diameter of the filler wire after drawing and reducing is 1.6mm; The chemical composition (% by weight) of the core is metal Mg powder: 24%, metal manganese powder: 0.60%, metal chromium powder: 0.30%, titanium aluminum alloy powder: 1.0%, composite micro-nano ceramic powder is TiC: 5%, ZrC : 5%, the balance is pure aluminum powder. 99.99% pure argon is used as the shielding gas, the gas flow rate is 8L / min, and the welding current is 140A.

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Abstract

The invention discloses a micro-nano particle reinforced aluminum alloy flux-cored filler wire used for TIG welding of 7075 aluminum alloy, and belongs to the technical field of aluminum alloy flux-cored welding wire. Pure aluminum tape is used as an outer skin, powder is prepared from the following components in percentage by mass: 22.5-27.5% of metal magnesium powder, 0.25%-1% of metal manganesepowder, 0.25-1% of metal chrome powder, 0.6-2% of titanium aluminum alloy powder, 0.5-25% of composite micro-nano ceramic powder, and the balance of pure aluminum powder; the filling rate of a welding wire is 10% to 35 %; and the ratio of titanium to aluminum in titanium aluminum alloy is 1:1. According to the micro-nano particle reinforced aluminum alloy flux-cored filler wire, the tensile strength of a welded joint is improved, at the same time crack resistance is improved, and porosity sensitivity is reduced. The dosage of specific compositions of micro-nano ceramic particles has a certaineffect on welding performance, while the total dosage of the micro- nano ceramic particles has a greater impact on the performance of the welded joint.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy flux-cored welding wire, and relates to an aluminum alloy flux-cored filler wire and a preparation method thereof, in particular to a micronanoparticle-reinforced aluminum alloy flux-cored filler wire for 7075 aluminum alloy TIG welding and its preparation method. [0002] technical background [0003] Aluminum is the most abundant metal element in the earth's crust. Because of its excellent properties such as low density, high specific strength and low cost, it has been widely used in aerospace, military industry, rail vehicles, pressure vessels and other fields. The density of aluminum is one-third of that of steel, and the use of aluminum to replace steel structural parts can reduce the weight by more than 60%. With the increasing demand for lightweight in the manufacturing industry, the use of aluminum alloy and its structural components is increasing year by year. 7075 aluminum alloy i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/12B23K35/40
CPCB23K35/0266B23K35/286B23K35/40
Inventor 栗卓新丛兴李红李国栋田振祝静
Owner BEIJING UNIV OF TECH
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