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Flux-cored wire for welding of 2Al2 high-strength aluminum alloy gas tungsten arc welding

A technology of flux-cored welding wire and aluminum alloy, applied in the field of aluminum alloy welding, can solve the problems of low joint strength, hot crack, coarse structure, etc., and achieve the effects of low cost, simple operation process, and improved strength

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

AI Technical Summary

Problems solved by technology

[0007] The present invention organically combines the three mechanisms of flux-cored welding wire technology with micro-nano particle enhancement and rare-earth metal purification to improve the structure, and designs and prepares a flux-cored welding wire for welding 2A12 aluminum alloys. The purpose is to solve the problem of existing aluminum alloy solid welding wire When directly welding 2A12 aluminum alloy, problems such as thermal cracks, coarse structure in the heat-affected zone, and low joint strength are prone to occur

Method used

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  • Flux-cored wire for welding of 2Al2 high-strength aluminum alloy gas tungsten arc welding
  • Flux-cored wire for welding of 2Al2 high-strength aluminum alloy gas tungsten arc welding
  • Flux-cored wire for welding of 2Al2 high-strength aluminum alloy gas tungsten arc welding

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Effect test

Embodiment 1

[0045] The aluminum alloy flux-cored wire used for 2A12 high-strength aluminum alloy TIG welding adopts 1070 semi-hard pure aluminum strip sheath 10×1.0mm, the filling rate is 20%, and the diameter of the wire after drawing, reducing, peeling, straightening, and cutting The chemical composition (% by weight) of the drug core is as follows: wherein the metal Cu powder is 23%, the content of the metal Mn powder is 3%, the content of the metal V powder is 2%, and the content of the titanium-aluminum alloy powder is 1.5%. The content of metal Zr powder is 2%; the composite micro-nano ceramic particles are TiC: 8%; the rare metal powder is Sc powder with a content of 1.5%, and the balance is pure aluminum powder. 99.99% pure argon is used as the shielding gas, the gas flow is 17L / min, the welding current is 80A, and the voltage is 18V.

Embodiment 2

[0047] The flux-cored welding wire used for TIG welding of 2A12 high-strength aluminum alloy is made of 1070 pure aluminum strip sheath 10×1.0mm, the filling rate is 22%, and the diameter of the filler wire after drawing, reducing, peeling, straightening and cutting is 1.2mm; The chemical composition (% by weight) of the drug core is metal Cu powder: 24%, metal Mn powder: 3.5%, metal V powder: 1.5%, titanium aluminum alloy powder: 1.5%, metal Zr powder: 2.5%; composite micro-nano ceramics Particles are TiC: 10%, ZrC: 10%; rare metals are Er: 2%; the balance is pure aluminum powder. 99.99% pure argon is used as the shielding gas, the gas flow rate is 18L / min, the welding current is 100A, and the voltage is 20V.

Embodiment 3

[0049] The flux-cored welding wire used for TIG welding of 2A12 high-strength aluminum alloy adopts 1070 pure aluminum strip sheath 12×0.8mm, the filling rate is 24%, and the diameter of the filling wire is 1.4mm after drawing, reducing, peeling, straightening and cutting; The chemical composition (% by weight) of the drug core is metal Cu powder: 25%, metal Mn powder: 2.5%, metal V powder: 2%, titanium aluminum alloy powder: 1.5%, metal Zr powder: 3%; micronano ceramic particles It is TiN: 18%; the rare metal powder is Sc+Zr, among which Sc: 2%, Zr: 4%, and the balance is pure aluminum powder. 99.99% pure argon is used as the shielding gas, the gas flow rate is 15L / min, the welding current is 120A, and the voltage is 21V.

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Abstract

The invention discloses a flux-cored wire for welding of 2Al2 high-strength aluminum alloy tungsten inert gas arc welding, and belongs to the technical field of aluminum alloy welding. The filling rate of the flux-cored wire is 20 % to 30 % with a 1070 semi-hard pure aluminum strip as the outer skin, wherein powder comprises the alloy components in percentage by mass: 22 % to 29 % of Cu powder, 0.5 % to 25 % of micro-nano ceramic powder, 2 % to 4.5 % of Mn powder, 1 % to 2.5 % of V powder, 1 % to 2 % of AlTi alloy powder, 1.5 % to 5 % of Zr powder, 1 % to 6 % of rare earth metal powder, and the balance of pure aluminum powder. The welding is well formed, defects such as bulge and undercut are avoided, and all properties of weld metal meet the engineering requirements.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy welding, and relates to an aluminum alloy flux-cored welding wire and a preparation method thereof, in particular to a flux-cored welding wire reinforced by micronano particles for welding 2A12 high-strength aluminum alloys and a preparation method thereof. [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 in structural components is increasing year by year. 2A12 belongs to the Al-Cu-Mg serie...

Claims

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Application Information

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IPC IPC(8): B23K35/28B23K35/12B23K35/40
CPCB23K35/0266B23K35/286B23K35/40
Inventor 李红田振栗卓新李国栋丛兴祝静
Owner BEIJING UNIV OF TECH
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