Micro-nano particle reinforced aluminum alloy core filler wire for welding 7075 aluminum alloy

A technology of micro-nano particles and aluminum alloy, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem that the alloy composition cannot be changed, such as particle enhancement, and achieve good market application value, good welding shape, and easy operation The effect of simple process

Active Publication Date: 2019-12-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention organically combines the flux-cored welding wire technology and the micronanoparticle reinforcement mechanism, and designs and prepares the micronanoparticle

Method used

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  • Micro-nano particle reinforced aluminum alloy core filler wire for welding 7075 aluminum alloy
  • Micro-nano particle reinforced aluminum alloy core filler wire for welding 7075 aluminum alloy
  • Micro-nano particle reinforced aluminum alloy core filler wire for welding 7075 aluminum alloy

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Effect test

Embodiment 1

[0034] The micro-nano particle reinforced flux core filler wire used for welding 7075 ultra-high strength aluminum alloy adopts 1070 pure aluminum strip sheath 8×0.3mm (the composition is shown in Table 1), and the diameter of the flux core filler wire is 0.8mm; the chemical composition of the flux core Composition (weight %) is metal Mg powder: 15%, metal manganese powder: 0.3%, metal chromium powder: 0.5%, titanium aluminum alloy powder: 1.0%, the filling rate of welding wire is 30%, composite micronano ceramic powder is TiC : 83.2%. 99.99% pure argon is used as the shielding gas, the gas flow rate is 15L / min, the welding current is 120A, and the welding voltage is 20V.

Embodiment 2

[0036] The micro-nanoparticle-reinforced core filler wire used for welding 7075 ultra-high-strength aluminum alloy adopts 1070 pure aluminum strip sheath 8×0.4mm (the composition is shown in Table 1), and the diameter of the core filler wire is 1.0mm; Composition (weight %) is metal Mg powder: 20%, metal manganese powder: 0.5%, metal chromium powder: 0.4%, titanium-aluminum alloy powder: 0.8%, the filling rate of welding wire is 24.5%, composite micronano ceramic powder is TiC : 48.3%, ZrC: 30%. 99.99% pure argon is used as the shielding gas, the gas flow rate is 16L / min, the welding current is 140A, and the welding voltage is 21V.

Embodiment 3

[0038]The micronanoparticle-reinforced flux-core filler wire used for welding 7075 ultra-high-strength aluminum alloy is made of 5052 aluminum alloy with a sheath of 9×0.3mm (the composition is shown in Table 1), and the diameter of the flux-core filler wire is 1.0mm; the chemical composition of the flux core Composition (% by weight) is metal Mg powder: 16%, metal manganese powder: 0.6%, metal chromium powder: 0.6%, titanium aluminum alloy powder: 1.0%, the filling rate of welding wire is 28%, and composite micronano ceramic powder is TiC : 41.8%, TiN: 40%. 99.99% pure argon is used as the shielding gas, the gas flow rate is 16L / min, the MIG welding current is 180A, and the welding voltage is 23V.

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Abstract

The invention discloses a micro-nano particle reinforced aluminum alloy core filler wire for welding a 7075 aluminum alloy, and belongs to the technical field of material processing engineering. A pure aluminum strip or a 5052 aluminum alloy strip is adopted as a coating layer, alloy powder in the core comprises pure magnesium powder, manganese powder, chromium powder, titanium-aluminum alloy powder and the like, and ceramic particles such as TiC, ZrC, TiN, SiC and the like with micro-nano sizes are added into the core. When the aluminum alloy core filler wire is used, the aluminum alloy corefiller wire is placed in a groove or a welding seam, and the aluminum alloy core filler wire is welded by adopting a conventional MIG method. Compared with the prior art that an aluminum alloy solid-core welding wire is independently used for welding, the welding seam strength of the 7075 aluminum alloy can be improved, the strength matching degree of a welding joint is further improved, the sensitivity of hot cracks and air holes is reduced, the operation process is simple, and the welding process performance is excellent.

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 an aluminum alloy flux-cored filler wire reinforced with micro-nano particles for welding 7075 aluminum alloy 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 al...

Claims

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Application Information

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IPC IPC(8): B23K35/02B23K35/38
CPCB23K35/0266B23K35/383
Inventor 栗卓新丛兴李红李国栋田振祝静
Owner BEIJING UNIV OF TECH
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