Flux cored wire for particle reinforced aluminum-based composite material fusion welding

A particle-reinforced aluminum and flux-cored welding wire technology, applied in the direction of welding/cutting media/materials, welding media, welding equipment, etc., can solve the problems of low strength of welded joints, unfavorable in-situ reaction of the molten pool, weakening of the strengthening phase, etc., to achieve The effect of improving mechanical properties

Inactive Publication Date: 2011-01-12
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ① The wettability between the reinforcement phase and the matrix is ​​poor. When filling elements are not used to improve the wettability between them, under the action of strong arc heat, Al is pushed from the center of the molten pool to the edge under the action of the arc force, which is not easy A stable weld pool is formed, and the performance of the welded joint decreases
② When welding composite materials with high volume fraction reinforced particles, due to the poor fluidity of the molten pool, segregation and pores are easy to form at the weld, which affects the mechanical properties of the welded joint
③The matrix Al in the composite material is a very active chemical element, and it is easy to react with the reinforcing material under high temperature conditions, forming needle-like brittle compounds at the interface, such as SiC p /Al will generate Al 4 C 3 , distributed at the SiC interface, which greatly weakens the effect of the reinforcing phase and reduces the strength of the joint near the seam
④ During the melting and crystallization process, due to the supercooling of the molten pool during solidification, the reinforcing phase (such as SiC or Al

Method used

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  • Flux cored wire for particle reinforced aluminum-based composite material fusion welding
  • Flux cored wire for particle reinforced aluminum-based composite material fusion welding
  • Flux cored wire for particle reinforced aluminum-based composite material fusion welding

Examples

Experimental program
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Effect test

Example Embodiment

[0044] Example 1

[0045] The applied flux cored wire diameter is The welding wire powder accounts for 20% of the total mass of the flux cored wire, the flux core powder is 40Ti-20Ni-Al, and the aluminum skin of the wire is 7Si-Al, and the SiCp / 6061 composite material is welded. Before welding, put the flux-cored wire into a vacuum oven, keep it warm at 200°C for three hours, take it out of the oven after the wire is cooled, and use 180 # The base metal and flux-cored wire are sanded to remove the oxide film, and then cleaned with acetone. After drying the sample at 150°C, use Ar+25%N 2 As ion gas, the ion gas flow rate is 3L / min, with Ar as the shielding gas, the shielding gas flow rate is 9L / min, the welding current is 80A, the welding speed is 60mm / min, and the flux cored wire adding speed is 40mm / min~80mm / min. Sampling and analysis of welded joints after welding, by figure 1 , figure 2 It can be seen that a macroscopically well-formed welded joint can be obtained ...

Example Embodiment

[0046] Example 2

[0047] The applied flux cored wire diameter is The welding wire powder accounts for 20% of the total mass of the flux cored wire, the flux core powder is 40Ti-20Mg-Al, and the aluminum skin of the welding wire is 7Si-Al, and the SiCp / 6061 composite material is welded. Before welding, put the flux-cored wire into a vacuum oven, keep it warm at 200°C for three hours, take it out of the oven after the wire is cooled, and use 180 # The base metal and flux-cored wire are sanded to remove the oxide film, and then cleaned with acetone. After drying the sample at 150°C, use Ar+25%N 2 As ion gas, the ion gas flow rate is 3L / min, with Ar as the shielding gas, the shielding gas flow rate is 9L / min, the welding current is 80A, the welding speed is 60mm / min, and the flux cored wire adding speed is 40mm / min~80mm / min. After welding, the welded joints were sampled and analyzed, and the results showed that: TiC, TiN, AlN, Al 3 Ti, MgAl 2 o 4 and Mg 3 N and other re...

Example Embodiment

[0048] Example 3

[0049] The applied flux cored wire diameter is The welding wire powder accounts for 20% of the total mass of the flux cored wire, the flux core powder is 40Ti-20Mg-5La-Al, and the aluminum skin of the wire is 7Si-Al, and the SiCp / 6061 composite material is welded. Before welding, put the flux-cored wire into a vacuum oven, keep it warm at 200°C for three hours, take it out of the oven after the wire is cooled, and use 180 # The base metal and flux-cored wire are sanded to remove the oxide film, and then cleaned with acetone. After drying the sample at 150°C, use Ar+25%N 2 As ion gas, the ion gas flow rate is 3L / min, with Ar as the shielding gas, the shielding gas flow rate is 9L / min, the welding current is 80A, the welding speed is 60mm / min, and the flux cored wire adding speed is 40mm / min~80mm / min. After welding, the welded joints were sampled and analyzed, and the results showed that: TiN, TiC, Ti 5 Si 3 , AlN, AlTi, Al 3 Reinforcing particles suc...

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Abstract

The invention relates to the field of novel welding materials, in particular to a flux cored wire for particle reinforced aluminum-based composite material fusion welding. The flux cored wire consists of an outer skin and core powder, wherein the outer skin is an aluminum foil which is prepared from aluminum silicon alloy; the mass of aluminum accounts for 85 to 95 percent of the total mass of the aluminum foil; the mass of silicon accounts for 5 to 15 percent of the total mass of the aluminum foil; the aluminum foil has thickness of between 0.15 and 0.55mm; the particle size of the core fluxpowder is 20nm to 200 mu m; the powder is prepared according to different proportions; the prepared powder is fully and uniformly mixed by applying a ball milling material mixer; the flux powder is held in the aluminum foil and coiled to form a cylindrical section; the flux powder is prepared into a soldering wire by rolling and drawing; and the diameter of the flux cored wire is 1.5 to 3.0mm. The flux cored wire is used for the fusion welding of the particle reinforced aluminum-based composite material; and the composition and the filling rate of the wrapped flux powder can be conveniently adjusted according to different welding requirements, so that the deposited metal can meet the requirements on mechanical property and process performance to the greatest extent.

Description

technical field [0001] The invention relates to the field of novel welding materials, in particular to a flux-cored welding wire used for fusion welding of particle-reinforced aluminum-based composite materials. Background technique [0002] The matrix of aluminum matrix composites is some metals with good plasticity and toughness, and its weldability is generally better; but the reinforcing phase is a non-metal with high strength, high elastic modulus, high melting point, and low linear expansion coefficient, and its weldability is very good. This feature makes it difficult to control the welding performance of aluminum matrix composites, thus hindering its industrial application. Fusion welding is the welding method with the strongest adaptability, the most mature technology and the widest application range among all welding methods. Therefore, the research direction of fusion welding of aluminum matrix composites has high research value. If a breakthrough is found in th...

Claims

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Application Information

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IPC IPC(8): B23K35/28B23K35/368
Inventor 雷玉成胡文祥薛厚禄陈希章
Owner JIANGSU UNIV
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