Stirring head for friction stir welding and fabrication method of stirring head

A friction stir welding and stirring head technology, applied in the field of powder metallurgy, can solve the problems of low production efficiency and unsuitable for industrialized production, etc.

Active Publication Date: 2019-12-17
安泰天龙钨钼科技有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method is simple in preparation process, the productio

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  • Stirring head for friction stir welding and fabrication method of stirring head

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preparation example Construction

[0038] According to an embodiment of the present invention, a method for preparing a friction stir welding stirring head is provided, comprising the following steps:

[0039] A. Preparation of matrix alloy powder:

[0040]Prepare raw materials, according to mass percentage, the raw materials include: tungsten powder 55-85%, rhenium powder 5-15%, zirconium carbide and / or hafnium carbide powder 10-30%, tungsten powder and rhenium powder have a Fischer particle size of 2.0 ~5.0μm, the particle size of zirconium carbide and / or hafnium carbide powder is -150~-400 mesh, the purity of tungsten powder, rhenium powder and zirconium carbide and / or hafnium carbide powder are all greater than 99.5%. Mixing, the mixing machine is a three-dimensional or double-motion mixing machine, the mixing time is 3 to 10 hours, and the matrix alloy powder is obtained after the mixing is completed. Preferably, in terms of mass percentage, the raw materials include: 55-67% of tungsten powder, 5-15% of r...

Embodiment 1

[0057] Including the following steps:

[0058] A. Preparation of matrix alloy powder:

[0059] Prepare raw materials, according to mass percentage, the raw materials include: tungsten powder 70%, rhenium powder 10%, zirconium carbide powder 20%, the Fischer particle size of tungsten powder and rhenium powder are both 3.0 μm, and the particle size of zirconium carbide powder is -300 mesh The purity of tungsten powder, rhenium powder and zirconium carbide powder is greater than 99.5%. The raw materials are mixed by a three-dimensional mixer. The mixing time is 4 hours, and the matrix alloy powder is obtained after the mixing is completed.

[0060] B. Compression forming:

[0061] The matrix alloy powder obtained after step A is put into the cavity of the mold for compression forming treatment to obtain a formed billet. The forming pressure of the press forming treatment is 150MPa, and the holding time is 5s;

[0062] C. High temperature sintering:

[0063] Using a hydrogen a...

Embodiment 2

[0070] A. Preparation of matrix alloy powder:

[0071] Prepare raw materials, according to mass percentage, the raw materials include: tungsten powder 65%, rhenium powder 5%, hafnium carbide powder 30%, the Fischer particle size of tungsten powder and rhenium powder are both 2.5 μm, and the particle size of hafnium carbide powder is -200 mesh , the purity of tungsten powder, rhenium powder and hafnium carbide powder is greater than 99.5%. The raw materials are mixed with a double-motion mixer. The mixing time is 6 hours. After the mixing is completed, the matrix alloy powder is obtained.

[0072] B. Compression forming:

[0073] The matrix alloy powder obtained after step A is put into the cavity of the mold for compression forming treatment to obtain a formed billet. The forming pressure of the press forming treatment is 200MPa, and the holding time is 10s;

[0074] C. High temperature sintering:

[0075] Sinter the formed billet obtained in step B by using a hydrogen atmo...

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Abstract

The invention provides a stirring head for friction stir welding and a fabrication method of the stirring head. The stirring head for friction stir welding comprises the following raw materials basedon percent by mass: 55-85% of tungsten powder, 5-15% of rhenium powder and 10-30% of zirconium carbide and/or hafnium carbide powder. The fabrication method of the stirring head for friction stir welding comprises the following steps of A, preparing matrix alloy powder; B conducting pressing and forming, specifically conducting pressing and forming on the matrix alloy powder obtained in the step Ato obtain a formed blank; C, performing high-temperature sintering, specifically sintering the formed blank in the step B to obtain a sintered blank; and D, performing hot isostatic pressure processing. By introducing elements such as rhenium, zirconium carbide and/or hafnium carbide into a tungsten matrix, the plasticity and the processability can be remarkably improved, and the zirconium carbide and/or hafnium carbide is distributed in the tungsten matrix in a diffusion way so as to achieve an effect of fine-grain strengthening; and meanwhile, a W-C chemical bond can be formed at an interface bonding position, so that the enhancement effect can be further improved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a friction stir welding stirring head and a preparation method thereof. Background technique [0002] Friction stir welding (FSW: Friction Stir Welding), as a new type of material joining technology, has the advantages of good weld quality consistency, high weld strength, small residual stress and residual deformation in the weld zone, etc., and has been used in aerospace, Vehicles, shipbuilding and other industries are widely used. As the "heart" of friction stir welding, the stirring head is the key to the friction stir welding technology. Its quality determines the performance of the friction stir welding head, the type of material to be welded, the thickness range of the material to be welded, and also determines the stirring Production costs of friction welding. In the friction stir welding process, the stirring head should be rotated and inserted into the bondin...

Claims

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Application Information

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IPC IPC(8): B23K20/12B22F1/00B22F3/02B22F3/15C22C27/04C22C32/00
CPCB22F1/0003B23K20/1255C22C27/04C22C32/0052B22F3/02B22F3/15B22F2998/10
Inventor 董帝熊宁刘国辉王承阳常洋康聚磊
Owner 安泰天龙钨钼科技有限公司
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