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Friction stir welding stirring head material and stirring head preparation method

A technology of friction stir welding and stirring head, which is applied in the field of friction stir welding stirring head material and preparation of the stirring head, alloy friction stir welding technology, and can solve the problems of low mechanical properties, short service life and high production cost of the stirring head, and achieve Effects of shortening sintering time, increasing service life, and reducing raw material costs

Active Publication Date: 2018-10-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a friction stir welding stirring head material to solve the problems of low mechanical properties, short service life and high production cost of the existing stirring head

Method used

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  • Friction stir welding stirring head material and stirring head preparation method
  • Friction stir welding stirring head material and stirring head preparation method
  • Friction stir welding stirring head material and stirring head preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] According to the method of the present invention, raw material adopts 80% tungsten powder and 20% titanium carbide powder (80%W+20%TiC), wherein, the purity of two kinds of powders is 99.99%, the particle size of tungsten powder is 8 μm, titanium carbide The particle size of the powder is 8 μm; mix the above alloy powder evenly and put it into the stirring head mold prepared in advance, and put it into the sintering furnace after compaction for hot pressing sintering. The process steps and parameters are as follows: 1) Raise the temperature of the furnace To 2000°C, apply a pressure of 20MPa, and keep warm for 1h; 2) After the sintering furnace is naturally cooled to room temperature, take out the stirring head for fine polishing.

Embodiment 2

[0030] According to the method of the present invention, raw material adopts 80% tungsten powder and 20% zirconium carbide powder (80%W+20%ZrC), wherein, the purity of two kinds of powders is 99.99%, the particle size of tungsten powder is 8 μm, zirconium carbide The particle size of the powder is 8 μm; mix the above alloy powder evenly and put it into the stirring head mold prepared in advance, and put it into the sintering furnace after compaction for hot pressing sintering. The process steps and parameters are as follows: 1) Raise the temperature of the furnace To 2000°C, apply a pressure of 20MPa, and keep warm for 1h; 2) After the sintering furnace is naturally cooled to room temperature, take out the stirring head for fine polishing.

Embodiment 3

[0032] According to the method of the present invention, the raw material is 80% tungsten powder plus 10% titanium carbide powder and 10% zirconium carbide powder (80%W+10%TiC+10%ZrC), wherein the purity of the two powders is 99.99%. The particle size of the tungsten powder is 8 μm, the particle size of the titanium carbide powder and zirconium carbide powder is 8 μm; mix the above alloy powder evenly and put it into the mixing head mold made in advance, press it and put it into the sintering furnace for sintering. The process steps and parameters are as follows: 1) Gradually raise the furnace temperature to 2000°C, apply a pressure of 20 MPa, and keep it for 1 hour; 2) After the sintering furnace is naturally cooled to room temperature, take out the stirring head for fine polishing.

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Abstract

The invention discloses a friction stir welding stirring head material and a stirring head preparation method and belongs to the technical field of preparation of stirring head for welding. The friction stir welding stirring head material comprises the following components in percentage by weight: 75%-85% of tungsten powder and 15%-25% of carbon alloyed powder. The carbon alloyed powder is one andor combination of two selected from titanium carbide powder and zirconium carbide powder. The stirring head preparation method comprises the following steps: 1, according to the matching, mixing tungsten powder with carbon alloyed powder to form a mixture, and placing the mixture in a stirring head die for preforming treatment to prepare a preform body; and 2, placing the preform body in a furnace, rising the temperature to 2000-2200 DEG C along with the furnace, adjusting the pressure in the furnace to be 20-25 MPa, keeping the temperature for 1-1.5 hours, and naturally cooling along with the furnace to obtain the stirring head. The stirring head has high strength and wear resistance, the service life of the stirring head can be remarkably prolonged, the adopted alloy powder can be obtained easily, and the raw material cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of welding stirring head preparation, in particular to a friction stir welding stirring head material and a preparation method of the stirring head, which are mainly used in friction stir welding processes of alloys such as aluminum alloys, magnesium alloys, copper alloys, and titanium alloys. Background technique [0002] Friction stir welding technology, with its unique working principle and technical characteristics, has become a new star and research hotspot in the field of welding. Friction stir welding does not require welding wire, electrode and shielding gas, and is a green and environmentally friendly welding technology. Stirring head is its most important consumable, but it is also the most fatal weakness of friction stir welding; the quality of stirring head not only determines the performance of friction stir welding joint, but also determines the production cost of friction stir welding. During...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C32/00B22F1/00B22F3/14B23K20/12
CPCB22F1/0003B22F3/14B22F2003/145B22F2998/10B23K20/1255C22C27/04C22C32/0052B22F3/02
Inventor 李达张乔范兴文王松
Owner SOUTHWEST JIAOTONG UNIV
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