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A method for improving the wear resistance and high temperature resistance of a stirring head for friction stir welding

A technology of friction stir welding and stirring head, which is applied in the direction of coating, metal material coating process, etc., which can solve the problems affecting the reliability and stability of welded joints, poor workability of stirring head, and the maximum working temperature cannot reach titanium alloy welding Temperature and other issues

Inactive Publication Date: 2017-12-12
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above materials, the overall performance of tool steel is relatively good, but the maximum working temperature cannot reach the welding temperature of titanium alloy; while materials such as cemented carbide and cermet with relatively high working temperature, the machinability of the stirring head is relatively poor
In addition, it is difficult for a stirring head made of a single metal material to meet the requirements for wear resistance and high temperature thermal stability at the same time, and the wear resistance of metal materials is very limited, and the wear of the stirring head shoulder and stirring needle will inevitably Changes in mechanical force and frictional heat affect the reliability and stability of subsequent welded joints

Method used

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  • A method for improving the wear resistance and high temperature resistance of a stirring head for friction stir welding
  • A method for improving the wear resistance and high temperature resistance of a stirring head for friction stir welding

Examples

Experimental program
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Embodiment 1

[0061] According to the method of the present invention, the wear-resistant and high-temperature-resistant coating is prepared on the processed and manufactured stirring head concave shoulder and the tapered stirring needle substrate, and the weight percentage of the wear-resistant and high-temperature resistant coating raw material powder is 25% WC+1% La 2 o 3 +3.0%Al+3.5%Ti+0.8%Nb, the balance is Ni60, and its powder particle size is: -100~+200 mesh; La 2 o 3 The purity of rare earth oxides is 99.99%; nickel-based self-fluxing alloy Ni60, the mass percentage of its components is carbon 1.7%, silicon 4.5%, boron 3%, iron 3.5%, chromium 15%, and the balance is Ni; The filling method adopts the preset powder method to preset uniform nickel-based ceramic composite alloy powder with a thickness of 1mm on the surface of the concave shoulder of the stirring head; preset uniform nickel-based ceramic composite alloy powder with a thickness of 0.8mm on the surface of the conical stirri...

Embodiment 2

[0066] According to the method of the present invention, ring-shaped and spiral wear-resistant and high-temperature resistant coatings are prepared on the processed and manufactured stirring head concave shaft shoulder and the tapered stirring needle substrate, and the raw material powder formula and laser cladding process parameters of the wear-resistant and high-temperature resistant coating are the same as Embodiment 1 is the same. The difference from Example 1 is that the uniform nickel-based ceramic composite alloy powder with a thickness of 0.8-1.8 mm is preset on the surface of the concave shoulder of the stirring head by the method of preset powder; ~1.0mm uniform nickel-based ceramic composite alloy powder; using the same coating raw material formula and deposition process parameters as in Example 1 to prepare a coating different from Example 1 on the concave shoulder and conical stirring pin substrate with reasonable Annular and spiral wear-resistant and high-tempera...

Embodiment 3

[0070] According to the method of the present invention, ring-shaped and spiral wear-resistant and high-temperature resistant coatings are prepared on the processed and manufactured stirring head concave shoulder and the tapered stirring needle substrate. The raw material powder formula and preparation process of the wear-resistant and high-temperature resistant coating are all the same as those in the examples. Two same. The difference is that the rotation speed of the stirring head lower than the second embodiment is selected, and the higher welding speed is used to weld TC4 titanium alloy high-melting point materials, which are respectively 750r / min and 100mm / min, the rotation speed has decreased by 18.5%, and the welding speed has increased 30%. Compared with Example 1 and Example 2, the weld structure after welding shows that the grains of the weld structure are equiaxed, the degree of uniformity of the grains is greatly improved, and the refinement is remarkable. The sha...

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Abstract

A method to improve the wear resistance and high temperature resistance of the stirring head used for friction stir welding. The cast high-speed tool steel W18Cr4V is processed into the required concave shoulder and conical stirring needle shape stirring head by using free forging + die forging forging technology. Nickel-based ceramic composite alloy powder is preset on the surface of the stirring head shaft shoulder and the stirring needle substrate, and the surface layer of the shaft shoulder and the stirring needle substrate is heated and melted together with the pre-placed nickel-based ceramic composite alloy powder by laser cladding technology and rapidly condensed To prepare ring-shaped and spiral wear-resistant and high-temperature resistant coatings, the invention has simple process and low production cost. The mechanical structure of the stirring head shaft shoulder and the stirring needle is reasonable, and the coating prepared on the surface has high bonding strength, which can effectively improve the stirring head. The service life makes the stirring head have superior wear resistance and high temperature resistance.

Description

technical field [0001] The invention relates to the technical field of cladding coating, in particular to a method for improving the wear resistance and high temperature resistance performance of a stirring head used for friction stir welding. Background technique [0002] Friction Stir Welding (FSW for short) is an advanced solid-phase joining technology researched and invented by The Welding Institute (TWI for short) in 1991. Through the friction heat between the stirring needle and the shaft shoulder and the workpiece, a plastic softening layer is formed near the stirring needle, and the softening layer is filled into the cavity formed behind the stirring needle under the action of the high-speed rotation of the stirring head, so as to realize reliable connection . It has the advantages of high strength of welded joints, small deformation of welded workpieces, and no harmful effects. At present, the materials to be welded have gradually expanded from aluminum alloys to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/05B22F1/00
CPCB22F1/0003C22C19/058C23C24/106
Inventor 王洪铎王快社王文
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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