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A method for eliminating peeling defects on the surface of magnesium-lithium alloy friction stir welding seam

A technology for friction stir welding and magnesium-lithium alloys, applied in the fields of friction stir welding and magnesium-lithium alloy friction stir welding, it can solve the problems affecting the beauty of welds, joint performance and quality, eliminate peeling defects, promote industrial application, The effect of efficient FSW

Active Publication Date: 2021-03-16
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the prior art, the present invention proposes a method for eliminating the peeling defects on the surface of the friction stir welding seam of the magnesium-lithium alloy. Skin defects, which seriously affect the appearance of welds, joint performance and quality, can eliminate the skin defects that are prone to appear at the starting end of magnesium-lithium alloy friction stir welding, and obtain beautifully formed magnesium-lithium alloy FSW joints, which are very important for improving magnesium-lithium alloys. The quality and performance of FSW joints are of great significance to promote the industrial application of magnesium-lithium alloy FSW

Method used

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  • A method for eliminating peeling defects on the surface of magnesium-lithium alloy friction stir welding seam
  • A method for eliminating peeling defects on the surface of magnesium-lithium alloy friction stir welding seam
  • A method for eliminating peeling defects on the surface of magnesium-lithium alloy friction stir welding seam

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Effect test

Embodiment 1

[0046] A method for eliminating peeling defects on the surface of friction stir welding of magnesium-lithium alloys. The FSW stage diagram is shown in figure 1 , including the following steps:

[0047] Step 1: Determine the shortest time T Min

[0048] (1) Take one from the LZ91 magnesium-lithium alloy plate with a thickness of 4 mm to be welded as a magnesium-lithium alloy reference piece; according to the LZ91 magnesium-lithium alloy plate with a thickness of 4 mm to be welded, the diameter of the stirring head shaft shoulder is 18mm, the length of the conical stirring needle is 3.7mm, fix the magnesium-lithium alloy reference piece and stirring head in the corresponding position of the friction stir welding machine, move the stirring head to the top of the magnesium-lithium alloy reference piece to be welded, and determine the welding position. Complete the positioning of the stirring head;

[0049] (2) Press the stirring head into the magnesium-lithium alloy reference p...

Embodiment 2

[0065] By adopting the method for eliminating the peeling defect on the surface of the friction stir welding seam of the magnesium-lithium alloy of the present invention, the LA141 magnesium-lithium alloy is subjected to FSW.

[0066] Select an LA141 magnesium-lithium alloy plate with a thickness of 4mm to be welded for FSW. According to the diameter of the stirring head shoulder is 10mm and the length of the conical stirring needle is 3.7mm, the LA141 magnesium-lithium alloy plate to be welded and the stirring head are fixed on the stirring head. At the corresponding position of the friction welding machine, move the stirring head to the top of the LA141 magnesium-lithium alloy plate to be welded, determine the welding position, and complete the positioning of the stirring head; then the stirring head is pressed into the welded LA141 magnesium-lithium alloy at a speed of 400r / min In the plate, the downward pressure of the shaft shoulder is 0.2mm; the pressure is maintained at ...

Embodiment 3

[0068] By adopting the method for eliminating the peeling defect on the surface of the friction stir welding seam of the magnesium-lithium alloy of the present invention, FSW is performed on the LA91 magnesium-lithium alloy.

[0069] Select a LA91 magnesium-lithium alloy plate with a thickness of 6mm to be welded for FSW. According to the diameter of the shoulder of the stirring head is 24mm and the length of the conical stirring needle is 5.4mm, fix the LA91 magnesium-lithium alloy plate to be welded and the stirring head on the stirring head. At the corresponding position of the friction welding machine, move the stirring head to the top of the LA91 magnesium-lithium alloy plate to be welded, determine the welding position, and complete the positioning of the stirring head; then the stirring head is pressed into the welded LA91 magnesium-lithium alloy at a speed of 800r / min In the plate, the downward pressure of the shaft shoulder is 0.25mm; the pressure is maintained at 800r...

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Abstract

The invention discloses a method for eliminating a welding seam surface peeling defect of magnesium-lithium alloy friction-stir welding, and belongs to the field of friction-stir welding. The method includes stirring head positioning, stirring head rotating downward pressing, pressure holding and welding processes. In the pressure holding and welding processes, a thermodynamic balance maintenanceprocess is added. The method concretely has the following step: according to distance of the welding seam surface peeling defect of a reference piece of the magnesium-lithium alloy friction-stir welding, determining shortest time that welding seam surface metal can stably detach from the edge of a shaft shoulder at an initial stage of the magnesium-lithium alloy friction-stir welding, thereby determining thermodynamic balance maintenance time. The method solves the problem that conventional FSW technology is prone to the peeling defect at a starting end of magnesium-lithium alloy FSW, which seriously affects weld appearance and joint performance and quality, and has important significance for improving the quality and performance of a magnesium-lithium alloy FSW joint and promoting the industrial application of the magnesium-lithium alloy FSW.

Description

technical field [0001] The invention relates to the field of friction stir welding, in particular to the technical field of magnesium-lithium alloy friction stir welding, and in particular to a method for eliminating peeling defects on the surface of a magnesium-lithium alloy friction stir welding seam. Background technique [0002] Magnesium-lithium alloy is currently the lightest metal structural material that can be applied in engineering, and has good thermal conductivity, electrical conductivity and ductility, and is widely used in aerospace, national defense and military industries. The technology will play an irreplaceable key role in the engineering application of magnesium-lithium alloys. [0003] Friction Stir Welding (FSW), as a solid-phase joining technology, can avoid metallurgical defects such as pores and slag inclusions in fusion welding, and has been widely used in the field of welding of magnesium alloys such as AZ series and ZK series. , and achieved the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/1235B23K20/24
Inventor 徐荣正李慧侯艳喜国旭明
Owner SHENYANG AEROSPACE UNIVERSITY