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Friction stir welding method of medium plate AZ AZ1 magnesium alloy

A technology of friction stir and welding methods, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of immature welding process, etc., and achieve the effect of beautiful shape, good welding and good fusion

Inactive Publication Date: 2010-11-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defect that the current medium and thick plate magnesium alloy welding process is not yet mature, the invention provides a friction stir welding method for medium and thick plate AZ31 magnesium alloy

Method used

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  • Friction stir welding method of medium plate AZ AZ1 magnesium alloy
  • Friction stir welding method of medium plate AZ AZ1 magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Friction stir welding of 10 mm thick AZ31 magnesium alloy sheets. Butt the two 10mm thick AZ31 magnesium alloy plates to be welded, rigidly fix them on the back pad, select the welding process parameters: the diameter of the stirring head shaft shoulder is 28mm, the root diameter of the stirring needle is 10.3mm, and the diameter of the stirring needle end is 7.8mm mm, the length of the stirring needle is 9.6mm; the welding inclination angle of the stirring head is 2.5°, the downward pressure is 0.1mm, the rotation speed is 800r / min, and the welding speed is 200mm / min. During welding, the stirring head rotates at high speed and presses into the workpiece along the butt surface of the workpiece until the shaft shoulder of the stirring head is in close contact with the workpiece; Stirring is aimed at the stirring and friction of the workpiece, causing the material in front of the stirring head to undergo strong plastic deformation. With the movement of the stirring head, ...

Embodiment 2

[0013] Friction stir welding of 10 mm thick AZ31 magnesium alloy sheets. Butt the two 10mm thick AZ31 magnesium alloy plates to be welded, rigidly fix them on the back pad, select the welding process parameters: the diameter of the stirring head shaft shoulder is 28mm, the root diameter of the stirring needle is 10.3mm, and the diameter of the stirring needle end is 7.8mm, the length of the stirring needle is 9.6mm; the welding inclination angle of the stirring head is 2.5°, the pressing amount is 0.1mm, the rotation speed is 800r / min, and the welding speed is 100mm / min. During welding, the stirring head rotates at high speed and presses into the workpiece along the butt surface of the workpiece until the shaft shoulder of the stirring head is in close contact with the workpiece; Stirring is aimed at the stirring and friction of the workpiece, causing the material in front of the stirring head to undergo strong plastic deformation. With the movement of the stirring head, the h...

Embodiment 3

[0015] Friction stir welding of 20mm thick AZ31 magnesium alloy sheets. Butt the two 20mm thick AZ31 magnesium alloy plates to be welded, rigidly fix them on the back pad, select the welding process parameters: the diameter of the shoulder of the stirring head is 35mm, the diameter of the root of the stirring needle is 15.1mm, and the diameter of the end of the stirring needle is 9.3mm mm, the length of the stirring needle is 19.5mm; the welding inclination angle of the stirring head is 3°, the downward pressure is 0.2mm, the rotation speed is 1100r / min, and the welding speed is 150mm / min. During welding, the stirring head rotates at a high speed and the butt surface of the workpiece is pressed into the workpiece until the shoulder of the stirring head is in close contact with the workpiece; Stirring is aimed at the stirring and friction of the workpiece, causing the material in front of the stirring head to undergo strong plastic deformation. With the movement of the stirring...

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Abstract

The invention relates to a friction stir welding method of a medium plate AZ AZ1 magnesium alloy, belongs to the technical field of welding process used in material processing projects, and particularly provides a friction stir welding method of a 10 to 20-millimeter-thick AZ31 magnesium alloy. The welding inclined angle of a stirring head is 2.5 to 3 DEG, the pressing depth is 0.1 to 0.2 millimeter, the rotation speed is 600 to 1,400r / min, and the welding speed is 100 to 200 mm / min; the shaft shoulder of the stirring head is concave and a stirring pin is frustum-shaped and spiral; the diameter of the shaft shoulder of the stirring head is 28 to 35 millimeters; the diameter of the root part of the stirring pin is 10.3 to 15.1 millimeters, and the diameter of the end part of the stirring pin is 7.8 to 9.3 millimeters; and the length of the stirring pin is 9.6 to 19.5 millimeter. By selecting reasonable welding parameters, the obtained joint is formed elegantly, the maximum tensile strength is up to 94.7 percent of that of a parent metal, and the well welding of the medium plate AZ AZ1 magnesium alloy.

Description

technical field [0001] The invention relates to a friction stir welding method for a medium-thick plate AZ31 magnesium alloy, and belongs to the technical field of material processing engineering welding technology. Background technique [0002] Magnesium alloys have the characteristics of low melting point, large thermal conductivity and thermal expansion coefficient, and strong chemical activity. In the ordinary melting welding process, problems such as slag inclusions, pores, deformation, cracks, and overheating are prone to occur, which seriously hinders the application of its welded structural parts. . Many research institutes and universities at home and abroad have carried out research on the welding method of magnesium alloys, but it is limited to the research on the welding method of thin-plate magnesium alloys less than or equal to 10mm thick. There are few studies. With the application of high-strength magnesium alloys in light armor, the welding and forming of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/233
Inventor 杨素媛李树奎程兴旺袁剑钟红然
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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