Aclinal stirring friction welding method for AZ31 magnesium alloy sheet and stirring head

A technology of friction stir and welding methods, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of low mechanical properties and deformation of welded joints, avoid tissue defects, reduce complexity, and increase friction surface Effect

Pending Publication Date: 2019-06-14
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low mechanical properties of the welded joint due to the thinning of the weld seam during friction stir welding of magnesium alloy sheets with an inclination angle, and the formation of air holes, cracks and

Method used

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  • Aclinal stirring friction welding method for AZ31 magnesium alloy sheet and stirring head
  • Aclinal stirring friction welding method for AZ31 magnesium alloy sheet and stirring head
  • Aclinal stirring friction welding method for AZ31 magnesium alloy sheet and stirring head

Examples

Experimental program
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Effect test

Example Embodiment

[0038] Example 1:

[0039] Step 1: Mechanically grind and polish the butt surface of the 1mm thick commercial AZ31 magnesium alloy rolled sheet to be welded, wash with acetone, absolute ethanol and deionized water in sequence, and dry quickly with a hair dryer;

[0040] Step 2: rigidly fix the AZ31 magnesium alloy dried in step (1) on the backing plate of the friction stir welding machine;

[0041] Step 3: Use a non-inclined friction stir welding stirring head to perform a single-pass non-inclined friction stir welding treatment on the butt surface of the AZ31 magnesium alloy to be welded;

[0042] The non-tilt friction stir welding mixing head used is shown in Figure 1-3 shown, including:

[0043] the clamping part 3, which is cylindrical;

[0044] The shaft shoulder 2 is in the shape of a truncated cone. The lower bottom surface of the shaft shoulder 2 is fixedly connected with the end face of the clamping portion 3 concentrically. , the edge of the upper bottom surface...

Example Embodiment

[0047] Example 2

[0048] Step 1: Mechanically grind and polish the butt surface of the 3mm thick commercial AZ31 magnesium alloy rolled sheet to be welded, wash with acetone, anhydrous ethanol and deionized water in sequence, and dry quickly with a hair dryer;

[0049] Step 2: rigidly fix the AZ31 magnesium alloy dried in step (1) on the backing plate of the friction stir welding machine;

[0050] Step 3: Use a non-inclined friction stir welding stirring head to perform a single-pass non-inclined friction stir welding treatment on the butt surface of the AZ31 magnesium alloy to be welded;

[0051] The non-tilt friction stir welding mixing head used is shown in Figure 1-3 shown, including:

[0052] the clamping part 3, which is cylindrical;

[0053] The shaft shoulder 2 is in the shape of a truncated cone. The lower bottom surface of the shaft shoulder 2 is fixedly connected to the end face of the clamping portion 3 concentrically. , the edge of the upper bottom surface o...

Example Embodiment

[0056] Example 3

[0057] Step 1: Mechanically grind and polish the butt surface of the 2mm thick commercial AZ31 magnesium alloy rolled sheet to be welded, wash with acetone, anhydrous ethanol and deionized water in sequence, and dry quickly with a hair dryer;

[0058] Step 2: rigidly fix the AZ31 magnesium alloy dried in step (1) on the backing plate of the friction stir welding machine;

[0059] Step 3: Use a non-inclined friction stir welding stirring head to perform a single-pass non-inclined friction stir welding treatment on the butt surface of the AZ31 magnesium alloy to be welded;

[0060] The non-tilt friction stir welding mixing head used is shown in Figure 1-3 shown, including:

[0061] the clamping part 3, which is cylindrical;

[0062] The shaft shoulder 2 is in the shape of a truncated cone. The lower bottom surface of the shaft shoulder 2 is fixedly connected with the end face of the clamping portion 3 concentrically. , the edge of the upper bottom surface...

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Abstract

The invention relates to an aclinal stirring friction welding method for an AZ31 magnesium alloy sheet and a stirring head; the method comprises the following steps of: firstly, mechanically polishinga butt jiont face to be welded of the AZ31 magnesium alloy, cleaning by acetone, absolute ethanol and deionized water successively, and then fixing the AZ31 magnesium alloy on the base plate of a stirring friction welding machine after being quickly dried; conducing a single pass aclinal stirring friction welding treatment to the butt joint face to be welded of the AZ31 magnesium alloy by the aclinal stirring friction welding stirring head, wherein the stirring head comprises a cylindrical clamping part, a round table shaft shoulder and round table stirring needle; the stirring head shaft shoulder is concave design, and three spiral grooves are uniformly distributed on the surface of the round table. The welding method and stirring head provided by the invention solve the problem that themechanical property of the welding joint is reduced due to the thinned weld seam when the magnesium alloy sheet is welded by the inclined stirring friction and the problem that the traditional welding method is easy to form pores, cracks and deformations in a weld zone. The welding joint obtained by the invention has beautiful appearance, and the maximum tensile strength of the joint can reach 97.8% of a base metal.

Description

technical field [0001] The invention relates to the field of friction stir welding of metal materials, in particular to a non-inclination friction stir welding method and a stirring head of an AZ31 magnesium alloy thin plate. Background technique [0002] Magnesium alloys are widely used in industries such as aerospace, rail transit, automobiles, and electronic products due to their low density, high specific strength and specific stiffness, good damping and vibration reduction, and electromagnetic fatigue performance. Magnesium alloy is also the preferred structural material for energy reduction, emission reduction and lightweight design. As a structural material application, welding processing is unavoidable. When traditional fusion welding technology is used to weld magnesium alloy sheets, due to the characteristics of magnesium alloys such as low melting point, strong chemical activity, large thermal expansion coefficient and thermal conductivity, it is easy to form por...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/24
Inventor 刘奋军姬妍白艳霞孙志勇李小腊
Owner YULIN UNIV
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