Friction Stir Welding Process

A friction stir and welding technology, applied in welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve problems such as poor mechanical properties of welds, inability to meet actual production needs, and low welding coefficients.

Active Publication Date: 2021-12-21
广东和胜新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual friction stir welding process, the mechanical properties of the obtained weld are poor, and the welding coefficient is low. Among them, the mechanical properties include tensile strength, yield strength and elongation; the welding coefficient is the strength of the welded joint and the strength of the base metal. The ratio of welding coefficient includes welding coefficient of tensile strength, welding coefficient of yield strength and welding coefficient of elongation
The welding coefficient of the yield strength and the welding system of the tensile strength of the actual obtained weld are only about 0.65, and the welding coefficient of the elongation is only about 0.4, which is far from meeting the actual production needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The workpiece processed in this embodiment is 7055-T6 ultra-high-strength aluminum alloy with a width of 200 mm, a thickness of 5 mm, and a length of 1000 mm. The specific friction stir welding process steps are as follows:

[0058] (1) Before friction stir welding, the aluminum alloy is preheated by natural gas, wherein the flow rate of natural gas is 1m 3 / h, the height of the natural gas nozzle from the surface of the aluminum alloy is 40mm; at this time, the heating rate of the aluminum alloy is 30°C / s, and the surface temperature of the aluminum alloy reaches 250°C after heating;

[0059] (2) The two aluminum alloys are then welded by a friction stir welding device. The rotation speed of the stirring head is 800rpm, the moving speed of the stirring head is 60mm / min, and the shoulder is pressed into the surface of the aluminum alloy by 0.5mm. At this time, the peak value of the welding area is The temperature is 415°C;

[0060] (3) Rapid cooling of the weld seam b...

Embodiment 2

[0063] The workpiece processed in this embodiment is 7055-T6 ultra-high-strength aluminum alloy with a width of 200 mm, a thickness of 5 mm, and a length of 1000 mm. The specific friction stir welding process steps are as follows:

[0064] (1) Before friction stir welding, the aluminum alloy is preheated by natural gas, wherein the flow rate of natural gas is 2.5m 3 / h, the height of the natural gas nozzle from the surface of the aluminum alloy is 40mm; at this time, the heating rate of the aluminum alloy is 40°C / s, and the surface temperature of the aluminum alloy reaches 300°C after heating;

[0065] (2) The two aluminum alloys are then welded by a friction stir welding device. The rotation speed of the stirring head is 800rpm, the moving speed of the stirring head is 60mm / min, and the shoulder is pressed into the surface of the aluminum alloy by 0.5mm. At this time, the peak value of the welding area is The temperature is 465°C;

[0066] (3) Rapid cooling of the weld seam...

Embodiment 3

[0069] The workpiece processed in this embodiment is 7055-T6 ultra-high-strength aluminum alloy with a width of 200 mm, a thickness of 5 mm, and a length of 1000 mm. The specific friction stir welding process steps are as follows:

[0070] (1) Before friction stir welding, the aluminum alloy is preheated by natural gas, wherein the flow rate of natural gas is 4m 3 / h, the height of the natural gas nozzle from the surface of the aluminum alloy is 40mm; at this time, the heating rate of the aluminum alloy is 45°C / s, and the surface temperature of the aluminum alloy reaches 350°C after heating;

[0071] (2) The two aluminum alloys are then welded by a friction stir welding device. The rotation speed of the stirring head is 800rpm, the moving speed of the stirring head is 60mm / min, and the shoulder is pressed into the surface of the aluminum alloy by 0.5mm. At this time, the peak value of the welding area is The temperature is 465°C;

[0072] (3) Rapid cooling of the weld seam b...

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Abstract

The invention discloses a friction stirring welding process, which heats two workpieces to be processed so that the surface temperature of the heated workpieces is 200°C to 400°C. In this way, the plasticity of the workpiece is greatly improved, so that the workpiece has good metal fluidity during the friction stir welding process, which is beneficial to the solid phase diffusion of the workpiece. Next, friction stir welding is performed on the workpiece, and the peak temperature of the welding area of ​​the workpiece is controlled to be 390 ° C ~ 490 ° C, so that the temperature of the welding area of ​​the two workpieces remains stable, preventing the temperature of the welding joint area from being too high, causing the workpiece to be damaged. The grains grow rapidly and overburn. And rapidly cool the weld seam, the cooling speed of the weld seam is 70°C / S~250°C / S. In this way, the high cooling rate is used to cool the welded joint, which can inhibit the growth of the grain of the workpiece and the coarsening of the aging-strengthened phase, reduce the loss of the mechanical properties of the workpiece after welding, and help to improve the welding coefficient of the weld.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a friction stir welding process. Background technique [0002] Friction stir welding is a solid-phase joining method. The heat generated by the friction between the high-speed rotating stirring head and the workpiece is used to locally plasticize the welded workpiece. When the stirring head moves forward along the welding interface, the plasticized material is stirred. Under the action of the rotating friction of the mixing head, the flow flows from the front to the rear of the stirring head, and forms a dense solid-phase weld under the extrusion of the shaft shoulder. [0003] Usually, in the friction stir welding process, the workpiece before welding is preheated; after preheating, the welding process is performed; after the workpiece is welded, the welded workpiece is cooled. However, in the actual friction stir welding process, the mechanical properties of the obtained weld...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
CPCB23K20/1235
Inventor 李承波宾建存周旺刘胜胆李建湘邓运来
Owner 广东和胜新能源科技有限公司
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