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Friction-stir welding technology

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, low welding coefficients, and inability to meet actual production needs.

Active Publication Date: 2019-04-05
广东和胜新能源科技有限公司
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  • Summary
  • 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

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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, preheat the aluminum alloy with natural gas, where 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℃ / s, and the surface temperature of the aluminum alloy after heating reaches 250℃;

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

[0060] (3) Fast cooling of the welding seam by the coolant, where the te...

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, preheat the aluminum alloy with natural gas, where 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℃ / s, and the surface temperature of the aluminum alloy after heating reaches 300℃;

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

[0066] (3) Fast cooling of the welding seam by the coolant, where the ...

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, preheat the aluminum alloy with natural gas, where 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℃ / s, and the surface temperature of the aluminum alloy after heating reaches 350℃;

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

[0072] (3) Fast cooling of the welding seam by the coolant, where the te...

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Abstract

The invention discloses a friction-stir welding technology. According to the friction-stir welding technology, two workpieces to be machined are heated, the surface temperature of the heated workpieces reach 200-400 DEG C, in this way, the plasticity of the workpieces is greatly improved, the workpieces have good metal fluidity in the friction-stir welding process, and solid-phase diffusion of theworkpieces is facilitated; then, friction-stir welding is conducted on the workpieces, the peak temperature of welded areas of the workpieces is controlled to be 390-490 DEG C, in this way, the temperature of the welded areas of the two workpieces is kept stable, and therefore the situation that the temperature of a weld seam area is excessively high, so that crystalline grains of the workpiecesrapidly grow and are over-burned is avoided; besides, a weld seam is rapidly cooled, the cooling speed of the weld seam is 70-250 DEG C / S, a welded joint is cooled at a high cooling speed, so that growth of the crystalline grains of the workpieces and coarsening of an aging strengthening phase of the workpieces can be restrained, the mechanical property loss generated after welding of the workpieces is reduced, and the welding coefficient of the weld seam is improved beneficially.

Description

Technical field [0001] The invention relates to the technical field of welding, in particular to a friction stir welding process. Background technique [0002] Friction stir welding is a solid-phase connection method that uses the heat generated by the friction between the high-speed rotating stirring head and the workpiece to locally plasticize the welded workpiece. When the stirring head moves forward along the welding interface, the plasticized material is stirred The rotating friction force of the head flows from the front to the back of the stirring head, and forms a dense solid-phase weld under the squeeze of the shaft shoulder. [0003] Usually in the friction stir welding process, the workpiece before welding is preheated; the welding process is performed after the preheating; after the workpiece is welded, the welded workpiece is cooled. However, in the actual friction stir welding process, the mechanical properties of the weld obtained are poor and the welding coefficien...

Claims

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Application Information

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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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