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Welding method for friction stir welding of aluminum alloy narrow step lap joint

A technology of friction stir welding and welding method, which is applied in the direction of welding equipment, non-electric welding equipment, metal processing equipment, etc., and can solve the problems of friction stir welding patents and articles without narrow lap joints, reduced cooling efficiency of cold plates, and reduced cooling channels Area and other issues, to achieve the effect of improving the cooling efficiency of the cold plate, improving the cooling efficiency, and improving the design efficiency

Inactive Publication Date: 2018-08-24
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing domestic and foreign stirring heads need to have a width-to-depth ratio greater than 1 (step width ≥ weld depth,) when performing lap welding. When the step is too narrow, the weld will collapse, which makes friction stir welding overlap in the design The width of the lap joint must be increased to meet the requirements of friction stir welding, and increasing the lap width will increase the width of the cold plate or reduce the area of ​​the cooling channel, reducing the cooling efficiency of the cold plate
Therefore, if the cooling efficiency of the cold plate is to be improved, it is necessary to realize the friction stir welding technology of narrow lap joints of aluminum alloy. At present, there are no patents and articles on friction stir welding of narrow lap joints at home and abroad

Method used

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  • Welding method for friction stir welding of aluminum alloy narrow step lap joint
  • Welding method for friction stir welding of aluminum alloy narrow step lap joint
  • Welding method for friction stir welding of aluminum alloy narrow step lap joint

Examples

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Effect test

Embodiment 1

[0026] Example 1, when the welding depth is 4mm, the length of the stirring needle is 4mm, right-handed, the diameter of the tip of the stirring needle is 2.8mm, the diameter of the root of the stirring needle is 4.4mm, the width of the shoulder is 10mm, and the shoulder is concentric. The concave depth is 0.6mm, which is suitable for welding with a welding depth of 4mm and a narrow step lap of aluminum alloy cold plate structure with a step not less than 2mm. The material of the cold plate is T6 state Al-Mg-Si series heat-treatable aluminum alloy. It is: remove the oxide film on the surface of the weld by acid and alkali cleaning before welding, and confirm that there is no burr, no damage, no metal chips and oil on the surface of the weld, the rotation speed of the rotary head is 1200-1500r / min, and the welding speed is 100-120mm / min, the inclination angle of the stirring head is 2.5°, and the friction welding is carried out to make the weld without defects, such as figure...

Embodiment 2

[0027] Example 2, when the welding depth is 5mm, the length of the stirring needle is 5mm, right-handed, the diameter of the tip of the stirring needle is 3.2mm, the diameter of the root of the stirring needle is 5.4mm; the width of the shoulder is 12mm, and the shoulder is concentric and concave The depth is 0.6mm, which is suitable for welding with a welding depth of 5mm and a narrow step of not less than 3mm to lap the aluminum alloy cold plate structure. The material of the cold plate is T6 state Al-Mg-Si series heat-treatable aluminum alloy. The welding steps are: : Remove the oxide film on the surface of the weld by acid and alkali cleaning before welding, confirm that the surface of the weld is free of burrs, damage, metal shavings and oil, the rotation speed of the stirring head is 1000-1200r / min, and the welding speed is 100-120mm / min , the inclination angle of the stirring head is 2.5°, and the friction welding is carried out to make the weld without defects, such as ...

Embodiment 3

[0028] Example 3, when the welding depth is 6mm, the length of the stirring needle is 6mm, right-handed, the diameter of the tip of the stirring needle is 3.4mm, the diameter of the root of the stirring needle is 6.5mm, the width of the shoulder is 12mm, the shoulder is concentric and concave The depth is 0.63mm, which is suitable for welding aluminum alloy cold plate structures with narrow steps with a welding depth of 6mm and a step not less than 4mm. No burrs, no damage, no metal shavings and oil stains, the rotation speed of the stirring head is 600-800r / min, the welding speed is 80-100mm / min, the inclination angle of the stirring head is 2.5°, and the friction welding is carried out so that the weld seam has no defects. Such as Figure 4 shown.

[0029] The beneficial effect of the present invention is: adopt narrow step lap joint (the step width is obviously smaller than the weld seam depth) friction stir welding stirring head, research and develop new narrow lap joint ...

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Abstract

The invention discloses a welding method for friction stir welding of aluminum alloy narrow step lap joint. The welding method comprises a stir-welding head body, the stir-welding head body comprisesa stir needle and a shaft shoulder, the upper portion of the stir needle is provided with a stir needle point, the stir needle is of a trapezoidal structure, the bottom of the stir needle is providedwith the shaft shoulder, the shaft shoulder is of a concentric circle type, and the height of the stir needle is the same as the depth of welding and is 4 mm, 5 mm or 6 mm correspondingly. The weldingmethod for friction stir welding of aluminum alloy narrow step lap joint has the beneficial effects that a friction stir welding stir-welding head of narrow step lap joint (the step width is obviously less than weld joint depth) is adopted, the novel narrow lap joint friction stir welding process method is developed, friction stir welding of aluminum alloy narrow step lap joint is realized, the cooling efficiency of friction stir welding cold plate structures is improved, the fluidity of materials in the welding process is increased, the welding pressure and stir-welding head shaft shoulder width are reduced, the welding structure design efficiency is improved remarkably, the space utilization rate and cooling efficiency of cold plates are improved, and the applicability of friction stirwelding for aluminum alloy is improved.

Description

technical field [0001] The invention relates to a welding method of aluminum alloy narrow step lap joint friction stir welding. Background technique [0002] Due to its superior thermal conductivity and mechanical properties, aluminum alloy cold plate structures are widely used in aerospace and electronic technology and other fields. The main form of welding joints of cold plate structures is lap joints, which are welded by step support welds. Due to the superior light metal welding performance of friction stir welding, aluminum alloy cold plate friction stir welding technology is widely used. [0003] Narrow step overlap means that the width-to-depth ratio of the weld (step width / weld depth) is less than 1, and the step width is significantly smaller than the weld depth. During the friction stir welding process, heat is generated by the friction between the stirring pin and the stirring head shoulder and the base metal. Since the shoulder exerts pressure on the joint durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/12B23K20/1255B23K20/24
Inventor 王涛冯杏梅冯展鹰郭晓娟
Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
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