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Stirring device and system for improving strength of friction stir welding lap joint

A friction stir welding and lap joint technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc. It can become a crack source and other problems, and achieve the effect of increasing the effective connection width, improving the migration of the lap interface, and improving the mechanical properties of the joint.

Pending Publication Date: 2022-06-24
AEROSPACE ENG EQUIP SUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the shaft shoulders of the stirring tools used in friction stir welding are mostly flat or concave and concentric ring structures, and most of the stirring parts are tapered and threaded structures. When welding lap joints, due to the flow of plasticized materials in the vertical direction The lap joint interface at the edge of the weld is shifted upward or downward, resulting in a weak connection area similar to cracks, and the stress concentration is serious, which reduces the effective connection width and thickness of the lap joint, and at the same time, it is easy to become a crack when it is under load. source, leading to a decrease in the tensile and fatigue properties of the joint

Method used

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  • Stirring device and system for improving strength of friction stir welding lap joint
  • Stirring device and system for improving strength of friction stir welding lap joint
  • Stirring device and system for improving strength of friction stir welding lap joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] refer to Figure 1-5 As shown, the present invention provides a kind of embodiment that improves the stirring device of friction stir welding lap joint intensity, comprising:

[0037] The clamping assembly includes a clamping section 1, a transition zone 2, and a shoulder 3, wherein the clamping section 1 is connected to the shoulder 3 through the transition zone 2;

[0038] Stirrer 4 includes a stirring head and a cam toothed plate 41, wherein the stirring head is connected to the shaft shoulder 3, the cam toothed plate 41 is arranged on the stirring head, and the cam toothed plate 41 is provided with several cams 410 , the number of the cams 410 is 2-8, and each cam 410 is provided with a spiral oblique groove mirror-symmetrical to the radial horizontal center of the cam gear 41 .

[0039] Wherein, the materials of the clamping section 1, the transition zone 2, the shoulder 3 and the stirring member 4 include but not limited to tool steel, superalloy and ceramics; th...

Embodiment 2

[0052] refer to Figure 1-6 As shown, the present invention also provides an embodiment of a friction stir welding system for improving the strength of the lap joint, including the above-mentioned stirring device for improving the strength of the friction stir welding lap joint, and also includes:

[0053] The first plate body 5;

[0054] The second plate body 6 is attached to the first plate body 5;

[0055] Wherein, the stirring device passes through the first plate body 5 and is inserted into the second plate body 6 .

[0056] The length H of the stirrer 4 of the friction stir welding device is t 1 +0.5*h 2 ≤H≤t 1 +t 2 ;

[0057] The distance between the radial center of the stirring member 4 and the edge of the first plate body 5 is not less than The radial horizontal center of the cam gear plate 41 of the stirring device is at a height h from the shaft shoulder 3 1 is the thickness t of the first plate body 5 1 0.8-1.2 times.

Embodiment 3

[0059] refer to Figure 1-6 As shown, the present invention also provides an embodiment of the friction stir welding method, including the above-mentioned friction stir welding system for improving the strength of the lap joint, and the method includes:

[0060] Step S1: According to the thickness t of the first plate body 5 1 , the second plate body 6 thickness t 2 And the cam gear plate 41 thickness h 2 Calculate the length H of the required stirring member 4, and t 1 +0.5*h 2 ≤H≤t 1 +t 2 ;

[0061] Step S2: According to the diameter d of the shoulder 3 1 Set the distance between the center of the stirring member 4 and the edge of the first plate body 5, and not less than

[0062] Step S3: Generate welding parameters: set the rotating speed of the stirring member 4 to 200-5000r / min, the welding speed to 30-4000mm / min, the inclination angle to 0-3.5° and the welding press-in amount of the shoulder 3 to set 0.1-0.5mm;

[0063] Step S4: welding the workpiece to be w...

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Abstract

The invention discloses a stirring device and system for improving the strength of a friction stir welding lap joint, the stirring device comprises a clamping assembly, the clamping assembly comprises a clamping section, a transition area and a shaft shoulder, and the clamping section is connected with the shaft shoulder through the transition area; the stirring part comprises a stirring head and a cam fluted disc, the stirring head is connected with the shaft shoulder, the cam fluted disc is arranged on a truncated cone of the stirring head, the cam fluted disc is provided with a plurality of cams, each cam is provided with a spiral chute, the spiral chute comprises a first chute and a second chute, and the first chute is communicated with the second chute. And the extension lines of the first chute and the second chute are intersected. The stirring tool can increase the material flow of a lap joint interface, reduce the forward resistance during welding and prolong the service life of the stirring tool; lapping interface migration can be effectively improved, and the mechanical property of a joint is improved.

Description

technical field [0001] The invention relates to the technical field of friction welding, in particular to a stirring device and a system for improving the strength of friction stir welding lap joints. Background technique [0002] Friction Stir Welding (FSW for short) is a new solid-phase joining technology invented in 1991. Compared with traditional fusion welding, FSW is green, environmentally friendly, does not require shielding gas, does not require welding wire, and has no pores, cracks, and slag inclusions. And other defects, no arc, spatter, small deformation after welding, good weld shape and excellent mechanical properties, etc., very suitable for welding aluminum alloys, magnesium alloys, copper alloys, etc. [0003] At present, the shaft shoulders of the stirring tools used in friction stir welding are mostly flat or concave and concentric ring structures, and most of the stirring parts are tapered and threaded structures. When welding lap joints, due to the flow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
CPCB23K20/1255
Inventor 胡霞蒲炯李文晓徐萌徐晓霞范美华张磊呼家企窦国鹏
Owner AEROSPACE ENG EQUIP SUZHOU CO LTD